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Table of Content

    24 April 1992, Volume 13 Issue 4
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    Articles
    Measurement of the Formation Rate Constants of-Coenzyme B12 Models by Thin Layer Spectroelectrochemistry
    ZHENG Guo-dong, SUN Hao-ran, CAO Xi-zhang
    1992, 13(4):  421-424. 
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    The formation rate constants of coenzyme B12 model compounds produced through the reaction of [Co(I)TPP]- with PhCH2Cl, CH3I, CH3(CH2)3Cl was measured by thin layer spectroelectrochemistry i.e.single potential step chronoabsorptiometry(SPS-CA).Their values are 1.62 × 102 mol-1·L·s-1 for PhCH2Cl, 11.09 mol-1·L·s-1 for CH3Iand 6.93 × 10-2 mol-1·L·s-1 for CH3(CH2)3Cl respectively.These reactions are second order and first order in respect of [Co(I)TPP]- or RX.
    Studies on the Synthesis and Properties of Novel Silicoalummophosphate Molecular Sieve CHSAPO-7
    ZHAO Rui-lan, ZHAO Zhen-hua
    1992, 13(4):  425-428. 
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    A novel silicoaluminophosphate molecular sieve CHSAPO-7 was synthesized hy-drothermally in the system [(i-C3H7)2NH]-Al2O3-P2O5-SiO2-H2O.The samples obtained were characterized by means of X-ray powder diffraction analysis and infrared spectroscopy.The result of electron probe energy dispersion analysis of CHSAPO-7 indicates that Si atoms are inserted into the framework of CHSAPO-7.The chemical composition of CHSAPO-7 was determined.The properties of CHSAPO-7 , such as crystal morphology, adsorption capacities and thermal stabilitity, were studied.In addition, the influence of the amount of diisopropylamine used and the initial pHvalue of the reaction mixture on the crystal phase of product was investigated.
    Synthesis, Structure of Di-vacant Dawson Phosphotungstate K10Na2H2P2W16O60·18H2O and Its Stability in Solution
    WU Xin-guo, JIANG An-ren
    1992, 13(4):  429-432. 
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    The slightly soluble crystals K10Na2H2P2W16O60· 18H2O can be obtained by additionally adding excess KCl to a slightly acidic solution (pH6.5～6.9) which can be prepared by acidizing the mixture of para Aand Na2HPO4 with HCl to the right pHvalue.Para Ais freshly prepared by acidizng the solution of Na2WO4 with HCl to the [H+]/[WO42-] value of 1.14.The compound was characterized by elemental analysis, VO2+ titration, UV, 31PNMR and 183W NMR spectroscopy.The structure of the compound belongs to Dawson type of species.This compound decomposes as a heteropoly anion H7PW8O336- when it dissolves in water by heating and also decomposes as a main product PW11O397- when the counterion in solution is changed from K+ to Na+.
    Studies on Crown Ether Coordination Compounds (ⅩⅣ)——The Transport of Potassium Ions by 2,3-Benzo-11-Methyl-18-Crown-6 Liquid-Membrane-Mimicking Cell Membranes
    WANG Zhi-Iin, SHEN Meng-chang, LUO Qin-hui
    1992, 13(4):  433-436. 
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    Liquid membranes containing 2,3-benzo-ll-methyl-18-crown-6(BCl-18C6) is able to transport metal ions against their concentration gradient.The migration of metal ions is a consecutive first order process when the concentrations of metal ions in source phase and of carriers in membrane phase are comparable, the transport rate is proportional to the difference between the product of cation and anion concentrations in source phase and that in receiving phase.The influence of stirring rate on the transport mechanism was considered.
    Synthesis and Crystal Structure of Lanthanum Complex of 1-Methyl-1,4,7,10-Tetraazacycl ododecane
    WEI Ping-rong, JIN Tian-zhu, XU Guang-xian, JIN Zhong-Sheng
    1992, 13(4):  437-440. 
