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    24 November 1990, Volume 11 Issue 11
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    Articles
    Synthesis and Identification of GeFeAPO-5 Molecular Sieve
    Han Shuyun, Wang Liqun, Yu Guirong
    1990, 11(11):  1171-1174. 
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    GeFeAPO-5 molecular sieve was synthesized in the system of fluoride ions. After adsorption of pyridine the IRspectra showed the presence of both Brönsted and Lewis acid sites. GeFeAPO-5 molecular sieve was identified by means of X-ray diffraction analysis, determination of the unit cell parameters, electron probe, infrared spectra, Mössbauer spectroscopy, electron paramagnetic resonance spectrum, high resolution magic-angle-spinning solid state 31P and 27Al nuclear magnetic resonance. The results showed Fe and Ge entered into the GeFeAPO-5 framework.
    Syntheses and Characterization of Complexes of 2,5-Thiophcncdicarbaldchyde Schiff Bases with Copper (Ⅱ)
    Dai Huan, Zhong Weiqing, Yu Baoyuan
    1990, 11(11):  1175-1179. 
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    Four new copper( Ⅱ ) complexes of Schiff bases, derived from condensation of 2,5-thio-phenedicarbaldehyde with o-amino-p-R-phenol (R =-(CH3)3, -H, -Cl,-NO2),were prepered and characterized by means of elemental analyses, electrical conductances, magnetic susceptibility, differential thermal-thermogravimetric analyses and visible-UV, IRand ESRspectra. Complexes CuL1 and CuL2 show characteristic, of square-planar coordination by two nitrogen and two oxygen donor atoms of the ligand about the copper atom. Complexes CuL3·2H2O and CuL4· H2O which may possess hexa-coordination about the copper atom are arranged in a distorted octahedral geometry.
    Isomorphous Substitution of Zeolitic Framework (Ⅱ)—— Dealumination and Silicon Insertion for Zeolites in an Aqueous Solution of NH4BF4
    Liu Xinsheng, Xu Ruren, Ding Hong, Zhang Yanqiu, Liu Ziyang
    1990, 11(11):  1180-1185. 
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    Dealumination and silicon insertion of zeolites (Y, ZSM-5 and Beta) in an aqueous solution of NH4BF4 were investigated. The products were characterized by using various techniques such as XRD, IR, NMR, TPDand XRF. It is demonstrated that dealumination and silicon insertion occur definitely during this treatment. The Si/Al ratio is increased and the acidity is decreased with increasing the concentration of NH4BF4 used. In this process substitution of B for the framework elements does not occur and the process is proven to be a useful method for monitoring the Si and Al siting in the zeolites.
    ESR Studies on the Stability of Imidazolate and r,r'-Bipyridinate Bridged Heteropolynuclear Complexes
    Chen Dong, Tang Wenxia, Dai Anbang, Hang Shiying, Wang Huaqin
    1990, 11(11):  1186-1190. 
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    The determination of the pHdependent ESRspectra of some imidazolate and r,r'-bipyridi-nate bridged heteropolynuclear complexes:Co-Im-Cu, Co-Im-Cu-Im-Co and Co-(r,r'-bpy)-Cu have been carried out and show that the imidazolate bridged dinuclear and trinuclear cations exist as major species in .the solution only between pH: 7. 8-8. 5,but r,r'-bipyridinate bridged cation exists in solution in a wider pHrange (pH>6). At low pHthe imidazolate and r,r'-bipyridinate bridge are broken and eventually free Cu2+ion forms.
    Application of Oscillographic Indicating Technique on Methods of Kinetic Analysis——Determination of Mo(Ⅶ) and Cu(Ⅱ) with Alternating Current Oscillographic Bipotenial Catalytic Kinetic Method
    Xu Weijian, Huang Lan, Liu Yan, Gao Hong(H. Kao)
    1990, 11(11):  1191-1194. 
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    This paper reports a catalytic kinetic method of analysis in which the alternating current os-cillographic bipotentiometric indicating technique is used to observe the change of concentration of a reaction product which is produced by the catalytic kinetic reaction. The experimental result shows that this method is more sensitive, more convenient and economic.
