Loading...
CJCU

Table of Content

    24 January 1995, Volume 16 Issue 1
    Previous Issue    Next Issue
    Articles
    Studies on Amphiphilic Rare Earth Complexes with Hemicyanine
    WANG Ke-Zhi, WU Nian-Zhu, HUANG Chun-Hui, XU Guang-Xian, XU Yu, LIU Yun-Qi, ZHU Dao-Ben, LIU Li-Ying, WANG Wen-Cheng
    1995, 16(1):  1-4. 
    Asbtract ( )   PDF (307KB) ( )  
    Related Articles | Metrics
    Four novel rare earth coordination compounds,(E)-hexadecyl-4-(2,4-dimethylaminophenyl)ethenyl pyridinium tetrakis-(1-phenyl-3-methyl-4-benzoylpyrazolonato)lanthanide(Ⅲ)(La, Nd, Dy, Yb) have been synthesized and characterized by elementary analysis, UV-Vis, IR,1HNMR,TG-DTA analysis,X-ray photoelectron specroscopy,X-ray powder diffraction and molar conductivity. The comparison of the surface pressure-area isotherms of the complexes with that of hemicyanine, bromide is made. The better Langmuir film-forming properties of the metal complexes are obtained. Preliminary result of second harmonic generation (SHG) from monolayer film of the dysprosium complex is reported.
    Synthesis and Properties of α-Molybadotungstoniobic Diphosphates
    OU Lun-Yu, GONG Jian, PENG Jun, SUN Shao-Ren, ZHANG Jian-Guo
    1995, 16(1):  5-8. 
    Asbtract ( )   PDF (301KB) ( )  
    Related Articles | Metrics
    Four kinds of new molybdotungstoniobic diphosphates with the Dawson structure, formulated as α-P2W15Mo2NbO , are prepared and characterized by IR, UVspectra,polarography and 183WNMR which show that the same "polar" Watoms in the Dawson frames are substituted. The mean value of 183W chemical shifts of the "polar" group varies linearly with the number of substituted atoms in the opposite polar group.
    Luminescent Centres o Eu2+in BaMgAl10O17Phosphor
    LIU Ying-Liang, LI Yuan-Ying, YANG Yan-Sheng, SHI Chun-Shan
    1995, 16(1):  9-12. 
    Asbtract ( )   PDF (297KB) ( )  
    Related Articles | Metrics
    Influence of flux on luminescence of Eu2+in phosphor BaMgAl10O17 is discussed.The observation of the two kinds of luminescent centres,Eu2+F-and Eu2+(O2-),in the phosphor is reported. There exist Eu2+F-centres in the phosphor due to the substitution of F-ions for O2-ions. Effective energy transfer from Eu2+(F-)to Eu2-(O2-) was observed. The quenched concentration of Eu2+in BaMgAl10O17raised by 0.20 mol/Ldue to new luminescent centre Eu2+F-.
    Studies on the Preparation of Aluminium Oxide (Hydrous)Ultrafine Particles by the Method of Microemulsion Reaction
    CHEN Long-Wu, GAN Li-Hua, YUE Tian-Yi, ZHOU En-Xuan
    1995, 16(1):  13-16. 
    Asbtract ( )   PDF (443KB) ( )  
    Related Articles | Metrics
    The phase composition and properties of microemulsion system of water, Triton X-100,n-hexanol and cyclohexane, were studied.It shows that when n-hexanol and Triton X-100 is in the weight ratio of 2:3, this microemulsion system has extensive and stable microemulsion phase regions, and therefore is an ideal reaction system for the preparation of ultrafine particles. In the water-in-oil microemulsion system of Triton X-100,n-hexanol, cyclohexane and aluminium hydroxide sol, aluminum hydrous oxide(α-AlOOH) ultrafine particles were prepared by the method of precipitation with NH3 being used. According to transmission electron micrographs the mean diameter of particles is about 6 nm. The uniformity of particles is better. The particles size did not change when α-AlOOHultrafine particles were converted to γ-Al2O3 by heating. The special surface area of the ultrafine γ-Al2O3 powder sample is 159.2 m2·g-1.
    The Design of Topological Framework Structures of Analogues Correlated to AlPO4-5 in the Orthorhombic System(Ⅱ)──The Calculations for Steric Energies Esof the Designed Structures by Molecular Mechanlcs Method
    XUY Yi-Hua, LI Bao-Zong, PANG Wen-Qin
    1995, 16(1):  17-21. 