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    The complex [La(L)(CH3CN)(H2O)(CF3SO3)3] was synthesized, where L = 1-methyl-1,4,7,10-tetraazacyclododecane.The crystal structure of the complex was determined and a final Rvalue of 0.060 and Rw value of 0.064 were obtained, respectively.The crystal belongs to a monoclinic system, space group is P21/n with a=0.9700(2) nm, 6=1.5966(2) nm, c = 1.9085(1) nm, β= 104.71(3)°, V = 2.8588(50) nm3, Z = 4, Dcalc=1.93 g/cm3.The coordination number of lanthanum ion is nine, forming a distorted monocapped square antipriosm.
    The Synthesis and Crystal Structure of a Trigonal-Planar Complex of Zinc [Bu4N][Zn(SC6H2Pr3i-2,4,6)3]·PriOH
    TANG Ka-luo, LI Ai-qun, JIN Xiang-lin, TANG You-qi
    1992, 13(4):  441-442. 
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    The title complex was prepared and structurally characterized.The crystal belongs to space group P21/c, a= 1.4335(8) nm, b=2.4389(16) nm, c = 2.0556(12)nm, β=105.91 (5)°, V=6.911(7) nm3, Dc ==1.031 g/cm3 for Z = 4,R=0.076.Rw = 0.072 for 3846 reflections.The zinc is trigonal-planar coordinate.The average Zn-S bond length is 0.246 nm.
    Preliminary Screening of Some Platinum and Palladium Complexes as Antitumour Agents Using Fluorimetry
    LIN Hui-xiang, BI Qiong-si, PENG Hua, LI Zhi-liang, YU Ru-qin
    1992, 13(4):  443-446. 
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    A fluorimetric method based on ethidium bromide/DNA system was used for preliminary screening of some platinum and palladium complexes with potential antitumour activities.14 complexes of palladium and platinum with ammonia or bidentate amine as the first ligand, and nitrate, bovine serum albumin(BSA) or dextran sulphate(DS) as the second ligand were studied.The antitumour activities of complexes and the associated constants of these complexes with DNAwere estimated.At the low concentration level the association reaction between complexes and DNAwas of intercalation mode for small ligands such as nitrate; while for macromolecular lig-ands such as BSAor DSthe intercalation mode was not the unique reaction mode.The results of the proposed fluorimetric screening method are in reasonable agreement with those obtained by other in vitro screening procedures.
    A New Standard Addition Method of ISEs Using Sample and Standard Series with Concentrations Decreased at Identical Rates
    LUO Deng-bai
    1992, 13(4):  447-449. 
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    In this paper a new standard addition method is proposed, in which sample solutions with the same volumes Vx and different concentrations Cx/N(in general, 1≤N≤2) are separately titrated with the standard solution .The volume and concentration of the standard solution added to each sample are Vs and Cs/N, where Nis the same as that of the titrated sample solution.Based on this procedure semilogarithmic linear plots of △EN vs.Nwere obtained, where △EN is the difference between potential after addition and potential of the original sample, Nis the decreased times of concentrations of correlative sample and the standard solution.The con-centration Cx of the analyte is determined from the intersection, N0, by the equation:Cx＝CsVs[(N0-1)Vx+N0Vs].
    Studies on the Photochemical Fluorimetry(Ⅵ)——Determination of Dye-Mixtures by Using Differential Rate Kinetic Photochemical Fluorimetry
    GUO Xiang-qun, XU Jin-gou, CHEN Guo-zhen
    1992, 13(4):  450-453. 
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    Photochemical fluorimetric methods for the determination of Azo-dyes, Amaranth (AM) and Direct Sun-resisting Light Yellow(DY) are described.Adifferential rate method is uesd for resolution of mixtures of these dyes.The principle of these methods are discussed.Linear calibration curves are obtained over the ranges of 0～220 ng/mLand 0～120 ng/mLfor AMand DY, respectively (r= 0.999 for both), the limits of determination are 0.64 ng/mL AMand 0.045 ng/mL DY.The relative standard deviation is 1.6%(n=8) and 1.8%(n = 7) for AMand DY, respectively, these methods have been applied to the determination of dye-mixtures with satisfactory results.
