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Table of Content

    24 June 1991, Volume 12 Issue 6
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    Articles
    Synthesis and Characterization of Potassium 2:17 Molybdophosphate
    Wang En-bo, You Wan-sheng, Liu Jing-fu, Hu Chang-wen
    1991, 12(6):  711-714. 
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    The K10P2Mo17O61·16H2O was synthesized by the improved method. The IR, UV and oxidation-reduction were discussed. It is inferred that the structure of the compounds is a2-isomer. The hole makes the oxidation-reduction irreversible. The thermal stabillity and X-ray powder diffraction of the compounds were also studied.
    Synthesis and Identification of M-ZSM-12 Zeolites
    Wang Wei-li, Pang Wen-qin
    1991, 12(6):  715-718. 
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    M-ZSM-12(M=B, Ga, Ge)Zeolites were synthesized from a mixture containing triethylmethylammoniumbromide as template agent in a basic medium. The factors affecting the synthesis were investigated. M-ZSM-12 were charaterized by means of XRD, SEM, IR, XPS, 29Si MAS NMR, and DTA, which proved that M was situated in the zeolites framework.
    Studies on Synthesis for 1-Phenyl-3-methyl-4-(β-benzoylocetyl) pyrazolone-5 and Its Equilibrium of Keto-Enol Tautomerism
    Kong Bi-xia, Li Yuan-ying, Yang Yan-sheng
    1991, 12(6):  719-723. 
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    Anew compound, 1-Phenyl-3-methyl-4-(β-benzoylocetyl) pyrazolone-5 was synthesized by acylation. Its composition and molecular weight were confirmed by elemental analysis and mass spectrometry. The presence of the enol-chelating form at the side chain, 4-(β-benzoyllacetyl) was indicated by IR, UV and 13C NMR, and also confirmed by X-ray crystal analysis. The equilibrium of keto-enol tautomerism for this compound was investigated by UVspetra and also by 1H NMR emphatically.
    Synthesis and Properties of μ-Oxamido Heterobinuclear Cu(Ⅱ)-Co(Ⅱ) Complexes
    Liao Dai-zheng, Zhang Zhi-yong, Jiang Zong-hui, Hao Song-qi, Wang Geng-lin
    1991, 12(6):  724-727. 
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    Three heterobinuclear complexes were synthesized, namely Cu(oxpn)Co(L)2(ClO4)2·xH2O (L=2,2'-bipyridyl (bpy), 1, 10-phenanthroline (phen), and 5-nitro-1,10-phenanthroline (NO2-phen), where oxpn is N, N'-bis(3-aminopropyl)oxamido. Based on IR, elemental analyses, conductivity measurement and electronic spectra these complexes are proposed to have extended oxamido-bridged structure and to consist of Cu(Ⅱ) in a planar environment and Co(Ⅱ) in an octahedral environment. The cation symmetry is very close to C2v. The complexes were characterized with variable temparaturo magnetic susceptibility (4～300K) and the data were fitted with the least-square to the susceptibility equation derived from spin Hamilton,.The exchange integral, J, was found to be -22.36 cm-1(for bpy); -15.45 cm-1(for phen);-19.10 cm-1(for NO2-phen), indicating that a weak antiferromagnetic spin-exchange interacts between the metal ions.
    Solubility Measurement of the Ternary Systems 4-ClCH2COAP-La (NO3)3-H2O and 4-ClCH2COAP-LaCl3-H2O (30℃)
    Xu Xing-ling, Tang Zong-xun, Guo Zhi-zhen, Chen Yun-sheng
    1991, 12(6):  728-730. 
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    The solubilities and the refractive indexes of saturated solutions of the ternary systems 4ClCH2COAP-LaY3-H2O(Y=NO3-, Cl-) at 30℃ were studied and the corresponding equilibrium diagrams were constructed. The solubility curves and refractive index curves of nitrate systems consist of three branches, corresponding to 4-ClCH2COAP, La(4-ClCH2COAP)2(NO3)3 and La(NO3)3·6H2O. The ternary complex is incongruently soluble in water. The eutectic compositions are: La(NO3)3 49.80%, 4-ClCH2COAP0. 85% and La(NO3)3 60.63%, 4-ClCH2COAP 0.56%. The system of chloride is a simple one. The eutectic composition is LaCl3 48.39％, 4-ClCH2COAP 0.28%. The IRspectra and the X-ray powder diffraction of the ternary complex were studied too.