    Studies on Adsorptive Stripping Voltammetry of Bismuth (Ⅲ) with 8-Hydroxy-5-QuinolinesuIfonic Acid
    Sun Yanjie, Lin Shuchang, Hu Naifei
    1990, 11(11):  1195-1198. 
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    In the supporting electrolyte containing KH2PO4 and K2HPO4 (pH = 7.0), 8-hydroxy-5- quinolinesulfonic acid (HQSA) can be adsorbed on the Hg electrode above -0.60 V (vs. Ag/AgCl electrode), thus the complex of Bi( Ⅲ ) with HQSA can also be adsorbed on the Hg electrode. The reduction peak of Bi( Ⅲ )-HQSAsystem Ep=-0.44 V) results from the reduction of Bi( Ⅲ ) into bismuth amalgam, belonging to a weakly adsorptive system of reactant. The electrochemical behaviour, especially the adsorptive properties of both HQSAand Bi( Ⅲ )-HQSA were studied by various methods. The reduction peak of Bi( Ⅲ )-HQSA can be used to determine trace amount of Bi( Ⅲ ) by linear sweep adsorptive stripping voltammetry. The peak hight is linearly proportional to the concentration of Bi( Ⅲ ) in the range of 5.0×10-9-1.0×10-6 mol/L. The detection limit of Bi( Ⅲ ) is 2.0× 10-9 mol/L.
    The Simultaneous Determination of Co(Ⅱ) and Mn(Ⅱ) by Chemilumincscencc in the System of Gallic Acid-Formaldehyde-Hydrogen Pcroxide
    Lin Soulin, Liu Yongqing
    1990, 11(11):  1199-1202. 
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    The chemiluminescent oxidation of gallic acid and formaldehyde in the presence of thiourea by alkaline H2O2 is found to be applied to the simultaneous determination of cobalt and manganese ions. The proposed method is highly selective to those ions. Detection limits are found to be 1. 5× 10-5 ppm for CO( Ⅱ ) and 0. 02 ppm for Mn( Ⅱ ). Relative standard deviations are 1% for 1× 10-3 ppm Co( Ⅱ ) and 1. 8% for 0. 4 ppm Mn( Ⅱ ) respectively.
    Studies on Organosilicon Compounds with Biological Activity (Ⅺ)——Study of 2-(Trimethylsilyl)Ethylthio(N-Substituted)Acetamide
    Xie Qinglan, Wang Mingde, Shan Zhixing
    1990, 11(11):  1203-1207. 
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    Seventeen 2-(trimethylsilyl)ethylthio(N-substituted)acetarnides were synthesized with two different methods. The structures of the products were studied by NMR(1H, 13C), IRand MS. The relationship between spectra and structure of the products was discussed. Results from the preliminary biological tests show that these compounds have weak fungicidal activities.
    Studies on Self-Oxidation Reaction of Benzyl Alcohol Catalyzed by UV Illumination-Activated Pt/TiO2
    Cai Bingxin, Chen Deshan
    1990, 11(11):  1208-1211. 
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    In the present paper, we explore mainly the photochemical self-oxidate reaction of the benzyl alcohol (C6H5CH2OH) used as the reactant in the presence of the UV-illumination activated n-semi conductor catalysts TiO2Pt/TiO2) blended with and put forward the reaction mechanisms of ultraviolet ray illumination in term of the surface feature of Pt/TiO2 and "one-photon action model".
    Chemistry and Application of Phosphonium or Arsonium Ylides (XIV)——Reaction of Phosphonium or Arsonium Ylides with Methyl Propynoate and Hydrolysis of Some Adducts
    Ding Weiyu, Cao Weiguo, Xu Zhenrong
    1990, 11(11):  1212-1217. 