    Investigation of Linear Sweep Voltammetry(Ⅲ) ——The Theory of Quasi-Steady-State Current Controlled Simultaneously by Diffusion and Charge Transfer Rate at Ultramicrodisk Electrode
    WU Zhi-bin, ZHANG Zu-xun
    1992, 13(4):  454-458. 
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    In this paper, the theory of quasi-steady-state current controlled simultaneously by diffusion and charge transfer rate at an ultramicrodisk electrode is described.The behaviours of current-potential curves are discussed and the methods for the determination of heterogeneous rate constant(ks) and transfer coefficient (a) from experimental results are reported.Experiments were carried out on platinum ultramicrodisk electrode to verify the theory.The experimental data of constant potential and linear sweep voltammetry are in good agreement with theoretical values for the oxidation of Fe(Ⅱ) in 1.0 mol/L H2SO4 solution.
    Differential Speed Spectrophotometric Determination of Fe and Cr Ions in Sewage with Xylenol Orange
    CHEN Ye-pu, ZHANG Jun, PENG Hong-yu, YAO Biao, LI Pei-zhi
    1992, 13(4):  459-461. 
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    The present paper contains the A～t kinetics activity that exhibits in the process of reaction of Cr(Ⅲ) and Fe(Ⅲ) ions with XOand other colorants.Two complex compounds derived from the reaction of Fe (Ⅲ) and Cr (Ⅲ) with xylenol orange and other colorants have similar light absorbance but their speeds of reaction are obviously different while the repeatability of their A～t curves is satisfactory accordingly, a new differential speed kinetics analysis has been devel-opped, with which the bimixtrue of Fe(Ⅲ) and Cr(Ⅲ) was determined simultaneously.The result is satisfactory when it is used in the determination of sample sewage.Linearity 0～0.25 mg/ mL, recovery 95%～106% and detection limit 0.1μg/mL.
    Fluorescence Quenching Method for Determination of Trace Cadmium with Meso-Tetrakis-(Trimethylammoniumphenyl) Porphyrin
    PAN Zu-ting, XU Mian-yi, LI Jia
    1992, 13(4):  462-463. 
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    A fluorescence quenching method for determination of trace cadmium(Ⅱ) with meso-tetrakis-(trimethylammoniumphenyl) porphyrin in the presence of anionic surfactant (sodium lauryl sulfate, SDS) was studied.The maximum excitation appears at 415 nm with fluorescence occuring at 650 nm.The limit of detection is 3×10-4 ppm Cd(Ⅱ).Seven replicate determinations of solutions containing 0.20 μg Cd(Ⅱ) show a relative standard deviation of 4.1%.
    Establishment of Quantitative Analysis Predictive Model with Latent Root Estimator
    WEI Wan-zhi, ZHU Wen-hong, YAO Shou-zhuo
    1992, 13(4):  464-466. 
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    In this paper a new method for achieving predictive models, called latent root estimator, is introduced.The technique was utilized for the simultaneously quantitative measurement of a system containing five components (salicylic acid, thymol, phenol, benzoic acid and resorcin) from their severely overlapping UVspectra and the predictive performance of the resultant calibration model was tested with a separate set of samples.The results indicate that the method possesses an obvious significance to gain stable predictive equations for collinearity systems and to reduce the influence of instrumental noise for concentration estimation.
    Study on Vaporizer for ETV-ICP-AES
    HUANG Min, JIANG Zu-cheng, ZENG Yun-e
    1992, 13(4):  467-469. 
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    A graphite furnace was employed as a vaporizer for sample introduction into a inductively coupled plasma(ETV-ICP-AES).The interface design, the effect of geometry and volume of the vaporizer including "insert platform" were studied.And a piece of graphite rod was put from the end of the graphite tube to minimize "dead volume", only allowing carrier gas passed through the arc tunnel between the tube and the rod.The temperature and its distribution inside the vaporizer were also explored.Finally, the platform vaporization and wall vaporization were discussed.
