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    24 July 1992, Volume 13 Issue 7
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    Articles
    Studies on the Solidification of Sepiolite with the Addition of RE-USY Zeolite by Hydrothermal Hot-Pressing
    MENG Xian-ping, JI Tian-hao, ZHU Ding-hau, PANG Wen-qin, Nakamichi Yamasaki, Kazumichi Yanagisawa
    1992, 13(7):  873-876. 
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    In this paper, the sepiolite from Hunan province with the addition of RE-USY zeolite was solidified by the hydrothermal hot-pressing technique.The effect of hydrothermal hot-pressing conditions on the compressive strength, density, appearance,structure changing and surface acidity of the solidified bodies was investigated by means of XRD, SEM and IR.The results show that sepiolite can be solidified easily and the solidified bodies keep the framework structure of starting materials basically.The solidified bodies have Bronsted acid sites and Lewis acid sites, but the Bronsted acidity is very weak and the Lewis acidity is stronger than that before solidifying.
    Preparation and Structure Study of Pr(Ⅳ) Composite Oxides Ce0.8Pr0.2O2
    YANG Ying, YANG Ru-dong
    1992, 13(7):  877-879. 
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    Pr (Ⅳ) composite oxides Ce0.8Pr0.2O2 was prepared by means of ozonizing the co-precipitated Ce(Ⅱ)and Pr(Ⅱ) hydroxides or heating the coprecipitated Ce(Ⅱ) and Pr(Ⅱ) ox-alates.Chemical analysis and X-ray powder diffraction results show that this compound has a flourite structure similar to CeO2 and PrO2, but its crystal cell constants are different from theirs obviously.In this compound Pr(Ⅳ) is more stable than in pure PrO2, we can attribute this to the existence of Ce(Ⅳ), which makes Pr (Ⅳ)—O2- distance longer than in other Pr(Ⅳ) oxides.
    Studies on Adsorption Properties and Secondary Pore Structure of REUSY-Ex
    BAO Shu-lin, FU Jun, XU Qin-hua, CHEN Xue-da, YIN Ze-qun
    1992, 13(7):  880-883. 
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    The adsorption properties and secondary pore structure of REUSY-Ex were studied by using BETmethod (benzene and n-heptane as absorbates respectively) and N2 adsorption method.The hysteresis loops were observed in the isotherms of N2 adsorption on USY, REUSYand REUSY-Ex, which showed obviously that the secondary pores were produced in the process of hydrothermal treatment.The acid leaching could extract extra-framework aluminum species filled in the secondary pores and micropores of REUSY.The results of 29Si MAS NMR showed that the chemical surroudings of framework silicon are more uniform after acid leaching.
    Synthesis, Crystal and Molecular Structure of Cupric Dipyridyl(O,N) Glycyl-Glycinato-N-Cupric Bisdipyridyl Nitrate
    WANG Feng-shan, GUO Shi-shan, HUANG Dong-lu
    1992, 13(7):  884-888. 
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    A novel binuclear complex with Gly-Glyo as a intermediate radical was synthesized by the raection of Gly-Glyo 2, 2'-dipyridyl and cupric nitrate in aqueous solution.The structural formula of complex was confirmed as {[(C10H8N2)Cu(H2NCH2CONHCH2COO)Cu(C10H8N2)2](NO3)3} by X-ray single-crystal structure analysis.Crystallographic parameters of the complex crystal are as follows, a triclinic system with space group P1,a=1.4268 nm,6=1.17542 nm, c=1.4059 nm, α= 104.01°,β=91.56°,γ=72.22°,V=2.17569 nm3, Z=2.Diffraction data were collected on a Nicolet XRD R3 Diffractometer.The crystal structure was refined by block matrix least squares program to final R value of 0.070.
    Studies on the Solid State Reactions of Coordination Compounds(L)——Solid State Synthesis and Crystal Structure of [(n-Bu)4N]2[MoOS3(CuNCS)3]
    LANG Jian-ping, BAO Shi-an, ZHU Hui-zhen, XIN Xin-quan, CAI Jin-hua, WENG Lin-hong, HU Yong-han, KANG Bei-sheng
    1992, 13(7):  889-892. 