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    Reaction of nine Ylides, carbomethoxymethylenetriphenylarsine (1b), benzoylmethy-lenetriphenylphosphine, arsine, acetylmethylenetriphenylphosphine, arsine, cyanomethylen-etriphenylphosphine, arsine, p-nitrophenylmethylenetriphenylphosphine (li) and 1-methyl-2-car-boethoxymethylenetriphenylphosphorane with methyl propynate(2) was studied. The hydrolysis of the adducts l,3-dicarbomethoxy-2-propenylenetriphenyl arsorane(3b) and.1-carbomethoxy-3-p-ni-trophenyl-2-propenylenetriphenylphosphorane(3i) which are the reaction products of 1b and li with 2 respectively was also studied in aqueous methanol.
    Studies on Macrocyclic Diterpenoids (Ⅰ)——A New Approach to the Key Intermediate of Sarcophytol-B
    Li Ying, Li Yulin
    1990, 11(11):  1218-1221. 
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    Ethyl (Z,E,E)-2-isopropyl-5,9,13-trimethyl-tetradeca-2, 4,8,12-tetraenoate(2), the key intermediate of Sarcophytol-B, has been synthesized by using geraniol as the starting material. The key step in the synthesis is Wittig coupling of farnesyltriphenylphosphonium bromide (8) with ethyl 2-oxo-3-methyl butyrate (3). (3) was prepared by Grignard reaction of ethyl oxalate with iso-propylmagnesium bromide.
    Studies on the Chemical Constituents of Rabdosia RugoSa
    Li Yuanzong, Hua Shuming, Xie Duenyuan, Chen Yaozu
    1990, 11(11):  1222-1226. 
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    Three pairs of B-seco-ent-kaurene type diterpenoids were isolated from Rabdosia rugosa (Wall. )Hara collected from Tibet, and the structures of them were elucidated. They are diterpenoids rugosanin(Ⅰ ) and dihydrorugosanin (Ⅱ ), isodocarpin( Ⅲ ) and dihydroisodocarpin (Ⅳ ), carpala-sionin(Ⅴ) and dihydrocarpalasionin (Ⅵ). ( Ⅰ ), (Ⅲ) and (Ⅴ) were isolated, respectively, in the. form of mixtures with their corresponding dihydrocompounds ( Ⅱ ), (Ⅳ ) and ( Ⅵ ). The structure identification was based on the mixtures of each pair. Diterpenoid (Ⅱ ) is a new compound; ( Ⅰ ), (Ⅳ ) and ( Ⅵ) are for the first time found in nature, ( Ⅲ ) and ( Ⅴ ) are known compounds.
    A Investigation on the Surface State of La1-xMx CoO3(M-Ca,Sr) Perovskite Oxides by XPS
    Wei Quan, Cui Wei, Long Xiang, Xu Yue
    1990, 11(11):  1227-1231. 
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    Aseries of La1-xMxCoO3 (M = Ca,Sr) perovskite oxides have been synthesized and the change of surface states after the substitution of La3+ ion in LaCoO3 with Ca2+ or Sr2+ ion have been investigated by XPS technique. It is shown that the percentage of adsorbed oxygen obtained in the peak fitting of O1s spectra is regularly varied with the substitution content x. The peak fitting of Ca2p, and Sr3d spectra has been performed and Ca(2) and Sr(2) may be assigned to the situation that there exist vacancies of oxygen surrounding them. The relationship between the percentage of Ca(2) or Sr (2) and the percentage of absorbed oxygen can be adoptd to explain the surface state change after substitution. Therefore, we reasonably assume that the substitution of Sr2+ causes an increase in vacancy of oxygen, however, the substitution of Ca2+ causes an opposite result.
    A Study of the Characteristic of Metastable Zone of the Aqueous K2SO4 Solution (Ⅱ)——The Effect of Impurities on the Crystallization Process of K2SO4 Solution
    Wang Zichen,Zhao Qiugang, Zhang Lihua, Tai Xiuyu, Yang Yonghua, Zhao Muyu
    1990, 11(11):  1232-1235. 