    Syntheses and 1H NMR Studies of Substituted Styryl-10H-Pyrido [1,2-a]Indolium Perchlorates
    LIU Zhi-jie, LI Wen-ge, ZHANG Jian-heng, GONG Yong
    1992, 13(4):  470-473. 
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    Condensation of 8,10,10-trimethyl-10H-pyrido[1,2-a]indolium perchlorate with substituted benzaldehyde in the presence of piperidine yielded 12 new 8-substituted styryl-10, 10-dimethyl-10H-pyrido[1,2-a]indolium perchlorates.Their structures were confirmed by elemental and spectral analyses.The substituent effects on the chemical shifts of different protons of the title compounds are discussed.The quantitative correlations between the chemical shifts and the substituent constants are described.
    The Synthesis of Crown Ethers (ⅩⅩ) ——Synthesis of Bridged Crown Ethers
    WANG Yu-ting, HUANG Zai-fu, ZHAO Wen-tao, GUO Bin, WANG Xiao-bing
    1992, 13(4):  474-477. 
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    Fourteen new bridged crown ethers have been synthesized by the reaction of asymmetrical cis-trans isomers of dibenzodihydroxy-14-crown-4 with malonyl dichloride, butanedioyl dichloride and hexanedioyl dichloride respectively.Their structures wer.e confirmed by IR, 1H NMR, MSand elemental analysis.The experimental results demonstrate that the cis isomers react with butanedioyl dichloride and hexanedioyl dichloride to form 1:1 and 2:2 condensation compounds, while malonyl dichloride only to form 2:2 condensation compounds.The trans iso-mer reacts with the above three aliphatic acid dichlorides all to form 2:2 condensation compounds.
    Synthesis and Characterization of Some N-Ferrocenoyl- arylhydroxylamines and Their Cu(Ⅱ) Chelates
    ZHANG Wen, BIAN Zhan-xi, LI Feng-ze
    1992, 13(4):  478-480. 
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    A series of N-ferrocenoylarylhydroxylamines have been synthesized by the partial acy-lation of arylhydroxylamines with the ferrocenoyl chloride.These organometallic compounds can act as ligands for metal chelation and their Cu(Ⅱ) chelates have been isolated.The ligands and chelates have been characterized by elemental analysis, IR and 1H NMRspectra.The chelates can act as solid propellant burning rate modifiers.
    Phenylpropanoid Glycosides from Pedicularis Genus Plants (Ⅰ)
    JIA Zhong-jian, LIU Zi-min, WANG Chang-zeng
    1992, 13(4):  481-482. 
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    Two new phenylpropanoid glycosides, pedicularioside Gand H, were isolated from the whole plants of Pedicularis spicata Pall.On the basis of spectral data and chemical evidence, pedicularioside Gand Hwere elucidated to be 1' -O-β-D-(3,4-dihydroxy-β-phenyl)-ethyl-4' -O-caffeoyl-a-L-rhamnosyl (1→ 3')-galactopyranoside and 1' -O-β-D-(3-methoxy-4-hydroxy-β-phenyl)-ethyl-4' -O-feruloyl-β-Z)-apiosyl (1→3')-a-Z,-rhamnosyl (1→6')-glucopyranoside, respectively.
    Phenylpropanoid Glycosides from Pedicularis Genus Plants (Ⅱ)
    LIU Zi-min, JIA Zhong-jian, WANG Chang-zeng
    1992, 13(4):  483-484. 