    Asbtract ( )   PDF (391KB) ( )  
    Related Articles | Metrics
    The theoretical steric energies Es of the 64 hypothetical molecular sieves framework topological structures have been calculated by molecular mechanics method in this paper, these structures are several analogues of AlPO4-5 family with orthorhombic system which had been designed recently. The results of calculated Es are closely related to the framework structures themselves. The Es of designed orthorhmbic AlPO4-500 framework structure is the same as that of hexagonal AlPO4-5 with the lowest Es (-3447 kJ/mol).It means that the structure is the most stable one.The Es of other two designed structures AlPO4-562 and AlPO4-557 Es are lower(-3419 and -3418 kJ/mol respectively). It means that the two structures might be stable and, probably, they can be synthesized. We found that these Es of designed structures are related with the order of interlaced up or down links of oxygen bridges on the interlayers of the structures. We suggested that the Es can be used as a criterion of exist probability for designed hypothetical framework structures of molecular sieves.
    Studies on the Reaction Between Mono-aluminate Anions and Mono-silicate Anions
    LI Shou-Gui, Mao Ya-Chun, XU Ru-Ren, TANG Ao-Qing
    1995, 16(1):  22-25. 
    Asbtract ( )   PDF (278KB) ( )  
    Related Articles | Metrics
    The reaction between mono-aluminate anions and mono-silicate anions in solution has been studied. Experimental results show that aluminosilicate precipitate is formed during the reaction.[Al],[Si] and[OH-]in the solution affect the formation of the precipitate and when the reaction reach the equilibrium,[Si][Al]/[OH-]2=1.0×10-3.The phenomenon of supersaturation exists during the reaction, which is affected by Si/Al and [OH-] in reaction mixture.
    Studies on Fluorescent Ptoperty of Degradation Product of Cephalexin and Its Analytical Application
    HE Xi-Wen, TANG Bo, SHEN Han-Xi
    1995, 16(1):  26-30. 
    Asbtract ( )   PDF (476KB) ( )  
    Related Articles | Metrics
    In this paper, the degradation reactions of cephalexin in acid and alkali media are deseribed in detail,and the corresponding fluorometric methods of cephalexin are presented by producing its stable fluorescent products. The linear ranges are 0. 50-100 ng/mL (acid degradation) and 2.0─70 ng/mL (alkali degradation), respectively. The fluorometry with acid degradation has more advantages of analytical precission and is more accuracy than that with alkali degradation,which has been used for the determination of trace cephalexin in human serum and urine with satisfactory results.
    Studies on the Electrode Process thermodynamics of Cytochrome C at A Microband Gold Electrode Modified with 4, 6-Dimethy1-2-mercaptopyrimidine
    CAI Chen-Xin, JU Huang-Xian, CHEN Hong-Yuan
    1995, 16(1):  31-34. 
    Asbtract ( )   PDF (324KB) ( )  
    Related Articles | Metrics
    The redox thermodynamics of cytochrome Cat a 4, 6-dimethyl-mercaptopyrimidine(DMMP), a new electron transfer promoter of cytochrome C, modified microband gold electrode(DMMP/Au)was investigated by cyclic voltammetry. The thermodynamic param eters of the electron-transfer reaction of cytochrome Cat DMMP/Au electrode were estimated. The normal potential E0', the changes of entropy,enthalpy and Gibbs free energy,△S0,△H0and △G0, for cytochrome Cat 25℃ and pH 7.0 were 0.272 V(vs. NHE),-123.7 J· mol-1·K-1,-63.1 kJ·mol-1and -26.2kJ·mol-1, respectively. The effects of temperature and pHon the thermodynamic parameters of cytochrome Cwere discussed. The E0' vs.Tplot shows remarkable biphasic character in an alkaline solution with a turning point at ca.45℃, whereas in an acid or neutral solution the E0' values changed monotonically with temperature.
    Catalytic Oxidation of Reduced Dihydronicotinamide Adenine Dinucleotide at Catechol Violet Modified Graphite Electrode
    ZHU Rong-Gui, HAN Ji-Lin, CHEN Hong-Yuan
    1995, 16(1):  35-38. 
    Asbtract ( )   PDF (348KB) ( )  
    Related Articles | Metrics
    In this work, catechol violet modified graphite electrode shows significantly electrocatalytic activity to the oxidation of reduced nicotinamide adenine dinucleotide (NADH),making oxidation overpotential decrease by 250 mV compared with the direct oxidation of NADH at bare graphite electrode. In the medium of 0. 1 mol/Lphosphate buffer (pH=7.0) the surface formal potential E0' and apparent electron-transfer rate of the adsorbed mediator catechol violet are 0.10 Vand 5.5s-1, respectively.