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    A dark red solid was obtained by heating the powder mixture of (NH4)2MoOS3, CuSCN, KSCN and (n-Bu)4NBr in the solid state.The obtained solid was processed with DMF/ CH2Cl2 to give a dark red rhombohedral crystal [(n-Bu)4N]2[MoOS3(CuNCS)3].The crystal belongs to monocline system with space group P21/n, a=1.6672(9) nm, b=1.6278(6) nm, c=1.9608(8) nm;β=110.05(4)°, Z=4.The title compound is one of Mo-Cu-Smixed metal cluster compounds with nido-like skeleton.The average distance of Mo-Cu is 0.2647 nm.
    A Novel Technique for Synthesizing Fullerene C60
    DAI Guo-rui, MICHAEL L. Hitchman
    1992, 13(7):  893-894. 
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    A novel technique for synthesizing fullerene C60 by using plasma enhanced chemical vapour deposition is first reported .We explored the preparation conditions of C60 from polynucle-ar compound as the precursor.The characteristic of mass spectra of C60 samples were studied by using EIMS (Electron Impact Mass Spectrometry) and FDMS(Field Desorption Mass Spectrometry) methods.The C60 molecular peak at m/z=720 and their isotopic peak were observed.There are some fragment peaks and other fullerenes of the samples in the diagrams.
    Studies on the Complexes of Rare Earth and Crown Ethers(ⅩⅪ)——Synthesis and Characterization of the Binuclear Solid Complexes of Rare Earth Elements with 1,8-Octamethylene-Bis(B15C5)
    ZHANG Bo-yan, TAN Min-yu, HUANG Shu, TIAN Bao-zhi
    1992, 13(7):  895-897. 
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    The 2:1(M:L) binuclear solid complexes 2RE(SCN)3·OBS·nTHF·mH2O(RE=La, Nd, Eu, Dy, Er; OBS= 1,8-Octamethylene- bis(B15C5);n=0, 1;m=1～4)were synthesized in THF.The composition and complexation manner of the complexes were established on the basis of elemental analysis, molar conductance,IRspectra.The thermal and fluorescent properties of the complexes were also studied.
    Determination of Trace Gold by Graphite Furnace Atomic Absorption Spectrophotometry with Preconcentration by Chemically Modified Electrode
    REN Yu-lin, ZOU Ming-zhu, ZHENG Yan-sheng, GUO Xiao-mei, NIU Shu-yun, LIU Xiao-xun
    1992, 13(7):  898-901. 
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    The inside wall of a graphite tube was modified with a thin film of polyacrylamidine thiocyanate.Trace gold was electrochemically preconcentrated by the graphite tube being soaked in its solution and then the determination of trace gold by graphite furnace atomic absorption spectrophotometry was carried out.It was shown experimentally that Ag,Ir, Rh, Pd and Ft did not interfere in the determination of Au, and a hundred fold enhancement in analytical sensitivity was found.The analytical sensitivity of the method (1% absorption) was 3.5×10-10 mol/L.The method was applied to the determination of trace gold in ore with a satisfactory result.
    Performance of a Computerized General-Purpose Electrochemical Instrument at Ultramicroelectrodes
    YU Jun-sheng, ZHANG Zu-xun
    1992, 13(7):  902-905. 
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    The features of a computerized general-purpose electrochemical instrument are described.Twelve kinds of basic electroanalytical modes can be used.Amplitudes of current signal as low as 10-11 A can be detected.Characters of potential and current measured are agreeable to the description of electrochemical theory.It is applicable to the electrochemical study and determination at ultramicroelectrodes and microelectrodes.
    Single-Sweep Oscillopolarographic Titration of Bilirubin and the Kinetics of the Reaction Between Cu(Ⅱ) and Bilirubin
    WANG Ju-li, PENG Zong-wen, LIU Qing, ZHOU Xing-yao
    1992, 13(7):  906-909. 
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    The chemical reactions of Cu(Ⅱ) and Co(Ⅱ) with bilirubin were investigated and the oscillopolarographic titration methods have been developed for the determination of bilirubin.The reaction mechanisms were studied and some kinetic parameters related to the reaction between Cu(Ⅱ) and bilirubin were measured.
    First Derivative Cyclic-Voltammetry at Ultramierocylinder Electrodes
    XU Tao, WU Zhi-bin, ZHONG Wen-ying, ZHANG Zu-xun
    1992, 13(7):  910-912. 