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    Two new phenylpropanoid glycosides, pediculariosides Eand I, were isolated from whole plants of Pedicularis lasiophrys Maxim and P.longifora Rudolph, respectively.On the basks of spectral data and chemical evidence, their structures were determined to be 1'-O-β-.D-(3-methoxy-4-hydroxyl-β-phenyl)-etliyl-6' -O-feruloyl-a-L-(2-acetyl)-rhamnosyl (1→3')-4'-O-acetyl-glucopyranoside and 1' -O-β-D-(3-methoxy-4-hydroxy-β-phenyl)-ethyl-a-L-rhamnosyl (1→3')-a-L-arabino.syl(1→4')-6' -O-feruloyl-glucopyranoside.
    Synthesis and Film-forming Property of 2-(p-Dodecyloxy Phenylethynyl)Pyrazine-5-Carboxylic Acid
    ZHAO Xiu-tai
    1992, 13(4):  485-486. 
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    2-(p-Dodecyloxy phenylethynyl)pyrazine-5-carboxylic acid was synthesized from p-hydroxybenzaldehyde and 5-methylpyrazine-2-carboxylic acid.The structure of this compound was identified by IR, 1H NMR, MSand elemental analysis.The film-forming property of the compound was preliminary studied.
    The Stereospecific Synthesis of 3-Methyl-5-Phenylsulfonyl-3E-Penten-1-ol
    MAO Jian-min, LI Wei-dong, LI Ying, LI Yu-lin, LIANG Xiao-tian
    1992, 13(4):  487-489. 
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    The stereospecific synthesis of 3-methyl-5-phenylsulfonyl-3E-penten-1-ol (1) was accomplished by using 4-hydroxyl-2-butone(2) as the starting material through four steps.The key step in synthesis is the stereospecific rearrangement of allylic alcohol(4).
    Selective Oxidation of Phenylthioacetates to Phenylsulfinylacetates with Sodium Perborate
    XU Xiao-qing, ZHOU Wei-qing, ZHANG Zheng
    1992, 13(4):  490-492. 
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    Ten phenylsulfinyl acetates were obtained by the selective oxidation of the corresponding sulfides with sodium perborate (NaBO3 · 4H2O) in acetic acid at 50～55℃.The present method has the following advantages: 1.mild conditions are employed; 2.normally over oxidation is not observed; 3.the reagent is readily available and can be safely handled; 4.excellent yields are obtained.
    Reactions Between Sodium Hydrogen Telluride and Aminoalkylbenzotriazoles
    WANG Jin, ZHOU Xun-Jun, DU Shao-bin
    1992, 13(4):  493-494. 
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    Aminoalkylbenzotriazoles (1) were obtained from benzotriazole.amines and aldehydes by Mannich reaction.Sodium hydrogen telluride reacted with (1) in DMFsolution to produce N-substituted benzylamines or N-methylamines (3).
    The Preparation and Silylation of 5-Hydro-1,4,6,9-Tetraoxa- 5-Phosphaspiro[4.4]nonane
    LIU Lun-zu, LI Guo-wei, HUANG Ming-zhi
    1992, 13(4):  495-497. 
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    5-Hydro-1, 4,6,9-tetraoxa-5-phosphaspiro[4.4]nonane 2 was prepared by the reaction of 2-chloro-1,3,2-dioxaphospholane with glycol in good purity and yield.Compound 2 reacted with pentamethylsilylamine or trimethyl silyl chloride to give glycol disilyl ether, silyl phosphite and cyclic diphosphite.
    Quantum Chemical Study of Excited State Double Proton Transfer of the 7-Azaindole Dimer
    TENG Qi-wen, FENG Ji-kang, XU Wen-guo, LI Zhi-ru
    1992, 13(4):  498-501. 
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    Using AM1 and INDO/CImethods, the potential energy surface and mechanism of double proton transfer of excited state of 7-azaindole dimer have been studied.In ground state, the energy of normal dimer is lower than that of the tautomer, although the stronger intramolec-.ular hydrogen-bonds exist in the tautomer.Under the condition of photo-emission, the normal dimer can be turned into the tautomer through two proton transfer of excited state, which causes the abnormal stokes shift of the fluorescence.