    The Electrochemical Behavior of Poly-3,4-ethyenedioxy-thiophene Modified Electrode and the Electrocatalytic Oxldation of Ascorbic Acid on the Electrode
    HOU Shi-Feng, FANG Hui-Qun, CHEN Hong-Yuan
    1995, 16(1):  39-42. 
    Asbtract ( )   PDF (1502KB) ( )  
    Related Articles | Metrics
    The electrochemical behavior of poly 3, 4-ethylenedioxy-thiophene modified electrode and the electrocatalytic oxidation of ascorbic acid (AH2) on this electrode were investigated. The oxidation peak potential shifts, negatively by 220 mV. The relationship between the oxidation peak current of ascorbic acid and its concentration in the rang of 1.0× 10-1─1.0×10-5mol/Lis linear. The modified electrode can be applied to the determination of ascorbic acid in fruit and other biological samples.
    Dual System and Dual Wavelength Fluorimetric Method and Its Use in Pharmaceutical Analysis
    ZHANG Gui-Zhu, ZHANG Hai-Qing, HE Xi-Wen, SHI Hui-Ming
    1995, 16(1):  43-46. 
    Asbtract ( )   PDF (297KB) ( )  
    Related Articles | Metrics
    A new dual system and dual wavelength fluorimetric method has been proposed and used to simultaneously determine similar substance phenol and resorcinol. The limit of determination is 0. 05μg/mLand its allowable concentration proportion is 1:10 to 10:1.This method has been used in analogous medicament with satisfactory results.
    Studies on Flow-injection Stopped-flow Florescence Kinetic Method for Determination of Trace Iron
    HUANG Hou-Ping, CAI Ru-Xiu, ZENG Yun-E, GAO Deng-Yun
    1995, 16(1):  47-49. 
    Asbtract ( )   PDF (318KB) ( )  
    Related Articles | Metrics
    A new flow-injection stopped-flow fluorescence kinetic method for determination of trace iron(Ⅲ) was proposed. The method is based on monitoring the binary fluorescence complex formation of Fe(Ⅲ) with 3,5-dibro mosalicylfluorone(DBSAF) at 510 nm/510 nm in an acidic medium.The linearity range is between 0.020 and 0.250 μg/mLwith a correction coefficient of 0.999 and a detection limitation of 10 ng/mL. The method has been ap plied to the determination of Fe(Ⅲ)in alluminum alloy and peach leaves, the results are in agreement with ICPmethod and standard reference value, respectively.
    Studies on Preparation and Electroanalytical Applications of Cu-PTFE Composite Electrode
    XU Hong-Ding, ZOU Ming-Zhu, CAO Zhan-Shuang, PAN Shu-Hong, YANG Hai-Quan
    1995, 16(1):  50-54. 
    Asbtract ( )   PDF (361KB) ( )  
    Related Articles | Metrics
    In this paper,the procedure of preparation of Cu-PTFE composite electrode by electroplating was investigated and the electroanalytical properties of alcohol, aldhyde and carbohydrate on Cu-PTFE composite electrode were examined.The results from experiments indicated that the detection limit by constant potential amperometry with Cu-PTFE composite electrode in flow injection analysis was lower(3×10-6 mol/Lfor glucose) and the process of electrode was electrocatalytic oxidation by Cu2O3.
    Synthesis and XPS Studies of Schiff Base Quasi-Aromatic Metal Complexes
    YANG Gao-Wen, XIA Xiao-Ping, ZHAO Cheng-Xue, WANG Dian-Fen
    1995, 16(1):  55-58. 
    Asbtract ( )   PDF (312KB) ( )  
    Related Articles | Metrics
    Twelve quasi-aromatic metal (Ⅱ) complexes were synthesized from the AEH (APH) and imidazole(benzimidazole)ligands and metal ions. X-photoelectron spectrometric study of these complexes disclosed that due to coordination the 2p bonding energies of the metal ions (M2p) are decreased and the B. E. of N1s is increased. During complexation, the direction of electron transfer is from the ligand to the metal ion (L→M); the coordination bonds formed are ofσ-type in character.
    Studies on Mixed Trialkyltin Derivatives(Ⅲ) ──preparation,Characterization and Biological Activitics of Dibutylcyclohexyltin Carboxylates
    YANG Zhi-Qiang, XIE Qing-Lan, ZHOU Xiu-Zhong
    1995, 16(1):  59-63. 