    Studies on Polarographic Adsorption Wave of Lead-Strontium-Chlorophosphonazo Ⅲ Complex and Its Analytical Application
    Cai Qian-tao, Peng Zhang-zhu, Shi Wen-zhao
    1991, 12(6):  731-734. 
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    In the solution of NaNO2, the complex of Pb2+-CPAⅢ(chlorophosphonazo Ⅲ) gives a polarographic adsorptive wave which is relative to [Pb2+] at-0. 60 V(vs. SCE) in single-sweep oscillopolarograph. The presence of Sr2+ion results in an increase of sensitivity, a good stability and negative shift of the peak potential to -0.61 V(vs. SCE) under certain conditions, and a new sensitive method for the determination of trace lead by this polarographic adsorptive wave is thus established. The detection Limit of this method is 1.0 ×10-6 mol/L Pb2+.
    Studies on Determination of Trace Gold by Trioctylphosphine Oxide Modified Electrode
    Lu Guang-han, Zhu Min, Jin Li-tong, Fang Yu-zhi
    1991, 12(6):  735-737. 
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    Apreconcentration determination method for gold(Ⅲ) in 1mol/L HCl solution with Trioctylphosphine oxide(TOPO) modified glassy carbon electrode is proposed. There is a good linear relationship between the concentration of gold(Ⅲ) and the peak height in the range of 1～20 ng/mL for glod(Ⅲ). The mechanism for electrode reaction and the condition for determining gold(Ⅲ) are discussed.
    Studies on Reciprocal Derivative Constant-Current Stripping Analysis with a Spheric Mercury Film Electrode
    Ruan Xiang-yuan, Deng Jian-cheng, Zhao Hong-bin
    1991, 12(6):  738-741. 
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    Atheory of reciprocal derivative constan-current stripping analysis (RD-CCSA) with a spheric mercury film electrode(SMFE) is deduced and verified in this paper. The experimental resul sare in agreement with the theoretic ones. The condition of application for the theory is that the thickness of mercury film is not more than 4.6×10-4cm. The effect of noise on the sensitivity Of RDCCSAis also discussed in some detail.
    Studies on the Rule of Selectivity Coefficients of Ion-Selective Electrodes with Crown Ethers Neutral Carrier
    Yang Yun-hui, Xi Zhi-wen, Tian Bao-min, Huang Shu
    1991, 12(6):  742-744. 
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    In this paper, a formula lgKjzpot=-A[(rj/zj-C]2-B(A, B, C: constants; rj: radius of the interfering ion; zj: charge of the interfering ion) is given which describes the dependence of selectivity coefficients of crown ether electrode on rj/zjof interfering ions by means of potassium electrodes based on eleven alkanodioyl polymethylene and 2, 2'-dihydroxy polymethylene bis ( 4'-benzo-15-crown-5). The results of response of Li+, Ba2+, Ag+, Rb+, Cs+of electrodes/with four polymethylene bis(4'-benzo-15-C-5) as the neutral carriers proved by the above formula was correct.
    Studies on the Simultaneous Determination of Rare Earth Mixtures by Free Floating Factor Analysis in a Dual Colour Developing System
    Shi Hui-ming, Ren Hong-ji, Meng Feng-lin, Ma Xue
    1991, 12(6):  745-747. 
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    The principle of free floating factor analysis (FFFA) is described. In the dual colour developing system of RE-TBA and RE-MTB-CPB, we successfully determined the four component rare earth mixtures of La, Sm, Dy and Lu simultaneously using this method. The optimum conditions for the simultaneous determination of the four elements are also discussed.
    Determination of Heavy Rare Earth Mixtures with Differential Kinetics-Factor Analysis
    GU Zhi-cheng, Xu Liang
    1991, 12(6):  748-750. 