    Studies on Ion Exchange and Adsorption of Au(Ⅰ), Ag(Ⅰ) and Other Cyanide Ion by BPR Resin (Ⅰ) ——Kinetic of Adsorption and Elution
    GAN Wei-tang, LIU Yan-ming, ZHANG Yu-fan
    1992, 13(4):  502-505. 
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    In this paper, we have studied the adsorption properties of gold by BPRin alkali solution, the single and dual component kinetic mass transfer process of Au(I), Ag(I) and other metal cyanide ions.The results obtained show that the mass transfer rates of the cyanide ions in the resin phase are closely related to the molar ratio and the configuration of metal cyanide ions.The elution kinetics of Au(I) and other cyanide ions by NH4SCN has been investigated systematically.
    The Bond Properties of Cerium Halide
    WANG Yi
    1992, 13(4):  506-508. 
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    With the aid of Ziegler' s transition state method and the improved Xa-SWmethod, the bond properties of cerium halide are analyzed energetically.The result shows that, the cova-lent bond of Ce-X(Xrepresents halogen) is mainly due to the 5d and 4f orbitals of cerium) The spin unpairedly occupied molecular orbital is primarily composed of the 4f orbital of cerium; Some of the spin pairedly occupied molecular orbitals are formed by the considerable mixture of the 4f orbital of cerium and the orbitals of halogen; The action of ionic bond is principal for CeF3, however, the action of ionic bond is not evidently different from that of covalent bond for the other halides.
    Studies on Structure and Porperties of Tetraphenylporphyrin and Its Derivatives (Ⅲ)——Standard Molar Enthalpies of Sublimation, and Formation, Enthalpies of Strain and Resonance Energy
    LI Liang-chao, LUO Ming-dao, QU Song-sheng, HUANG Su-qiu, YAN Xiao-ci
    1992, 13(4):  509-512. 
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    Based upon the structural characteristics of tetraphenylporphyrin and its derivatives, we defined  Firstly, (这里有图片19920428-509-1.gif) and ΔS-R  Phy-X are determined, then the standard molar enthalpies of sublimation, the standard enthalpies of formation in gas phase are obtained.The enthalpies of strain, resonance energies and twisty angle of these compounds are also obtained by HMO method.The linear relationship between the gas phase standard enthalpies of formation and the substituent constants is discussed.
    Theoretical Study on the Thermolysis of Thietane
    CHEN Guang-ju, FU Xiao-yuan, TANG Ao-qing
    1992, 13(4):  513-516. 
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    The mechanism of the thermolysis of thietane to form ethylene and thioformaldehyde has been studied by using ab initio SCF MOmethod at STO-3G* and 3-21G* levels.It has been found that there are two possible stepwise pathways and the cleavage of C-Sbond is preferred over that of C-Cbond.The basic characteristic of these two step processes is to produce biradical intermediates.
    Studies on the Synthesis and Cross-linking of Ga-substituted Saponite
    LIU Zi-yang, HUANG Dong-lü, SUN Tie, JIANG Da-zhen, MIN En-ze, HE Ming-yuan
    1992, 13(4):  517-520. 
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    The Ga-substituted saponite and its cross-linking materials with hydroxy aluminium oligmer were characterized by means of XRD, MAS NMR, IR, chemical analysis.The results indicate that the charge of tetrahedral sheet and pillaring density are related to the amounts of Gallium in tetrahedral sheet.The binding of pillar with sheet occured by the way of Ga-O-Alp linkage while the pillared Ga-saponite was calcined.But the basic framework of Al13 does not change.
    Isobaric Vapor-Liquid Equilibrium of Methanol- Ethanol-Water-Salt Systems
    LIU Wen-bin, WANG Jian-ji, BAI Tong-chun, WANG Cai-lan, LU Jin-suo
    1992, 13(4):  521-524. 