    Asbtract ( )   PDF (381KB) ( )  
    Related Articles | Metrics
    Twenty dibutylcyclohexyltin carboxylates were synthesized and their structures were chracterized through IR, NMR(1H,13C,119Sn)and MS. The compounds are five coordinated,carboxylate-bridged polymers for the fatty acid esters and four coordinated for the substituted benzoic esters. The biological activities of the products were also tested and the compounds showed a high fungicidal activity as well as a high acaricidal activity.
    Studies on Diterpenoid Constituents of Hedychium Yunnanense
    ZHAO Qing, HAO Xiao-Jiang, CHEN Yao-Zu, ZOU Cheng
    1995, 16(1):  64-68. 
    Asbtract ( )   PDF (363KB) ( )  
    Related Articles | Metrics
    The investigation of the rhyzomes of Hedychiumyunnanense Gagnep.afforded two new labdane type diterpenoids named yunnancoronarin A(4),B(5),together with three known ones hedychenone(1),7-hydroxyl-hedychenone(2), and coronarin E(3). Their structures were determined by spectral methods. Oxidation of 4 with PCCgave dehydroyunnancoronarin A(6), which rearranged to 1 under the acidic condition.
    Preparation of Tetrathiafulvalene Derivatives Containing Sulfur Substituting Groups from 1, 3, 4, 6-Tetrathiapentalene
    WANG Jian-Hua, YANG Geng-Xin, WANG Gui-Lin, SHI Zhen
    1995, 16(1):  69-74. 
    Asbtract ( )   PDF (392KB) ( )  
    Related Articles | Metrics
    Tetramethylthiotertrathiafulvalene,tetraethylthiotetrathiafulvalene,diquinoxalinylsulfur ether,4-methylthio-5-methoxy-carbonylthio-1, 3-dithiole-2-one,tetrakis(metliylthio) ethylene and 4, 4'-dimethylthio-5, 5'-dimethoxycarbonylthio tetrathiafulvalene have been prepared by means of coupling/alcoholysis/alkylation or alcoholysis/alkylation/coupling, and by using1, 3, 4, 6-tetrathiapentalene-2,5-dione as the starting material. Areasonable mechanism was given for alcoholysis of 1,3,4,6-tetrathiapentalene-2,5-dione.The reason for lack of the expected products was discussed.The electrochemical nature of the three tetrathiafulvalene derivatives prepared was studied by cyclic voltammetry.
    A Study of the Conformation of Some β-blockers
    XU You-Xuan, ZHANG Chang-Jiu, SHEN Li, WU Yun, WAN Shan
    1995, 16(1):  75-78. 
    Asbtract ( )   PDF (274KB) ( )  
    Related Articles | Metrics
    An improved procedurehs been established for the confirmation of some β-blockers in doping control analysis. The derivatives of the drugs and their metabolites have very similar mass spectra and retention time in our previous work, and it's very difficult to distinguish them. The derivatization and the extraction are performed simultaneously by using phosgene as the derivatization reagent in the new procedure. The new derivatives in this paper have very chracteristic mass spectra, and are easy to be confirmed.
    Synthesis of(4-Nitropphenylacetylenyl)(aryl)mercury
    ZHANG Xiao-Yi, WU Xiang-Dong, QIN Jin-Gui, LIU Dao-Yu
    1995, 16(1):  79-83. 
    Asbtract ( )   PDF (415KB) ( )  
    Related Articles | Metrics
    Aseries of new(4-nitrophenylacetylenyl)(aryl)mercury compounds were prepared by the reaction of aryl mercury acetate or aryl mercury hydroxide with 4-nitrophenylacetylene under a base condition. The results of ultraviolet absorption spectroscopic study showed that the reaction is reversible.All the compounds were characterized bv means of elementary analysis,IR,1HNMR,electronic and mass spectroscopies.
    Synthesis of Tris (2-methyl-2-phenyl propyl)tin Aryloxyacetates
    LIU Bao-Dian, NING Zhi-Gang, ZHU Dong-Sheng, BAO Ming
    1995, 16(1):  84-86. 
    Asbtract ( )   PDF (234KB) ( )  
    Related Articles | Metrics
    Seventeen tris(2-methyl-2-phenyl propyl)tin aryloxyacetates were synthesized by the reaction of corresponding aryloxyacetic acids and tris(2-methyl-2-phenyl propyl)tin hydroxide. The IR,1HNMRand 13CNMR spectra of these compounds were studied. The data of IRindicate that these compounds are four-coodinated monomeric organotin compounds.These compounds have a good acaricidal activity.
    Electrodeposition of Zn Deposits with Highly Preferred Orientation
    GE Fu-Yun, ZHANG Ying-Zhou, YAO Shi-Bing, XU Shu-Kai, ZHOU Shao-Min
    1995, 16(1):  87-90. 