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    The kinetic behavior in the substitution reactions of heavy rare earth-arsenazo Ⅲ complex with CyDTA has been studied by an on-line spectrophotometer. Several binary and ternary mixtures of heavy rare earth elements were determined by differential simultaneous kinetics and the data were analyzed by the factor analysis. The result is satisfactory if the binary or ternary mixtures do not contain adjaeent rare earth elements.
    New Chromogenic Reagent Arsenazo DBF Used for Spectrophotometric Determination of Rare Earth Elements
    Zhang Hua-shan, Li Qing-ge
    1991, 12(6):  751-753. 
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    The present paper reports the synthesis of arsenazo DBF, its characteristic, its reaction with rare earths ions and its application to the selective determination of cerium-group in aluminium-alloy. Arsenazo DBF, 2-(2-arsonophenylazo)-7-( 2, 6-dibromo-4-formylphenylazo )-1,8-dihydroxynaphthalene-3,6-disulfonic acid reacts with cerium-group rare earths to form blue-green colour complexes in NaAe-HCl aqueous solution at pH 2.2.The absorptive peak is at 630 nm. The molar absorptivity of La complexe is 1.3×105 L·mol-1·cm-1. Beer's law is obeyed over the concentration range 0～12μg/25mL of La.
    Studies on Polarographic Behavior of 1,4-Dithiothreitol
    Zeng Bai-zhao, Zha Jian, Zhou Xing-yao
    1991, 12(6):  754-756. 
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    In ClCH2COOH medium, 1,4-dithiothreitol (DTT) can shows a sensitive polarographic wave at -0. 31 V (vs. SCE). In this paper, conditions are found for the determination of 1,4-dithiothreitol with single sweeping polarography. Under the best condition the detection limit is 8×10-8 mol/Land the linear range of 1.1×10-7～5×10-5 mol/Lis exhibited. The polarographic character of DTT is investigated, the polarographic wave resulted from DTT shows the properties of adsorptive catalysis wave. The electrode reaction mechanisms are discussed in the paper and the effect of Cu2+on the polarographic wave is also studied.
    Studies on the Chemical Constituents of the Agapetes Plants(Ⅱ) Studies on the Chemical Constituents of the Agapetes hosseana Diels
    Deng Jian, Chen Yu-shu
    1991, 12(6):  757-760. 
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    Seven compounds were isolated from the Agapetes hosseana Diels. On the basis of IR, 1H NMR, 13C NMR, MSspectroscopic analysis and preparation of derivatives they were identified as urs12-en-2β-ol-28-oic acid(Ⅰ), 6β-hydroxyursolic acid(Ⅱ), fernenol(Ⅲ), 3β-friedelanol( Ⅳ), βsitosterol (Ⅴ), daucosterol (Ⅵ) and β-sitosterol glucutonide(Ⅶ). Compound (Ⅰ) is a new compound.
    Synthesis and Properties of 1,2,3-Diazaphosphole
    Chen Ru-yu, Liu Lun-zu, Cai Bao-zhong, Li Guo-wei
    1991, 12(6):  761-764. 
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    Aseries of 2-acetyl-1,2,3-diazaphospholes were synthesized and the structures of these compounds were determined by 1H, 13C, 31P NMR and MS. The relationship between the structure and properties is also discussed.
    Combination of Air Flask with Resin Spot Technique for Microgram Detection of Nitrogen, Sulfur and Halogen in Organic Compounds
    Zuo Yu-min, Xu Xiao-wen, Hu Cheng-wen, Zhang Lin-yuan
    1991, 12(6):  765-767. 
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    Seven kinds of resin reagents have been prepared. These resin reagents have been successfully applied to the detection of nitrogen, sulfur and halogen in organic compounds which were previously decomposed by means of air(oxygen) flask method. The detection limits(μg) are NO3- 0. 023, SO42- 1. 2, F- 0. 03, Cl- 2.1, Br- 0. 05 and I- 0.9 respectively. The false test for nitrogen has been studied.
    Studies on Macrocyclic Diterpenoids(Ⅱ) --Synthesis of the Precursor Compound of (±)-Cembrene-A
    Li Ying, Mao Jian-min, Li Yu-lin, Liang Xiao-tian
    1991, 12(6):  768-770. 