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    The vapor-liquid equilibrium data of methanol-ethanol-water-NaCl, NaBr, Nal, LiCl and CaCl2 were measured with the CP Iebulliometer at 93.33 kPa.We find a linear relationship between the boiling temperature and the mole fraction of the salt added when the relative composition of the ternary solvent is fixed.Also, a linear equation for the equilibrium was derived by using the thermodynamical theory and the origination of the linear relationship was discussed with Gibbs phase rule.
    The Relative Interfacial Free Energy Curved-Surface of a Liquid Drop Floating on an Immiscible Liquid Surface and the Derivation of Neumann's Triangle
    WANG Zheng-lie
    1992, 13(4):  525-528. 
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    According to the fundamental principles of thermodynamics, the stable form of a liquid floating on another immiscible liquid has been discussed for all the combinations of the three interfacial tensions, and the relationship between the interfacial tensions and the contact angles of liquid drop-Neumann' s triangle has been derived.The relative Helmholtz free energy curved-surfaces of the system have been plotted for certain types on the basis of the calculated values.
    Studies on the Mechanism of Sulfoxide in Extracting Carboxylic Acid
    JIN Ji-chun, WU Wan-nian, YANG Xiao-long
    1992, 13(4):  529-532. 
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    By using double logarithm method,the macroscopic structure of extraction complex of diesel oil sulfoxide and tartaric acid was identified.It is proved by IRspectra that sulfoxide and tartaric acid form extraction complex by way of hydrogen bond.The molecular ions of the extraction complex were observed directly in field desorption mass spectrometry and the structure of extraction complex exists in more than one form.Comparing the Rf value of paper chromatography of various carboxylic acid,it is discovered that the hollow effect plays an important role on the mechanism of sulfoxide in extracting carboxylic acid.
    Establishment and Verification of Quantitative Relationship Between Rate Constants for Hydrolysis of Organic Pollutants and Concentrations of Humic Substances
    HAN Shuo-kui, JIANG Li-qiang, WANG Lian-sheng
    1992, 13(4):  533-534. 
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    Quantitative relationship between rate constants k for hydrolysis of organic pollutants and the concentrations of humic substances, k = k'/(1 + AM) , was proposed.The relationship was verified by three esters.Association coefficient Aderived from the method of Sep Pak column agrees with that derived from the method of hydrolysis well.
    A Study of Adsorption Property of Natural Polymer Chitosan as Adsorbent
    HUANG Jin-ming, JIN Xin-rong
    1992, 13(4):  535-536. 
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    Chitosan and the particles of its crosslinked derivatives were manufactured,and the adsorption properties for Hg2+ ,Cu2+ , Ag+ and Pd2+ were studied in this paper.The result indicates that the particles keep its rigidity in the acidic solution,the capacity for Pd2+ is 480 mg/g, and it has an adsorption selectivity to Pd2+ when Cu2+ and Pd2+ are present simultaneously in the solution.These particles could be used in collecting precious metals from waste water.
    The Preparation of Monodisperse Copper Oxide Sol Particles
    HAN En-shan, WANG Ze-xin, CHENG Shi-kui, CHEN Zong-qi, Zhu Ling-zhi
    1992, 13(4):  537-539. 
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    Copper (Ⅱ) oxide was prepared by aging copper sulphate, copper nitrate, copper chloride and copper acetate at elevated temperature and under controlled pHconditions.The sols with various particle shapes and uniformity were obtained depending on the experimental conditions.The particle size and shape characteristics in each precipitation region were determined by electron microscopy.
    Preparation and characterization of Ultrafine Particles of Cr2O3
    ZHANG Yan, ZOU Bing-suo, LI Shou-tian, XIAO Liang-zhi, BAO Xin-nu, SHI Su-hua
    1992, 13(4):  540-541. 
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    This paper reports the preparation of Cr2O3 ultrafine particles, the surfaces of which were modified by sodium dodecyl benzene sulfonate(DBS) and stearic acid(ST).The Cr2O3 ultrafine particles are characterized by IR, TEM, XPS, electron diffraction and UV-vis absorption spectometry.The results are explained by using quantum size effect.