    Asbtract ( )   PDF (388KB) ( )  
    Related Articles | Metrics
    Zn deposits with(0002)and(1011)highly preferred orientation were obtained in the solution of 0.8 mol/L ZnSO4,0.5 mol/L H2SO4and 4.0×10-4mol/LKMnO4by controlling tlie deposition potential or current.The deposits with highly preferred orientation were studied by X-ray diffraction and scanning electron microscope.The results showed that tl1e diffraction patterns of the deposits with(0002)and(1011)highly preferred orientation were very similar to tlie corresponding patterns of Zn single crystals. But there were little disloction stresses in the deposits.The effort was made to explain the reason for the deposits with highly preferred orientation from the polarization curve of the solution.
    The Problem of Electronic Transitions for Transition Metal Clusters
    LI Zhi-Ru, WANG Xiao-Peng, FENG Ji-Kang, SUN Jia-Zhong
    1995, 16(1):  91-93. 
    Asbtract ( )   PDF (339KB) ( )  
    Related Articles | Metrics
    The relationships between transition energies and molecular orbital gaps are analysed in brief and some special transition forms are discussed.
    Application of Fourier Transform Infrared Photoacoustic Spectroscopy to Porphyrins Studies(Ⅲ)──FTIR-PAS of Lanthanide Acetylacetonate-meso-Tetra(para-chlorophenyl)Porphyrin Rare Earth Complexes
    SHI Tong-Shun, LIU Guo-Fa, YU Lian-Xiang, CAO Xi-Zhang
    1995, 16(1):  94-97. 
    Asbtract ( )   PDF (317KB) ( )  
    Related Articles | Metrics
    The fourrier transform infrared photoacoustic spectra of tetra-(parachlorophenyl)porphyrin and its coordination compounds LnT(p-Cl)PPacac(Ln:Nd,Sm,Eu Gd,Tb,Dy,Ho,Er,Lu)in the range of 3600-220 cm-1were measured and investigated. Because of the coordination bonding between the rare earth ion and nitrogen in LnT(p-Cl)PPacac forms,the band near 400 cm-1and M-O stretching vibration on the acetylacetonate ring become weaker,and shifted to the lower wavenumber. Metal sensitive bands were found at about 1558,1474,1427,1219,798,733 and 250 cm-1.
    Ultrafine Mo/Al2O3Catalysts for Hydrodesulfurization(Ⅰ)──Catalytic Performances and Reduction Behavior of UFP-Mo/Al2O3Catalysts
    FENC Li-Juan, CHEN Song-Ying, PENG Shao-Yi, WEI Zhao-Bin, XIN Qin
    1995, 16(1):  98-102. 
    Asbtract ( )   PDF (383KB) ( )  
    Related Articles | Metrics
    The activities of hydrodesulfurization(HDS)and hydrogenation(HYD)for UFPAl2O3catalysts prepared by two methods,impregnation and supercritical fluid drying process,were determined in a continuous flow microreactor. It is shown that the catalytic properties and the dispersion of Mo species on alumina surface are greatly affected by the preparation method,as compared to that of ordinary Mo/Al2O3(prepared by impregnating ordinary γ-Al2O3with molybdenum salt),the HDS activities of UFP-Mo/Al2O3(prepared by implregnating UFPalumina with Mo salt)are considerably high under the same condition. So do the HYD activities. It is also indicated from TPR,LRS and XRD that the Mo loading at which bulk MoO3phase emerge for UFP-Mo/Al2O3is considerably higher than that for ordinary Mo/Al2O3catalysts,implying that using UFP-Al2O3and supercritical fluid drying process favor the dispersion of Mo species onto the surface of alumina.
    Ultrafine Catalysts for Hydrodesulfurization(Ⅱ)──Surface Properties of UFP-Mo/Al2O3Catalysts
    FENG Li-Juan, CHEN Song-Ying, PENG Shao-Yi, WEI Shao-Bin, XIN Qin
    1995, 16(1):  103-106. 
    Asbtract ( )   PDF (321KB) ( )  
    Related Articles | Metrics
    XPS was used for determining the surface properties of UFP-Mo/Al2O3.It is shown that all molybdenum existed in Mo6+form on the surface of oxidized UFP-Mo/Al2O3catalysts,while a mixture of Mo6+,Mo4+,S6+as well as S2-was observed on the surface of the catalysts after HDSreaction.The ratio of Mo and Sspecies with different valences ispronouncedly affedted by the preparation method and the Mo loading. The portion of Mo6+and S6+decreases with increasing Mo loading.The contents of Mo6+and S6+of s-UFP-Mo/Al2O3catalysts are higher than those of i-UFP-Mo/Al2O3for the same Mo loading.