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    In this paper, the theory of first derivative cyclicvoltammetry at stationary ultrami-crocylinder electrodes is presented.The characters of the voltammogram curves are discussed.An experimental study was made with a JP3-1 type of oscillopolarograph at platinum wire ultra-microcylinder electrodes in K4Fe(CN)6 solution.The experimental results are in good agreement with the theory.
    Synthesis of Fluorescein Diphosphate and Its Analysis of Alkaline and Acidic Phosphatase by Fluorimetry
    GONG Guo-quan, WANG Liu-fang, ZHOU Yun-gao, LI Ying, WU An-xin
    1992, 13(7):  913-915. 
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    Fluorescein diphosphate was synthesized with fluorescein and phosphorus oxychloride.The diphosphate was applied to the fluorimetric analysis of alkaline and acidic phosphatase.The conditions of reaction of phosphatase with fluorescein diphosphate, linear range for the determination of the phosphatase, limitation of detection of the phosphatase and Michaelis constant were studied.
    Studies on the Oscillopolarographic Adsorptive Wave of Rare Earth Elements(Ⅲ)-DBF-Chlorophosphonazo Complex
    YAN Rong, SHI Wen-zhao, CAI Qian-tao
    1992, 13(7):  916-918. 
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    The oscillopolarographic behaviour and the current property of the title complex in NH4Cl solution have been investigated.Anew simple, sensitive and selective oscillopolarographic method has been established for the determination of a trace amount of total rare earths.The detection limit is 1.4× 10-8 mol RE(Ⅲ)/L.
    Studies on Monocyclic β-Lactams(Ⅰ)——Synthesis of 3-Hydroxy-4-Substituted-2-Azetidinones
    GUO Mao-jun, MIN Ji-mei, LI Ren-li, ZHANG Li-he
    1992, 13(7):  919-922. 
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    The facile stereospecific route is described for synthesizing of 3-hydroxy-4-substituted-2-azetidinones 6.The 2 + 2 cycloaddition of acetoxy acetyl chloride with imine derived from p-anisidine in the presence of triethylamine afforded 3-acetyloxy-4-substituted-l-(4-methoxy-phenyl)-2-azetidinones 3.When the substituents are aryl, aromatic heterocyclic and conjugated alkenyl, the cycloaddition products 3a-f were cis isomers, while alkoxy and sulfenyl, 3g, 3h were trans ones.The oxidation N-dearylation of compounds 3a-d by using eerie ammonium nitrate (CAN) gave 4a-d, which were deacetylated with saturated sodium bicarbonate in methanol at room temperature for 1 h to give 6a-d in good yields.However, under the same N-dearyiation condition, 3g, 3h and 3-hydroxy β-lactams 5 did not give the desired N-unsubstituted β-lactams.
    Studies on the Synthesis of Derivatives of Pyrazolo [3,4-d]-1,3,2-Diazaphosphorin-6-one
    CHEN Ru-yu, WANG Jian-wu
    1992, 13(7):  923-927. 
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    In order to look for biological active phosphorus heterocyclic compounds, taking isop-urine-pyrazolo[3, 4-d]-pyrimidine as the lead-compound, we designed and synthesized a new-type of compounds——the derivatives of pyrazolo[3,4-d]-l,3,2-diazaphosphorin-6-one.Fourtytwo of them have been obtained by using l-substituted-5-amino-4-pyrazole ester as the starting materials.The molecular structures of all the compounds were confirmed by 1H NMR, IR, MSand elmental analysis.The preliminary biological activities of the products indicate that some of them possess antitumor and pesticidal activities.
    Crystal Structure of 1:1 Adduct of 3,5-Dinitrobenzoic Acid and Diethanolamine
    ZHENG Ji-min, XIA Ai-bing, CHE Yun-xia, WANG Hong-gen, WANG Ru-ji
    1992, 13(7):  928-931. 
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    The title 1:1 adduct was prepared and a large single crystal with dimensions of 24 mm×15 mm×38 mm was obtained by slow-cooling method.It produces the green radiation at 512 nm under the irradiation of Nd3+ : YAGlaser beam at 1064 nm.The crystal structure of this potential non-linear optical material was studied by X-ray diffraction method.The crystal is triclinic, space group P1, with a=0.4609(2) nm, b=0.7405(5) nrn, c=l.0684(6) nm, α= 95.50(5)°, β=98.72(3)°, γ=104.33(5)°, Z=l; R=0.076.The molecules of 3,5-dini-trobenzoic acid and diethanolamine are connected to each other by intermolecular hydrogen bonds to form two-dimensional net-work which are parallel to the 001 plane.