    Diffusion Behavior of the Copolymerized Ultrafine Particles of Styrene and Divinylbenzene in Solution
    YIN Rui, LI Jun-bai, SHEN Jia-cong
    1992, 13(4):  542-545. 
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    The molecular diffusion coefficients of styrene-divinylbenzene ultrafine particles were measured by photon correlation spectroscopy in good (toluene) and θ(cyclohexane) solvents at various temperatures.The hydrodynamic radius and activation energy for diffusion were calculated.The experimental results show that the molecular morphology of St-DVB ultrafine particles changes hardly because of its crosslinking structure.In θsolvent,when T<θ, the particles aggregated and behaved as macromolecular cooperative diffusion; when T>θ, the diffusion coefficient was deviated from the linear relationship between Dand Cin high concentrations.The functions of hydrodynamics and thermodynamics controlled the diffusion behavior of the ultrafine particles.
    The Formation of Composites from Imidazolate Polymers with Epoxy Resins
    XUE Qi, MA Min, ZHANG Jun-feng, DAI Qing-ping, ZHOU Cui-wei
    1992, 13(4):  546-549. 
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    The chemical reactions of imidazole with metallic copper was studied by means of IRand XPS.The product is bisimidazolato copper, which covers the surface in the form of a polymeric film.The kinetics of the curing of epoxy resin with bis-imidazolato copper was investigated by DSC.The measurements of tensile shearing strength show that the adherence of copper or iron treated with azoles to epoxy resin is higher than the untreated ones.
    Some Characteristics of Multiblock Copolymers Containing Polyoxyethylene
    TAO Xu-quan, XIE Hong-quan, GUO Jun-shi
    1992, 13(4):  550-553. 
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    The phase transfer catalytic action and compatibilizing action of the (styrene-bu-tadiene-oxyethylene) multiblock copolymers and the conductivity of the complex of them with LiClO4 were studied.The results show that the LiClO4 complex of the multiblock copolymers shows a conductivity of about 4×10-4 S·cm-1 at 35℃.The multiblock copolymers possess a good phase transfer catalytic ability in Williamson reaction and can be used as compatibilizer in blending epichlorohydrin rubber with ABS.
    Studies on the Immobilization of π-Amylase by Radiation Polymerization
    YAN Wen-li, FENG Zhen-tai, CHEN Guo-hua, LIU Yi-ling
    1992, 13(4):  554-557. 
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    The present paper covers the immobilization of α-amylase onto PHEMA by radiation polymerization at low temperatures.The proper condition of the radiation polymerization was mainly investigated.The relative activity of transforming amylogen into reduced sugar and the stability of repeated application of immobilized enzymes obtained from different systems are discussed.The paper narrates the relationship between the relative activity and microhole of the polymer matrix as well.The experiments show that the best conditions are as follows: [E]≥250μg/mL,[M] = 30%～40%, T=-50～55℃, R=5.6×105 rad, vacuum system.The rela-tive activity of the immobilized enzyme got under the above conditions keeps higher than 30% even after being used for more than ten times
    Crossl inking of Br Terminated Poly (Ethyl ene Oxide) with Poly (Ethyleneimine) and Cationic Water Absorbent Resin
    LIU Qi-rong
    1992, 13(4):  558-560. 
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    The effects of composition of reaction system and the quantity of solvent on the yield of the crosslinking copolymer of Br terminated poly (ethylene oxide) (BrPEOBr) with poly (ethyleneimine)(PEI) were investigated.When 8.0 g BrPEOBr was reacted with 1.0 g PEIin 100 mL DMSO at 120℃ for 5 h, all the PEIcould be converted into crosslinking copolymer, and the conversion of BrPEOBr reached 94.3%.The copolymer (PEO-PEI) can absorb the deion-ized water 80 times its own weight.Further converting the copolymer into quaternary ammonium chloride, it can absorb the deionized water 250 times its own weight.
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