    Temperature Programmed Desorption of Oxygen and Oxidative Activity of La2-xSrxNiO4
    LOU Hui, ZHENG Hong-Yuan, YANG Ju-Ying, YAO Zhi-Qiang, YU Xun, DU Shao-Bin, MA Fu-Tai
    1995, 16(1):  107-110. 
    Asbtract ( )   PDF (367KB) ( )  
    Related Articles | Metrics
    TPD of oxygen and catalytic activity of oxidation of CO and oxidative coupling of methane on La2-xSrxNiO4were studied. It was shown that two oxygen desorption peaks from two different temperature ranges were related to Ni2+and Ni3+ions in the crystal structure,respectively. The uptake of O2desorbed at a lower temperature increased when the amount of Ni2+increased,while the uptake of O2desorbed at a higher temperature increased with the increase of Ni2+content.The crystal oxygen took part in the reactions of CO oxidation and OCM directly.
    Studies on WO3/ZrO2and MoO3/ZrO2Solid Superacid Sytems
    GAO Zi, CHEN Jian-Min, YAO Yu-Ning, HUA Wei-Ming, MIAO Chang-Xi
    1995, 16(1):  111-115. 
    Asbtract ( )   PDF (490KB) ( )  
    Related Articles | Metrics
    The dispersion and crystal phase changes of tungsten and molybdenum compounds on samples prepared by impregnating ammonium metatungstate and ammonium paramolybdate on amorphous ZrO2during the calcination have been investigated in detail. It was found that after the calcination at 350℃ tungsten and molybdenum existed in the form of isopolyacidic anions,so that the apparent dispersion thresholds determined by XRD method were much greater than the calculated monolayer dispersion capacities of WO3and MoO3on ZrO2.After calcination at 800 ℃ the Wand Mo dispersed on ZrO2transformed into the form of WO3on ZrMo2O8,and the experimental apparent dispersion thresholds became approximate to the monolayer dispersion capacities of WO3and ZrMo2O8on ZrO2.The results of measurements by Hammett indicator and n-pentane isomerization methods showed that Ho of the WO3/ZrO2systems reached-13.8--14.5 and that of the MoO3/ZrO2systems-12.0--12.7,and the samples containing the amounts of WO3and MoO3close to their monolayer dispersion capacities and calcined at 800℃ displayed stronger superacidity.
    The Quantum-Chemical Study on Carbon Clusters C32and C32H32
    LI Qian-Shu, LI Song, TANG Ao-Qing
    1995, 16(1):  116-118. 
    Asbtract ( )   PDF (238KB) ( )  
    Related Articles | Metrics
    The optimization geometry and corresponding energy properties for Cnand CnHn,n=8,24 and 32, with restriction of Ohsymmetry configuration were calculated by means of MNDO method,showing C32with certain stability. The full optimization geometry and its πbond distribution for C32were studied by AM1 calculation and Boys localization method. The calculated results for states with S=0 and S=1 using the configuration interaction method.The calculated vibrational-mode and frequency for C32were also discussed at AM1 level
    Studies on Sulphonation of PES and PEEK under Mierowave
    NIU Li, ZHANG Wan-Jin, LU Hui-Juan, HANG Da-Zhen
    1995, 16(1):  119-120. 
    Asbtract ( )   PDF (143KB) ( )  
    Related Articles | Metrics
    Here we modified PES and PEEK with microwave chemically,and summarize the relations between heating-up time under microwave and degree of sulphonation. The effect on the sturcture of those derivatives was studied by using viscosity measurement.
    A Pulse Study of Oxidative Coupling for CH4on Li2O/MgO
    QI Yun-Shi, WEI Shang-Fang
    1995, 16(1):  121-123. 
    Asbtract ( )   PDF (278KB) ( )  
    Related Articles | Metrics
    In this paper,we report the results of studies on the activity of lattice oxygen, the effects of Li on lattice oxygen,and the process through which the gas phase oxygen takes part in the reaction. Apulse method was used in this study. It is proposed that the gas phase oxygen first changes into lattice oxygen and then reacts with methane. Li2O/MgO catalysts provide the active oxygen which reacts with methane to form C2hydrocarbons. Li2O doped on MgO catalysts restrain the deep oxidation of reactant or product,thus increasing selectivity.
    Elcctrochemical Study on Molybdenum-Containing Tetracomponent Heteropoly Tungstophosphates
    ZHANG Heng-Bin, QI Xing-Yi, ZHENG Jun-Wei, LI Shu-Jia
    1995, 16(1):  124-126. 