    Synthesis of N-Alkoxypropionyl-1,3-thiazolidine-2-thiones
    HUANG Hua-min, JIAO Yu-guo, LI Ye-zhi, ZHANG Suo-bo, ZHANG De-sheng
    1992, 13(7):  932-935. 
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    3-Alkoxypropionyl-l,3-thiazolidine-2-thiones 2a-i were synthesized from 3-alkoxy-propionic acid and 1, 3-thiazolidine-2-thione by using cyanuric chloride as the condensing agent.Alkoxyethylphenyl ketones 3a,c-h were obtained by treatment of 2a,c-h with phenylmagnesium bromide 2a-i are new compounds.
    Studies on the Acylaminothiosemicarbazides and the Related Heterocyclic Derivatives(ⅩⅩⅤ)——Synthesis of-1-(2,4-dichIorophenoxylacetyl)-4-aroylthiosemicarbazides and Studies on Its cyclization Behavior Under Basic Catalysis
    ZHANG Zi-yi, LIN Hai-xia
    1992, 13(7):  936-939. 
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    In this paper, a series of new l-(2, 4-dichlorophenoxyacetyl)-4-aroylth-iosemicarbazides 3 were synthesized by the addition reaction of 2,4-dichlorophenoxyacetic acid hydrizide with aroyl isothiocyanate and the behavior of cyclization of compounds 3 in the presence of 2 mol/L KOHwere studied.The result shows that the reaction of compounds 3 in an alkaline medium gave 3-aryl-4H-l,2,4-triazoline-5-thione 4.The mechanism for the formation of compounds 4 was discussed.The structures of compounds prepared were characterized by elementary analysis, IRand MS.
    Rhus Vernicifera Laccase Catalyzes Oxidation of 2,6-Dimethylphenol
    JI Li-cai, HU Pei-zhi, XU Wen-zhong
    1992, 13(7):  940-944. 
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    Rhus vernicifera laccase catalyzes the oxidation of 2, 6-dimethylphenol(DMP) to 3, 3', 5,5' -tetramethyl-4,4' -diphenoquinone (TMDQ) in 0.1 rnol/Lphosphate buffer solution.The enzymatic oxidation of DMPis much faster at pH 8.0 and temperature 40～50℃.The reaction is a first-order and the rate constant (kobs) is 3.57× 10-5 s-1 when DMP concentration is in the range of 1.66 × 10-4～9.92 × 10-4 mol/L.The coexistent ferrocene (Fc-H) can more greatly promote the enzymatic oxidation of DMP.The possible mechanism of laccase-catalyzed oxidation of DMPand coexistent Fc-H was inferred.
    A New Triterpene Glucosyl Ester from Sanguisorba Alpina Bge
    JIA Zhong-jian, LIU Xiang-qian, LIU Zi-min
    1992, 13(7):  945-946. 
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    From the ethanolic extract of the roots of Sanguisorba alpina Bge(Rosaceae), a new tnterpene glucosyi ester, named alpinoside, was obtained and elucidated as 2α,3α-dihydroxyursa-12, 19(29)-diene-28-oic acid β-D-glucopyranosyl ester on the basis of EIMS, 1H NMR.13C NMR, DEPT, IR and chemical method.
    Studies on Macrocyclic Diterpenoids(Ⅳ)——Synthesis of Isosarcophytol-A Precursor
    LI Yu-lin, LI Wei-dong, LI Ying
    1992, 13(7):  947-949. 
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    3,7,11,15-Tetramethyl-12-tert-butyldiphenylsilyl ether-14-oxo-2E,6E,10E-hex-adecatrienal(11), the precursor of isosarcophytol-A, has been synthesized via six steps with (E, E)-farnesol (4) as starting material.The key steps in the synthesis are regionselective oxidation of farnesyl acetate (5) and aldol condensation of aldehyde 8 with methyl isopropyl ketone.
    A Simple Calculation Method for the Electronegativity of Nonconjugated Covalent Groups
    LI Ying, ZHANG Xing-chen, WU Jian-jun
    1992, 13(7):  950-952. 
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    The electronegativity Xof nonconjugated convalent groups can be calculated by the following formula  where X0 and Xi are respectively Pauling's electronegativity of its central atom and of the element or group connected to its central atom.That is the method of our progressive arithmetic mean.With this method, a number of the rules related to organic chemistry can be investigated.