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    The effects of 10 different ions on the metastable zone width and the nucleation characteristic parameters of aqueous K2SO4 solution are investigated. It is observed that the metastable zone widths are increased in the presence of Li+,Cr3+,Al3+,Fe3+ and decreased in the presence of Cu2+, Zn2+,Mn2+, Mg2+ and do not greatly change in the presence of Na+ and NH4+. The influence of impurities on the metastable zone width may be the result of their effects on the specific surface energy σ12, the nucleation energy △G(r*) and the rate of crystal growth.
    A Study on Separation of Acetic Acid,Water and Formic Acid System——Refinement of Acetic Acid by Esterification-Azeotropic Distillation
    Xu Qintang, Lu Fangping, Li Xi, Luo Ruyi, Jiang Fuming
    1990, 11(11):  1236-1239. 
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    Separation for the acetic acid-water-formic acid system in a continuous distillation column was studied. The suitable esterification reagents for the dehydration of acetic acid and for removing formic acid from the system are saturated aliphatic alcohols containing 3～6 carbon atoms. The experimental results obtained indicate that the acetic acid with a higher purity (>98.5%) can be obtained by esterification-azeotropic distillation for the given system.
    A Study of Solid Surface Acid by Surface Photovoltage Spectrometry
    Wang Dejun, Feng Shouhua, Liu Wang, Xiao Liangzhi, Li Tiejin
    1990, 11(11):  1240-1244. 
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    The information of solid surface states can be obtained sensitively by measuring the surface photovoltage relating to the sub-bandgap transition. And a solid surface acid is related to the acceptor type surface states. In this paper, the surface photovoltage spectra of some zeolites and heteropolyacids were measured by sub-bandgap light. Is is found that there are acceptor type surface states at 900～1500 nm. The peak position corresponds to the energy level position of the surface states representing their acid strength; the peak strength corresponds to the surface state density indicating their acid amount. Finally, the experiment results are discussed theoretically.
    Influence of the Heteropoly Acid Structure on the Oxidative Dehydrogenation of Ethylbenzene
    Wu Tonghao, Li Xia, Yang Hongmao, Wang Guojia, Jiang Yuzi
    1990, 11(11):  1245-1248. 
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    We have first studied the catalytic behaviour of H6P2W18O62 and compared with H2PW12O40 in the oxidative dehydrogenation of ethylbenzene to styrene. The interesting results were obtained. The shorter increasing time of activity can be related to the more unpair electrons of carbonaceous material on the surface.
    Effects of Center Atom (P,As) in Heteropolymolybdate on Catalytic Oxidation
    Wang Guojla, Hu Ji, Yang Hongmao, Wu Tonghao, Jiang Yuzi, Zhen Kaiji
    1990, 11(11):  1249-1253. 
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    The heteropolymolybdates of Keggin structural anion with different center atoms, M3(XMo12O40) in which M=K+, NH4+; X=P, As, were synthesized. Their redox and acidic proper-ties were examined by means of FTIR, ESR, TPD, and cyclic voltammetry techniques. Based on a comparison of heteropolymolybdate of both kinds of center atom(P, As), we found that the one con-tainning As atom is easier reducible and possesses lower acid strength. As a result, the catalyst con-tainning As anion is less active for the oxidative dehydrogenation of isobutylaldehyde, however, is more selective for the formation of methacrylic acid. These effects of center atom in heteropolyacid salt on the oxidative dehydrogenation activity and the oxidation selectivity may be related to the increasing of oxidation-redaction potential and facility of donating bridged oxygen of the As anion.
    The Characteristics of Charge Transfer of 1,4-Benzodiazepin-2-ones
    Ying Baining, Ouyang Jiexiang, Xu Xiangong
    1990, 11(11):  1254-1258. 
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    The interaction of 1,4-benzodiazepin-2-ones, the sedatives and muscle relaxants in medicine, with tetracyanoethylene or potassium p-methylphenoxide can form charge transfer complexes respectively. Using spectrophotometric method, the electron affinity(EA) and the ionizaton potential (Ip) of the title compounds are calculated with the energy of electron transfer hvCT. The thermodynam-ic constants(K, △H, △S) of the complexes are determined as well. The results show that 1,4-benzo-diazepin-2-ones can not only act as the charge acceptors but also as the charge donors. The hvCT or △Hvs Hammett substituent constant σ at position 7 of the molecule gives a linear relationship.