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    Aprecursor (3) of (±)-Cembrene-A, (E, E, E)-2,6, 12-trimethyl-9-isopropenyl-2, 6, 12-tetradecatriene-1,14-diol, was prepared from geraniol through 7 steps.
    Synthesis of (4S, 5R)-5-Hydroxy-4-Decanolide, the Autoregulator of Blood Cancer from Streptomyces Griseus
    Lu Zhong-e, Sun Da-qins, Chen Ke-qian, Xu Hai-jian
    1991, 12(6):  771-773. 
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    (4S, 5R)-5-hydroxy-4-decanolide 1, the proposed autoregulator of blood cancer from Streptomyces griseus was synthesized from an allyl alcohol 2, employing the Sharpless kinetic resolution and the reaction of diethyl malonate with epoxy compound 4 as two key steps.
    Studies on the Chemical Constituents of Piptanthus Concolor Harrow
    Liu Zi-min, Jia Zhong-jian
    1991, 12(6):  774-776. 
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    From the whole plants of Piptanthus concolor Harrow(Leguminosae), a new alkaloid, 5-α-hydroxyl-7, 17-dehydroisolupanine (Ⅴ), and other four known compounds, thermopsine (Ⅰ), anagyrine (Ⅱ), cytisine (Ⅲ) and β-sitosterol (Ⅳ) were isolated. Their structures were identified on the basis of EIMS,1H NMR,13C NMR,DEPT, IRand UVdata and the comparison with the authentic samples. Meanwhile, the results of this study support the close relation among the genera, piptanthus, thermopsis and ammopiptanthus in chemotaxonomy.
    Oxido-Rearrangement of Silyl Enol Ethers of Flavanones to Isoflavones
    Li Liang-zhu, Rui Yuan-jin
    1991, 12(6):  777-779. 
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    Reaction of silyl enol ethers of flayanones (I) with PhIO-BF3 results in oxido-rearrangemerit of the aryl from C2 to C3 to yield isoflavones(Ⅱ). The position of Rmay be retained. The yields of Ⅱ are about 70％.
    The Syntheses of Organogermanium Sesquioxides and Sesquisulfides
    Sun Li-juan, Wu Yu-sheng, Bai Ming-zhang
    1991, 12(6):  780-782. 
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    Eight new organogermanium sesquisulfides and sesquioxides were synthesized by improved method and their intermediates were also separated. The structures of these compounds were identified by elemental analysis, IR, and 13CNMR determination. The inhibition of the compounds SG-f, SG-h against IMC carcinoma was significant.
    The Rotational Tautomerization and Proton-transfer Reaction of 2-(2'-Hydroxyphenyl)-benzoxazole
    Liu Tian-hua, Feng Ji-kang, Zhang Xiao-feng, Li Zhi-ru
    1991, 12(6):  783-786. 
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    Using INDO series methods, a theoretical study of rotational tautomerization and protontransfer reaction of 2-(2'-hydroxyphenyl)-benzoxazole have been done. The potential energy surface, barrier, transition state have been obtained, and we assign the absorption and fluorescence spectra of related compounds theoretically. All calculated results are in good agreement with experiments. Then the mechanism of photo-chemical reaction and the possibility of applications are discussed.
    A Theoretical Study on the Electronic Structure and UV Spectrum of Footballene
    Li Jun, Feng Ji-kang, Li Zhi-ru, Wang Zhi-zhong
    1991, 12(6):  787-790. 
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    The electronic structrue and UVspectrum of Footballene have been examined by the use of INDO/2 and INDO/CI methods. After geometry optimization, we get two different kinds of distance: R5-6= 1.4507Å and R6-6=1. 3979Å, and the corresponding bond orders are 1. 1356 and 1. 4385 respectively. SCFcalculation gets 120 bonding and 120 anbonding MO, which satisfy the structural rule suggested by us. The calculated spectrum.of footballenc just has only one transition which has oscillator strength different from zero. It is at 386. 0 nm and in good agreement with experimental UV spectrum.
    A Theoretical Study on the Electronic Structure and UV Spectra of Different Mass Cn Cages
    Li Jun, Feng Ji-kang, Li Zhi-ru, Wang Zhi-zhong
    1991, 12(6):  791-794. 