    Resolution of TPD Spectra by Simplex Method
    HU Yun-hang, HUANG Ai-min, CAI Jun-xiu, WAN Hui-lin
    1992, 13(7):  953-955. 
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    According to Polangi-Wagner model, the TPDspectra were resolved quantitatively by simplex optimization method.The variance of spectrum peak height was adopted as an objective function in the method.The theoretical activation energy and pre-exponential factor were identical with the calculated ones.Good results have also been obtained for the overlapping double peaks.
    A Study of the Extraction of Gold(Ⅰ) with HDEHP or HEHEHP
    GUO Liang-qin, GAO Zi-li, SUN Si-xiu, SHEN Jing-lan
    1992, 13(7):  956-959. 
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    The extraction equilibrium and kinetics of glod (I) from aqueous thiourea and sodium chloride/di (2-ethylhexyl) phosphoric acid(HDEHP) or 2-ethylhexyl 2-ethylhexyl phosphonic acid (HEHEHP) in kerosene were investigated at 298±1 K.The mechanism of extraction equilibrium determined is the exchange of cation.The rate-determining step of kinetics may be occur at the interface between HDEHP and HEHEHP and belongs to interfacial reaction.
    A Study of Ion Kinetic Energy Spectrometry of Doubly Charged Ions and Singly Charged Ions of o-,m-,p-DimethylBenzenes in Gas Phase
    LI Zhi-li, LIU Shu-ying, PENG Jia-rou, ZHANG Hai-ying
    1992, 13(7):  960-963. 
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    With the Mass Analyzed Ion Kinetic Energy Spectrometry (MIKES) and Collision-Induced Dissociation (CID) techniques, the reactions of the doubly charged ions and singly charged ions from o-, m-, p- dimethyl benzenes in the El source have been studied.In terms of the values of the kinetic energy releases (T) of the charge separation reactions of the doubly charged ions and the estimated intercharge distances (R) of the splitting doubly charged ions in their transition structures, some structural information about the transition states can be obtained.It is interesting that MIKES/CIDspectrum of [C8H10]+·, singly charged ion of o-dimethyl benzene is different from those of the others two isomers.
    Studies on Thermokinetics of the Fractional Order Reactions——The Kinetics of the Polymerization of Acrylamide
    LIU Qing-hua, ZENG Xian-cheng, DENG Yu, LI Gan-zuo, XIA Rui, SHENG Da-cheng
    1992, 13(7):  964-967. 
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    The kinetics of the polymerization of acrylamide initiated by sodium sulfite in the aqueous solution and CTABmicellar solution is investigated with the theory and method of thermokinetics for the fractional order reactions in this paper.The influence of initiator and CTABconcentrations on the molecular weight of polyacrylamide is discussed.The ratio k2/n in CTABmicellar solution is smaller than that in the aqueous solution.The results obtained show that the rate of formation of radical in the micellar solution was decreased.
    Dynamic Studies on Accelerating Agents for Vulcanization on 13X Zeolites
    DUAN Xue, ZHU Ya-ling, SUN Peng
    1992, 13(7):  968-971. 
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    In this paper, the acid character on the surface of 13Xzeolites and the dynamic behavior of accelerating agents for vulcanization on 13X zeolites are studied by TPD.The results obtained show that there are differenet acid sites on the zeolites for the base adsorbates, such as Bacid, Lacid, mixing Band Lacids, and weak chemical adsorption.The effective sites on the surface for adsorption is the sites of weak chemical adsorption for slow-release cross linked agents of adsorption type.It is obtained that different accelerating agents of vulcanization have different dynamic character for their desorption from the surface of 13X zeolites and there is a crystal diffusion in the desorption.
    Studies on Thermokinetics of Reversible Reaction Kinetics——Mathematical Models and Studying Methods
    ZENG Xian-cheng, LIU Qing-hua, DENG Yu
    1992, 13(7):  972-976. 
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    Based on the theory and method of thermokinetics proposed in previous articles, two kinds of mathematical models and studying methods for the reversible reaction kinetics are suggested in this paper.The thermokinetics for the reversible reaction between ammonia and ni-troethane has been studied at 25 and 30℃ by using the two kinds of models and methods.The results indicate that the two kinds of mathematical models and studying methods for the reversible reaction kinetics are believed to be correct.