    The Kinetic Study on the Synthesis of β-Hydroxyethyl Acrylate Using Cation Ion Exchange Resin as Catalyst
    Yuan Yuncheng, Gao Dabin
    1990, 11(11):  1259-1262. 
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    The Kinetic study is made on the synthesis of β-hydroxyethyl acrylate by using 732# strong acidic cation ion exchange resin as the catalyst. The order, the rate constant and the activation energy of the reaction are measured or calculated. The mechanism of the reaction is given.
    Studies on Chemical Equilibrium of the Complex Reaction with the Method of Dimensionless Parameter
    Zeng Xiancheng, Zhang Yuanqin, Deng Yu
    1990, 11(11):  1263-1267. 
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    The method of dimensionless parameter of thermostatics for (2-1) type reversible reaction suggested in literatures was used to study the complex reaction of dibenzo-.18-crown-6 with sodium ion in DMSO-H2O mixed solvents (800/200(V/V)) at 25. 0 and 30. 0℃ respectively.The enthalpy change and equilibrium constant of the reaction were directly measured. The applicable range of the method is discussed. The basic requirement for evaluating equilibrium constant Ka with extrapolation is also proposed in this paper.
    A Study on LB Flim of Methylacrylic Acid/Phosphatidyl Ethanol Methylacrylamidc Copolymcr
    Zhang Xi, Cha Xiao, Zhou Hui, Shen Jiacong
    1990, 11(11):  1268-1272. 
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    Methylacrylic acid/phosphatidyl ethanol methylacrylamide copolymer with different mole ratios was prepared. The curves between the surface pressure and molecular area, and the curves of capacitance-voltage of the LBfilm on a metal-oxide-semiconductor (MOS) made with this copolymer were studied. The phase transition temperature of the LBfilm was also studied by FTIRmethod.
    A Study on Structure and Properties of HDPE/NBR Blends
    Fu Qiang, Wang Guiheng, Xu Xi
    1990, 11(11):  1273-1277. 
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    The relationship between structure and properties of high density polyethylene (HDPE)/ acrylonitrile-butadiene rubber (NBR) blends was studied. The results show that a small amount of NBRcan greatly improve the environmental stress crack resistance(ESCR) and the impact strength of HDPE. WAXDreveals that NBR in the blends can give itself an orientation to a certain extent on the phase interface when NBRcontent is small. The particles of NBR with a side of 0.2 μm (average size) can disperse in HDPEphase when NBR content is less than 20%, and can't be extracted out with benzene, indicating that smaller NBRwould favour entanglement with HDPE. The interaction between HDPE and NBR was identified by DMA. The scheme for the interaction between HDPE and NBR was proposed.
    The Synthesis of Poly(p-Phenylcne Sulfide)Resins with High Molecular Weight
    Luo Jixing, Xiong Yuanxiu, Li Hao, Yang Yunsong
    1990, 11(11):  1278-1280. 
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    Using H2S, NaOH and p-C6H4Cl2 as raw materials and proper Na3PO4 as an assistant in hex-amethylphosphoryltriamide(HPT), the crystal linear poly (p-phenylene sulfide) resins with high molecular weight (HMWPPS) was synthesized during 4～5 h under normal pressure.The properties of the polymer were determined, m. p. >290 ℃; decomposition temperature by heat>500 ℃; low shear viscosity at melting state: 3.0-68.0×103 Pa (determined at 303 ℃). The product was used to do the melt spun test directly and the fiber of the HMWPPS was obtained. This method has following obvious advantages as the equipment is simple, operation is easy, reaction system has a higher activity, solvent is stable, product recovery ratio is high, cost is low and it is easy to put into large-scale production.
    Construction of Acidum Nicotinicum-FET and Its Application
    Yu Baoming, Li Yourong
    1990, 11(11):  1281-1282. 