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    The electronic structrue and UVspectra of C24, C50, C60 and C70 have been investigated by use of the INDO/2 and INDO/CI methods. The stability order is C60～C70>C50》C24. From C60, as the center, to other Cn, clusters in two sides, the UV spectrum shows red shift.
    A Theoretical Study of Electric Dipole Transition Intensity of the TbP5O14Compounds Emission Spectrum
    Huang Ai-ping, Li Bo-fu, Sun Jia-zhong
    1991, 12(6):  795-798. 
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    Taking account of the perturbation of an odd crystal field, we derive an oscillator intensity formula describing electric dipole transition of rare earth compound spectra, and extend the famous JOtheory by our formula. Acalculation is performed for emission spectrum intensities of 5D4→7FJ(J=1,2,6) of TbP5O14 crystal. The results agree basically with the experimenttal results.
    Salt Effect of Vapor-Liquid Equilibrium in the System of Formic Acid-Acetic Acid-Water Containing Magnesium Chloride
    Xu Qin-tang, Luo Ru-yi, Kang Hong-ye, Li Xi, Jiang Fu-ming
    1991, 12(6):  799-802. 
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    Using the apparatus--the Otsuiki-Williams still, the vapor-liquid equilibrium data for the systems of formic acid-water, acetic acid-water, formic acid-acetic acid, formic acid-acetic acidwater with and without salt were measured, respectively. Isobaric vapor-liquid equilibrium phase diagrams at the pressure of 9.866×104 Pa for these systems are ploted. The results obtained show the salt effect is obvious in all cases.
    Effect of Micro-Modifier La on Solidification Process of
    Wang Zi-chen, Zhang Li-hua, Wang Xiao-hui, Ma Wei, Zhao Mu-yu
    1991, 12(6):  803-805. 
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    The influence of La on the solidification process of Al-Si alloys was systematically invcstigated by differential thermal analysis. The results obtained show that La in the melt increases the primary α(Al) nucleation temperature and retards the primary silicon nucleation and growth.
    An Expression of Absolute Electrode Potential of Hydrogen Electrode Reaction
    Zhang Lin-shao
    1991, 12(6):  806-808. 
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    The object of this paper is to give an expression of the absolute electrode potential of hydrogen electrode reaction which is obtained from the electron transition condition expression of the hydrogen electrode reaction of the thermal activation theory extended in the compact double layer and the expression is expressed as where c is the activation energy of the chemical reaction and μis the chemical potential of the electron in metal.
    Rare Earth Ion Exchange Equilibria in Y Zeolites with Varying Ratios of SiO2/Al2O3
    Zhang Yu-qing, Du Jin-zhou, Zhao Ai-min, Li Quan-chang, Tao Zu-yi
    1991, 12(6):  809-813. 
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    Four Yzeolites with varying ratios of SiO2/Al2O3 were prepared. Athermodynamic study was made on the Na→Tb exchange reactions in these zeolites at 303 and 333 K. The thermodynamic equilibrium constants lnK., the standard free energy decreases -△G°, the standard enthalpy changes △H°,the standard entropy changes △S°of the exchange, and the activity coefficients and the excess free energies in the zeolites were determined. The dependences of these values on the charge density are reasonably explained by the double electric layer theory.
    Studies on Mechanism of the Reactions of Substituted Alkyl Phenyl Ketones with t-Butylmagnesium Chloride
    Gong Yue-fa, Qu Yian-ling, Zhao Cheng-xue
    1991, 12(6):  814-818. 
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    We have directly observed twelve ketyl radical intermediates 4～6[ArC(R)OMgX) formed during the reactions of a series of alkyl aryl ketones 1～3(Ar: 2,5-dimethylphenyl (1); 2,5-dimethoxyphenyl(2); 4-t-butyl-2, 5-dimethoxyphenyl (3) with t-butyl magnesium chloride by means of EPRtechnique. The product analysis shows that the major products formed in the reactions of alkyl 2,5-dimethylphenyl ketones la-d (R:a, Me; b, Et; c, i-Pr; d, t-Bu) are reduction products 7 and 1,2-addition products 8. The lower polarity of the used solvent and the lower reaction temperature would favour the formation of 7. In accordance with these results, the possible mechanisms for the titled reactions are discussed.