    Application of Fourier Transform Infrared Photoacoustic Spectroscopy to Porphyrin Studies (Ⅰ)——Fourier Transform Infrared Photoacoustic Spectra ofTransitional Metal Porpbyrin Complexes
    SHI Tong-shun, ZHANG Yuan-fu, YU Lian-xiang, CAO Xi-zhang
    1992, 13(7):  977-980. 
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    The Fourier transform infrared photoacoustic spectra of tetra-(p-nitrophenyl) porphyrin and its Cr(Ⅲ), Mn(Ⅲ), Fe(Ⅲ) Co(Ⅱ),Ni(Ⅱ), Cu(Ⅱ) and Zn(Ⅱ) complexes in the range of 3500—225 cm-1 were measured and investigated.The bands at 3324 cm-1 and 968 cm-1 are N-Hvibrations of pyrrole.The bands at 986 cm-1, 799 cm-1, 737 cm-1 and 629 cm-1 are the vibrations of porphyrin ring.The bands at ～3109, ～1600, ～1520,～1350, ～850, ～825 and ～744 cm-1 result from p-nitrobenzene of the porphyrin.Metal sensitive bands were found at ～1489, ～1076, ～737 and ～245 cm-1.
    ESR Imaging of Paramagnetic Defect Centers in Quartz Glass
    ZHENG Ying-guang, SHEN Er-zhong
    1992, 13(7):  981-984. 
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    The spatial distributions of paramagnetic defect centers Fcenters in quartz Dewar after UV-irradiation were detected by ESRimaging method.It has been shown that the spatial distributions of Fcenters in the quartz Dewar are non-uniform from ESRspectrum with magnetic field gradient and 2-D ESRimages.The concentration of Fcenter is colsely related to the irradiation direction and density.The geometric size of the cross section of Dewar obtained by calculating ESRdiscrete point map of Fcenter is in agreement with the material object.
    Studies on the Oxygen Enrichment of Chitosan Membranes(Ⅰ)
    DING Jun-qi, ZOU Wei, HE Xu-min, XIA Hai-ping, DING Ma-tai, CAI Qi-rui
    1992, 13(7):  985-986. 
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    The composite membranes of chitosan and polysulfone amide were obtained.The damp membrane can enrich oxygen from air, while dry membrane can not do so.The effects of temperature and operating pressure were studied.
    Studies on Kinetics of the Competition Between Chelating Agents and Bovine Serum Albumin for Nd(Ⅲ)
    ZHANG Bao-lin, WANG Wen-qing, WU Yong-hui
    1992, 13(7):  987-989. 
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    The competition kinetics of six chelating agents(DTPA, EDTA, NTA, Cit, His, Cys) with bovine serum albumin(BSA) for the labeled neodymium (147Nd(Ⅲ)) was studied by the Centrifugal Ultrafiltration method.The parameter A, which is defined as the dissociation percentage of Nd(I) bound to BSAin the presence of chelating agents, can be used as the criterion for the estimation of the mobilizing ability of chelating agents.Avalues determined experimentally lead to a mobilizing ability order: DTPA>EDTA>NTA>Cit>His>Cys.The experimental results show that the polyaminopolycarboxylated type chelating agent especially DTPAand EDTA, are stronger than the others.The kinetics of these reactions has been studied at pH 6.30 and the mechanism is elucidated.It is found that the reactions of DTPA, EDTAand Cit with BSA·Nd (Ⅲ) follow the association mechanism, but those of NTA, His and Cys, the dissociation mechanism.The kinetic constants were determined respectively.
    Crystallization of Nylon 6 in the Presence of PBA
    LIN Jia-ping, WU He-rong, LI Shi-jin
    1992, 13(7):  990-993. 
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    Crystallization kinetics of nylon 6 in the presence of poly (p-benzamide) (PBA) was investigated by using the Depolarized Light Intensity (DLI) technique.The experimental results of the crystallization isotherms show that n values, according to the Avrami's equation, are 3.3 for nylon 6 and 1.6, 1.7 for nylon 6 containing 1 and 2 wt% PBA, respectively.This indicates that the introduction of PBA into the nylon 6 matrix could change the type of nucleation and growth, while the PBA acts as nuclei.The results of DSCshow an increase in crystallinity of nylon 6 matrix with the increase of PBA contents.X-ray diffraction analysis of the crystalline nylon 6 in the presence of varying content of PBA was performed.Experimental data show that no changes of molecular unit cell structure occured.The PBA could just change the type of crystallization, and acts as nuclei.