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    Acidum nicotinicum-FET was constructed by using acidum nicotinicum-S336 as a electro-active material. The sensor gives Nernstian response to acidum nicotinicum in the concentration range from 6. 3×10-1 to 1. 2×10-4 mql/L, and the potential is almost independent of pHover the range from 6. 5～9. 4, and was applied to the determination of tabellae acidi micotinici, the results correspond with the pharmacopoeia.
    Some Problems in the Determination of Trace Rare Earth Impurities in Complicated Rare Earth Matrix by Using a ICP Spectrometer
    Jiang Zucheng, Chen Hao, Zhang Shuxiu
    1990, 11(11):  1283-1285. 
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    Amethod for the determination of 14 rare earth impurities in Tb4O7 with a purity of 99. 9% by using a JY38 sequential ICPspectrometer is described. The spectral interferences of the matrix were investigated in detail. Asimple experimental method is proposed to estimate the optimum concentration of matrix in solution. In the presence of 1 mg/mLof matrix (Tb), the detection limit for the anatytes is between 3.0×10-2 and 3. 1×10-4 μg/mL (in solution) and 30 and 0. 31 μg/g(in solid), respectively. The relative standard deviations are in the range form 0. 7% to 4.3% with the exception of Ce.
    Optimizing Design for Investigation of Catalytic-Kinetic Analysis by Multi-Object Simplex Method
    Jiang Hailiang, Li Changfeng, Yuan Dawen
    1990, 11(11):  1286-1288. 
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    An multi-object simplex method has been developed which shows promise as a method for accurate and rapid search of optimum conditions for catalytic kinetic analysis. This method is applied to two catalysed reaction systems in this paper. Compared with the single factor optimization, the number of experiments is reduced and the apparent molar absorptivity is increased by 30%～36%.
    Determination of TTP-Co Configuration,Synthesis of meso-Tetrakis-(3,4-methylenedioxyphenyl)porphyrin and Spcctrophotometric Study of Its Color Reaction with Cadmium
    Huang Zexing, Pan Minqi, Zhong Weili, Zhou Zhengying, Ren Linying, He Shuqiong, Hu Shengzhi, Shi Dashuang
    1990, 11(11):  1289-1291. 
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    In this paper, configuration of TTP-Co was determinated. Awater insoluble porphyrin (TMDOPP) was synthesized and its color reaction with cadmium was studied. Ahighly sensitive method for determining cadmium at ppm× 10-3 level was established. The simple and rapid method has been succefully applied to the direct determination of trace amount of cadmium in water sample with a satisfactory result.
    The Synthesis of Crown Ethers (XV)——Synthesis of Hydroxy Crown Ethers and Separation of Their Cis-trans Isomers
    Wang Yuting, Zhou Jianjun, Wan Huijie, Xie Zhishui, Huang Zaifu
    1990, 11(11):  1292-1294. 
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    Eight symmetrical and asymmetrical dibenzo hydroxy crown ethers were synthesized via the reaction of 1, 1'-(o-phenyl enedioxy)bis(2, 3-epoxyprop) ether with catechol and alkyl substituted catechol (for example, 3,5-ditert-butyl catechol and saturated urushiol) in good yields, and their cis-trans isomers were easily separated by column chromatography and crystallization. The structure of the new compounds were determined by IR, 1H NMR, MS, elementary analysis.
    Synthesis of N-(Trichlorpgermyl) Substituted Propionyl Hydrothiazol-2-Thiones Compounds and Their Hydrolysis Products
    Huang Huamin, Li Yezhi, Hao Sue, Wang Yuping
    1990, 11(11):  1295-1297. 