    Asbtract ( )   PDF (2312KB) ( )  
    Related Articles | Metrics
    Redox properties of molybdenum in K8[P2W18Mo2CO2(H2O)2O68][MoO6]· 15H2O and its derivatives in which Co atoms were substituted by Fe or Ni were studied with cyclic voltammetry. In addition, it was found that the cobalt-containing compound possesses electrochemical catalysis to the reduction reactions of O2and NaNO2to different extents.
    Studies on Phase Equilibria at Superatmospheric Pressures for Chloroform-Ethanol-Benzene Ternary System
    MA Zhong-Ming, CHEN Geng-Hua, WANG Qi, HAN Shi-Jun, YU Shu-Xian
    1995, 16(1):  127-129. 
    Asbtract ( )   PDF (212KB) ( )  
    Related Articles | Metrics
    The vapor liquid phase behavior for chloroform-ethanol-benzene ternary system is studied at pressures of 101. 3 and 302. 5 kPa. The vapor liquid equilibrium data are predicted by the three-component Wilson equation from the correlated energy parameters of the corresponding binary systems and compared with the experimental data. Good results are obtained. The experimental study indicates that some chlorine ions are generated in this ternary mixture when the temperature is over 400 K.
    Laser Scanning Miero-area Photovoltage Imaging of Corrosion on the Surface of Copper
    YANG Mai-Zhi, ZHANG Wen, CAI Sheng-Min, REN Ju-Jie, PAN Chuan-Zhi, YANG Yong
    1995, 16(1):  130-132. 
    Asbtract ( )   PDF (2294KB) ( )  
    Related Articles | Metrics
    The laser scanning micro-area photovoltage technique has been used in the research of copper corrosion in 3% NaCl solution. With the result of this method, the procedure of the local corrosion can be deseribed, and the effect of the corrosion inhibitor can also be evaluated.
    Kinetic Investigation of the Ruduction for Crowded[Co(tmen)3]3+by[Fe(CN)6]4-
    YAN Wen-Bin, ZHOU Zhao-Hui, ZHANG Hui, TANG Xing-Yuan, XU Zhi-Gu
    1995, 16(1):  133-135. 
    Asbtract ( )   PDF (244KB) ( )  
    Related Articles | Metrics
    Kinetic studies of the outer-sphere electron transfer reaction between[Co(tmen)3]3+and[Fe(CN)6]4-have been carried out at various temperatures and pHvalues. The ion-pair formation constant Qip of the precursor complex[Co(tmen )3]3+[Fe(CN)6]4- is 5.6×102L·mol-1, and the rate constant ket for the electron transfer within the ion-pair is 6.8×10-3s-1at 25℃ and I=0.10 mol/L. The activation enthalpy △Het≠and the activation entropy △Het≠of this reaction are 1.6×102kJ/mol and 6.5×102J/mol·K respectively. The mechanism of the reaction is discussed.
    Method of Negative Imaginary Potentials for Treating Quantum Reactive Scattering
    CAI Yu-Min, HU Xu-Guang, LI Qian-Shu
    1995, 16(1):  136-138. 
    Asbtract ( )   PDF (243KB) ( )  
    Related Articles | Metrics
    In this paper three kinds of initial translational wave functions are selected for the method of negative imaginary potentials,and their influences on the calculations of reaction probabilities for collinear atom-diatom reactive scattering are examined. The results show that highly decaying function factors at the origin must be included in the initial translational wave functions. The approximate translational wave functions selected in the paper can obviously raise the accuracy of the calculational results.
    Studies on Isothermal Crystallization Kinetics of iPS-b-iPP Block Copolymer
    XU Guang-Xue, LIN Shang-An
    1995, 16(1):  139-142. 
    Asbtract ( )   PDF (371KB) ( )  
    Related Articles | Metrics
    The isothermal crystallization Kinetics of styrene/propylene block copolymer(iPSb-iPP)has been investigated by DSC. The results indicated that the kinetics of isothermal crystallization for all of samples was fitted for the Avrami,equation quite well within selected crystallization temperature(127-132℃),and that the crystallization temperature, crystallization rate and crystal growing mechanism were affected by the composition ratio of iPS-biPP. With the increase of the content of iPSblock in iPS-b-iPP copolymers crystallization rate(G)and Avrami exponent(n) were significantly reduced.In addition, a discussion about the relationship between the growing mechanism of crystals and the composition ratio of iPSb-iPPwas made based on the Avrami exponents and TEM.