    The Effect of Charge Transfer Between Substituted Groups on Molecular Nonlinear Second-Order Optical Susceptibilities
    Feng Ji-kang, Gao Xu-ling, Li Jun, Sun Jia-zhong
    1991, 12(6):  819-821. 
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    The nonlinear second-order optical susceptibilities βx of some substituted benzenes: aniline, nitrobenzene, o-nitroaniline, p-nitroaniline and 2,4-dinitroaniline were calculated. Then the effects of charge transfer between substituted groups on molecular nonlinear second-order optical susceptibilities were discussed. The conclusion is thatβ′=βadd+βct is not a good formula for the calculation of β, although the idea of contribution of charge transfer between substituted groups for β is still a considerable useful concept.
    Studies on Thermokinetic Equation of Enzyme-Catalytic Reaction
    Mei Fu-ming, Wu Ding-quan, Qu Song-sheng, Du Yu-min, Zhan Dong-feng
    1991, 12(6):  822-824. 
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    The thermokinetie equation in the enzyme-catalytic reaction of the single substrate is suggested from the integral of the rate equation and the relationship between the variation of energy and the amount of reactants in the reaction and is tested with the hydrolysis reaction between arginine and arginase. The calculated values of the Michaelis constant Km and the maximum rate Vmax are 4.98×10-3mol/Land 2.33×10-5 mol/L·s, respectively, in agreement with those in the literature.
    Promotion of ZrO2to CuO-ZnO-ZrO2Catalyst for Methanol Synthesis at Low Pressure
    Xu Zheng, Qian Zai-hu
    1991, 12(6):  825-826. 
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    The promotion of ZrO2 to CuO-ZnO-ZrO2 catalyst for methanol synthesis at low pressure was studied through the analyses of products and the measurement TPD-MS. The results show that the addition of ZrO2 increased the yield of methanol.
    DTA-GC Combination for Measuring Adsorption Heat--The Investigation of Differential Heat of Adsorption for Pyridine on γ-Al2O3and NaX Zeolites
    Liu Chao-gang, Hu Ji-hua, Zheng Zhong
    1991, 12(6):  827-829. 
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    The differential heats of adsorption for pyridine on γ-Al2O3 and NaX zeolites at 170℃～270℃ have been measured by a DTA-GCadsorption calorimetric system we designed. It is verified that the acidic sites on the surface of γ-Al2O3 are mainly L-acid sites. The acid amount would be reduced and the acid strength would be decreased as the temperature is raised. The decreasing extent of the acid strength at one adsorption site is not the same as that at another. There are two types of acidic sites which adsorb pyridine irreversibly and reversibly on the surface of NaX zeolite. The stronger type is the non-active L-acid site and the weaker one the active B-acid site. The Influence of the temperature variation upon the two types of acidic sites is not the same. The calculation result shows that the total adsorption sites in β-cages and octahedral zeolite cages are partly occupied by H2O molecules.
    The Catalytic Behavior of 1,1′-Bis(Benzylthio)ferrocene Platinum, Rhodium Complexes in the Hydrosilylation of Olefins
    Chen Yuan-yin, Ni Ji-jin, Yao Jun-zhi
    1991, 12(6):  830-832. 
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    A new kind of catalyst, 1,1-bis(benzylethio)ferrocene platinum and rhodium complexes, for the hydrosilylation were synthesized and their catalytic behaviour for the hydrosilylation of olefins, including decene, dodencene, allyl benzene, phenyl allyl ether and allyl glycidyl ether, with triethoxysilane was studied under the atmosphere pressure and at the temperature between 70～100℃.
    Factors Affecting the Induced J-aggregation of the Ionic Cyanine Dyes in Aqueous Solutions by J-aggregates of Ionic Cyanines with Opposite Charges
    Zhou Jin-wei, Shen Jie-ru
    1991, 12(6):  833-835. 