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    In this paper trichlorogermyl propionyl chlorides Ⅱa-c were prepared by the reaction of trichlorogermyl propionic acid Ⅰa-c with sulfenyl dichloride in 86%～9.1% yields.The compounds Ⅱa-c reacted with thiazolidine-2-thione or 2-mercaptobcnzothiazolc to form the N-(trichlorogermyl) substituted propionyl-thiazolidine-2-thione Ⅲu-c and N-(trichlorogermyl) substituted propionyl benzothiazoline-2-thione IVa-c in 62.9%～97.7% yields.The β-substituted propionyl thiazolidine-2-thionyl germanium sesquioxide Va-cand β-substituted propionyl benzothiazoline-2-thionyl germanium sesquioxide VIa-c were obtained by hydrolysis of compounds Ⅲa-c and Ⅲa-c in 44.0%～83.8% yields.The compounds Ⅱb-c, Ⅲa-c, Ⅳa-c, Ⅴa-c and VIa-c are new compounds.
    Catalytic Oxidation of Alcohol on SnO2 Ultrafine Particle Thin Film
    Jiang Yueshun, Wang Yajing, Dai Guorui, Dong Xijuan, Tang Daxin, Zhu Zhenjia, Li Tiejin
    1990, 11(11):  1298-1300. 
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    In this article, the porous columned SnO2 ultrafine particle thin films are prepared on silicon by PCVDtechnique. The variations of XPS, IRand film electrical resistance are researched during the gas adsorption, desorption and oxidation process on the film surface. After the analysis of alcohol the oxidation mechanism induced by the adsorbed O- and O2- on the film surface is proposed. The results of gas-sensitive properties of SnO2 ultrafine particle film are explained satisfactorily.
    An Investigation in Properties of Active Sites for PtY/Al2O3
    Zhu Guangzhong, Shi Qiujie, Li Fengyi
    1990, 11(11):  1301-1303. 
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    The catalytic reforming and active site properties for Pt/Al2O3 and PtY/Al2O3 were studied by using pulse microcatalytic reactor, TEM and poisoning technnique. The kinetic data of dehydro-genation of cyclohexane for the two catalysts were calculated. The determination of the total numbers of active sites (TNAS) for the catalysts shows that Ymakes TNAS increase. The correlation of the catalytic behavior with the particle size and the properties of active sites for the two catalysts has also been discussed here.
    Studies on Hydrogen Transfer Polymerization
    Liu Tongbao, Ge Yuping, Hu Xianli
    1990, 11(11):  1304-1306. 
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    This paper reports sodium-catalyzed hydrogen transfer polymerization of hydroxyethyl aery-late to form a copolymer of β-propiolactone and ethylene oxide. The structure and molecular weight of the copolymer were determined by element analysis, IR, NMR, VPO. The mechanism of this reaction is also discussed.
    Surface Treatment of Polytctrafluoroethenc by Air Plasma
    Ma Yuguang, Yang Meilin, Lin Dehou, Shen Jiacong, Liu Xiaoxun
    1990, 11(11):  1307-1309. 
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    The surface of polytetrafluoroethene (PTFE) was treated by air plasma in the equipment designed by ourselves, as a result, the surface wettability increases. The methods of contact angle measurement, XPS, and ESRwere used to diagnose the surface which was exposed to the plasma at different time and different power input. The contact angle of water on the treated PTFEdrops down to about 60° comparing with 108° of the untreated PTFE. The treating effect at 180 Wor 50 Wis more efficient than at 100 W. The improvement of wettability is found to be related with the peroxide radicals formed on-the surface of PTFE.
    The Determination of Dy,Eu,Sm and Tb by Laser Induced Derivative Fluorimctry
    Li Jianjun, Chen Guanquan, Zeng Yun'e
    1990, 11(11):  1310-1311. 
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    This paper describes a new procedure for the determination of Dy,Eu,Sm and Tb by using laser induced derivative fluorimetry. The analytical method is based on the use of TFA(Trifluoroacety-lacetone) and TOPO(Trioctylphosphine oxide) as ligands. The first derivative technique was used for the correction of background and reduction of interference among spectra. The effects of foreign ions were investigated. The mentioned method was used to simultaneously determine the amount of Dy,Eu, Sm and Tb in yttrium oxide without pre-separation. It is concluded'that this procedure is satisfactory for the simultaneous detection of these four rare earth ions.
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