    Studies on the Nucleation and Crystallization of β-Crystal of Polypropylene in Light Calcium Carbonate/Polypropylene Blends.
    LIAO Kai-Rong, CHEN Xue-Xin, ZHENG Chen-Mou
    1995, 16(1):  143-146. 
    Asbtract ( )   PDF (421KB) ( )  
    Related Articles | Metrics
    The phenomenon of nucleation and crystallization of β-crystal of polypropylene(PP)in light calcium carbonate(L-CaCO3)/PPblends was studied by X-ray diffraction and differential scanning calorimetry. It was found that the nucleation and crystallization of βcrystal of PPin L-CaCO3/PPblends was dependent on the PPsamples used. Aluminate coupling agents have a synergistic effect on the nucleation and crystallization of β-crystal of PPin L-CaCO3/PPblends. It is believed tl1at the phenomenon of nucleation and crystallization of β-crystal of PPin L-CaCO3/PPblends is the result of the action of a complex nucleation agent composed of residues of the catalyst used for polymerization of propylene and L-CaCO3,and the aluminates may be considered as promoters in the complex nucleation agent.
    Studies of Coating and Etching Process of JD Resin with XPS
    GAO Chang-You, ZHENG Da-Fang, YANG Bai, WEI Quan, SHEN Jia-Cong
    1995, 16(1):  147-151. 
    Asbtract ( )   PDF (490KB) ( )  
    Related Articles | Metrics
    The etching process of JDresins studied with XPS shows that benzene rings accumulated on the surface more than in the body. The amount of groups such as C-OH,C=O,C-SO3H and COOH introduced into the surface during etching increased with the increase of temperature or the prolonging of the time,and the content of every groups is calculated. The abrasion-resistance coating after being solidified has SiO2structure. The priority etching condition for JD resins is at 20℃ kept for 20 min,so that the adhesion strength of the coating is increased while the light transmittance of the substrate is not decreased obviously.
    The Morphology and Electrical Conductivity of LDPE/CPE/Carbon Black Electrical Conductive Composites
    ZHANG Xiong-Wei, HUANG Rui
    1995, 16(1):  152-155. 
    Asbtract ( )   PDF (293KB) ( )  
    Related Articles | Metrics
    In this paper, the morphology and electrical conductivity of LDPE/CPE/carbon black composites were studied.It was shown that depending on the composition, the composites may show "sea-island"structure or dual-continuous phases interlocking structure.Above the blend ratio of LDPE/CPE= 50/50,the electrical conductivity of LDPE/CPE/carbon black composites is higher more than 2-5 orders of magnitude than that of LDPE/carbon black composites,which is mainly caused by the heterogeneous distribution of carbon black particles in the two incompatible polymer components,i.e. LDPE and CPE. This experimental result indicates that addition of an incompatible polymer to a polymer filled with carbon black can be a new method to increase the electrical conductivity of polymer composites.
    Studies on Grafting Ethyl Acrylate onto Gelatin by SDS-PAGE
    LIU Xiao-Heng, YAN Tian-Tang
    1995, 16(1):  156-158. 
    Asbtract ( )   PDF (234KB) ( )  
    Related Articles | Metrics
    The grafting mixtures were meatqured by a slab method of sodium dodecyl sulphate-polyacrylamide gel electrophoresis(SDS-PAGE).It was proved by this test that all ingredients in gelatin(αP,α,β,γ,γp)could be grafted with ethyl acrylate and most gelatin molecules were converted into grafting copolymers whose Mnwas much more than 3×105.This conclusion and the chracterization of grafting percentage or grafting efficiency from the SDS-PAGE patterns were similar to those from usual quantitative analysis in this paper.
    Crystallization and Melting Behavior of PPS in the Ctystalline/Crystalline Blends of PPS and PEEK(Ⅱ)──Efrect or Melt Conditions on Crystallization and Melting Behavior or Annealed Blends
    MAI Kan-Cheng, XU Jia-Rui, MEI Zhen, ZENG Han-Min
    1995, 16(1):  159-161. 
    Asbtract ( )   PDF (206KB) ( )  
    Related Articles | Metrics
    The effects of melt conditions on the crystallization and melting behvror of annealed poly(phenylene sulfide)(PPS)and its blends with poly(ether ether ketone)(PEEK)have been investigated. The intensity of the high temperature endothermic peak(Tm2)of PPS decreased as adding of PEEK, while the peak temperature does not change significantly. As the melting temperature and time increatqe, the height of Tm2decreases and the location of the peak shifts to the lower temperature.
Special Issues
More...
Download
More...
Links
More...