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    The induced formation of J-aggregates of ionic cyanines by the J-aggregates of ionic cyanines with opposite charges was studied by vis-absorption spectra in aqueous solutions at room temperature. It was found that the induction effect was more pronounced by dye aggregates than by polyelectrolytes. It was also found that the addition of a polyelectrolyte or an inorganic salt together with the aggregation inducing J-aggregates would reduce the induction effect of the latter owing to the partial depression of its charge. Efficiently inducing action was favored when the two cyanines have closely related structure to facilitate the formation of compatible segregated J-stacks of the two ionic dyes. Amodel with the structural compatible totality of segregated J-stacks for the two oppositely charged ionic cyanine dyes was proposed from the results.
    Studies of Cyclic Polysilanes Containing Active Group
    Du Zuo-dong, Han Tong-zhen, Chen Jian-hua, Wang Ji-shun, Guan Jia-rui
    1991, 12(6):  836-839. 
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    Me2SiCl2 and Me(EtO)SiCl2 were cocondensated by Na/Kalloy in THFsolvent, and a series of cyclic polysilane containing ethoxy group were obtained. These compounds were purified and separated by preparative chromatography. Their structures were proved by using MS, IR, NMR, UV as the collateral evidences. The hydrolytic reactivities, thermal stabilities of these compounds were studied in detail.
    Studies on the Heparinization of Quaternaryly-Ammonized Poly-p-Chloromethyl Styrene
    Lin Si-cong, Wu Jin-di, Lu Yun, Zhu Yong
    1991, 12(6):  840-842. 
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    In this paper the heparinization of quaternaryly-ammonized poly-p-chloromethyl styrene (QAP-p-CMS) is studied and a method for calculating the average number of ionic bonds between QAP-p-CMS and heparin molecule is put forward. It is shown that both the amount of heparin and the quaternaryly-ammonization extent of P-p-CMS make a great impact on the constitutional and structural aspects of HP-p-CMS. The raise of the amount of heparin or the quaternaryly-ammonization extent of P-p-CMSa ll makes the heparin content of HP-p-CMS increase and the amount of ionic bonds between heparin molecule and QAP-p-CMS decrease gradually. Finally, an explanation for the results of heparinization is suggested.
    Synthesis and Characterization of Poly(Epichlorohydrin)
    Huang Jia-xian, Ding Lun-han, Zhu Duan-hui, Li Chun-rong, Liu Dong-zhou
    1991, 12(6):  843-846. 
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    In this paper it is testified that the complex of FeCl3 with propylene oxide, AI(Et)2Cl and Al-porphyrin would be just the better complex systemes for the synthesis of crystal and amorphous poly (epichlorohydrin) with molecular weights of a magnitude from 104 to 105. Mark-Houwink equation of amorphous poly(epichlorohydrin) was determined with fractional testing samples from the synthesized product.
    A Sensor of Glucose Oxidase Immobilized in Bombyx Mori Silk Fibroin Membrane
    Shao Zheng-zhong, Fang Yue, Yu Tong-yin, Deng Jia-qi
    1991, 12(6):  847-848. 
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    Glucose oxidase (GOD) can be immobilized in Bombyx mori silk fibroin membrane. This is due to the structural transition of the silk fibroin membrane from random coil to antiparalled β-sheet induced by methanol treatment. Glucose sensor was made of this GOD-immobilized fibroin membrane. The calibration curve, response time, recovery, thermal and storage stability were determined.
    Studies on the Graft Copolymerization of Acrylates onto Flax Fibres
    Wa Gong-sheng, Hu Yu-jie
    1991, 12(6):  849-851. 
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    The graft copolymerization of methyl acrylate(MA), ethyl acrylate (EA), and butyl acrylate (BA) onto flax fibres using KPS-TUas redox initiation system has been studied. The structure of the grafted fibres was characterized by means of IR, SEM, and X-ray diffraction. The highest grafting percentage was obtained when [KPS]=1.5×10-2mol/L, [TU]=2.0×10-3mol/L, [M]=3.0×10-1mol/L, [H+]=1.0×10-2mol/L, S:L=1:50 and at 60℃ in 2h. The grafting reactivity order of the monomers is BA>EA>MA.
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