    Pressure Induced Phase Transitions of PTFE at Room Temperature
    WANG Jin, YANG Mei-lin, SHEN Jia-cong, ZHAO Yong-nian, CUI Qi-liang, ZOU Guang-tian
    1992, 13(7):  994-997. 
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    The pressure induced phase transitions of PTFEat room temperature was investigated by employing Laser Raman spectra.The Raman spectra of PTFEshowed distinct changes when Ⅳ- Ⅱ phase transition and Ⅱ - Ⅲ phase transition occur on the effect of pressure.The corresponding confofmational changes were also discussed.Ⅱ -Ⅲ Transition is verified by analysis the compression data with Tait equation and Murnaghan equation.The mode Gruneisen parameters of high pressure phase Ⅲ are first calculated.
    Analysis of Linear PS in Microgel Core/Shell Polystyrene Microparticle by TLC,GPC and TLC Scanning
    LI Ze-wen, YANG Bai, YU Wei-zhong, SHEN Jia-cong, DONG Lu-lu
    1992, 13(7):  998-1001. 
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    Thin-layer chromatography(TLC) and GPC were used to analyze linear PS in the mi-crogel core/shell polystyrene microparticle.Linear PSwas separated from crosslinking component by TLC, its molecular weight (MW) is 104～105 by GPC.The content of linear PSin the sample can be calculated directly with the area value of TLCscanning, when the weight of the sample was controlled under 1.6× 10-6 g; Combining the MW and content of linear PS with apparent viscosity of the sample, structure of the particles was analyzed qualitatively.
    Effect of Carbonyl Groups in Charge Transfer Complex and Determination of Complex Stoichiometry
    DONG Yu-ping, FENG Lin-xian, YANG Shi-lin, SHEN Jia-cong
    1992, 13(7):  1002-1005. 
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    The report researched the effect of carbonyl groups in charge transfer complex by means of NMR, in which succinic anhydride was taken for a model compound of maleic anhydride, and complex stoichiometries of succinic anhydride-styrene, succinic anhydride-N-vinylcar-bazole were determined through amendment of Hanna-Ashbaugh equation.The experiment results indicate that carbonyl groups were easier to participate in complex reactions than olefinic groups.
    Studies on Novel lmmobilized β-CycIodextrin Polymer for Removal of Endogenous and Exogenous Toxins
    HE Bing-lin, ZHAO Xiao-bin
    1992, 13(7):  1006-1007. 
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    Immobilized β-cyclodextrin polymer was used as medical sorbent for removal of exogenous toxins such as-phenol, aromatic amines, barbitals and endogenous toxin as unconjugated bilirubin.The results show that the adsorption capacity for these toxins can be enhanced due to the inclusion interaction between β -cyclodextrin and the substrate molecule.
    Studies on Kinetics of Deacetylation of Chitin in Heterogeneous Alkaline Solution
    CHEN Bing-ren
    1992, 13(7):  1008-1009. 
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    The kinetics of the deacetylation of chitin in the heterogeneous alkaline solution was studied.The results show that the kinetics of deacetylation of chitin conforms to a pseudo first order.The apparent activation energy of deacetylation was found to be 35.63 kJ/mol.
    Graft Copolymerization of Nylon 66 with Methyl Methacrylate——Using Dimethylaniline CuSO4 Initiator System
    WANG Yu-dong, ZHAO Qing-xiang, LIU Min-ying, LI Qing, LIU Xiao-hua, LI Xiang-kui
    1992, 13(7):  1010-1012. 
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    The ability of dimethylaniline(DMA)/CuSO4 initiator to induce grafting of methyl methacrylate(MMA) onto nylon 66 was investigated under different conditions.It was found that copolymerization reaction is greatly influenced by the temperature and time of the reaction, concentrations of MMA and DMA.The graft yield increases as the monomer concentration increases, there are optimal concentrations of DMA and Cu2+ ion, below or above these concentrations, lower grafting occurs.Raising the reaction temperature and increasing reaction time favorably influence grafting.The types of cupric salt also affect grafting to varying degrees.Addition of acetic acid enhances grafting, whereas formic acid decreases grafting.
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