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    24 February 1984, Volume 5 Issue 1
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    Articles
    STUDY ON THE INTERACTION OF TRANS-[Pt(NH3)2Cl2] WITH NUCLEOSIDES BY 13C NMR
    Tang Wenxia, Zhang Shiyong, Yuan Chuanrong, Tai An-pang
    1984, 5(1):  1-6. 
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    Interaction of trans-[Pt(NH3)3Cl213C NMR. The formation of a series of complexes and the site of complexation of nucleosides (or nucleotide) to trans-[Pt(NH3)2Cl2] in the reaction systems were ascertained. On the basis of the results obtained, a possible reasoning of different behaviours of cis-, trans-[Pt(NH3)2 Cl2] in antitumour action was discussed.
    Preface
    STUDIES ON THE EXTRACTION OF MANGANESE (Ⅱ) FROM SULFATE SOLUTION WITH Di-(2-ETHYLHEXYL) PHOSPHORIC ACID IN KEROSENE
    Shen Jinglan, Jiang Dehua, Sun Sixiu
    1984, 5(1):  7-14. 
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    The partition equilibria for the following systemsMn2+/(Na2·H2)SO4(0.1M)/HDEHP-Kerosenc and Mn2+/(Na2·H2)SO4(0.1M)/(HDEHP-TOPO)-Kerosene have been studied at 25℃. The extraction reactions were found to be   respectively.The effects of temperature and additives, TBP, P350, TOPOon the extraction of Mn(Ⅱ) from 0.1M (Na2,H2)SO4 with the solution of HDEHPin kerosene have also been investigated. The synergism of the additives has been found to decrease in the order TOPO>P350>TBP. By using the temperature coefficient method, ΔH° of ( i ) was calculated to be-2.90 Kcal/mol in the range of 20-60℃. Thus the extraction of Mn(Ⅱ) from aqueous solution with HDEHPis an exothermic reaction. The increase of distribution ratio Dwith temperature, may be partly due to the increase in pHof the sulfate medium.
    Articles
    A STUDY ON THE DISSOCIATION CONSTANTS OF N-α-NAPHTHYLGLYCINE AND N-β-NA- PHTHYLGLYCINE AND THE STABILITY OF THEIR COMPLEX COMPOUNDS FORMED WITH COPPER (Ⅱ) AND NICKEL (Ⅱ) IN MIXED SOLVENTS
    Chen Rongti(Y. T. Chen), Liu Hengqian
    1984, 5(1):  15-20. 
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    The apparent acid dissociation constants of N-α-naphthylglycine and N-β-naphthylglycine and the stability constants of their complex compounds formed with copper(Ⅱ) and nickel(Ⅱ) have been determined by pHmethod at 25.0℃ in 20%(V/V), 50%(V/V) and 75%(V/V) dioxane-water mixed solvents in presence of 0.10 Msodium perchlorate. The data obtained in 20%(V/V) dioxane-water were compared with those in 30%(V /V) ethanol solution and the solvent effect upon the stability of these complex compounds was discussed. It was found that, under the same conditions, even though N-α-naphthylglycine showed higher basic and lower acidic strength than its isomer N-β-naphthylglycine, it showed, however, lower stability. This fact infers considerable steric effect existing in the molecule of the former complex compound and a modification of configuration is implied.
    ESTIMATION OF EXTRACTION CONSTANTS
    Chen Yude
    1984, 5(1):  21-28. 
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    Seven methods are proposed for estimation of extraction constants as follows.1. The relation:- (pH1/2 )1.0= AZ2/r + BX±+ C-λ(n-1)+(lgK0dm+a)/n+lgKaKd-1 Linear relations between- (pH1/2 )1.0 for two similar cations being extracted with a series of extractants;3. Linear relations between- (pH1/2)1.0 for two similar extractants extract a series of cations;4. Linear relations between- (pH1/2)1.0 for two diluents;5. Linear relations of-(pH1/2)1.0 vs. Z2/r for cations with similar electronegativity value;6. Normal variation of extraction for a series of cations in accordance with Z2/r and electronegativity values;7. Extractants of large ∑pKa match closely with cations of large Z2/r, and extractants of small electrouegativity match closely with cations of large electronegativity.
    COMPLEXES OF CROWN ETHER WITH THE RARE EARTH NITRATES(Ⅴ)
    Jiang Haiing, Ren Dehou, Xue hongfu, Dai Cangding, Wang Li
    1984, 5(1):  29-33. 
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    The solubilities of the ternary system, Y(NO3)3 ·3H2O-18C6-CH3COCH3, at 18℃ have been determined by the semimicro method to study of phase equilibrium. The results indicated that there is only one solubility curve for this ternary system, it correspounds with the solid phase of the complex CY(NO3)3 ·18C6·3 H2O]. We have not found any other complex species having different ratios, Y(Ⅲ) crown.The behavior of water for this system in equilibrium has been examined. The results are. the mole ratio [H3O/Y(NO3)3], no matter whether it is in liquid phase or solid phase, is always 3:1.The relative stable complex, Y (NO3)3 ·18C6·3H2O, at first has been obtained by us. The composition of this complex has been examined by chemical analysis and infrared spectra.
    THE SPECTROPHOTOMETRIC COMPUTING ANALYSIS OF THREE COMPONENTS SYSTEMS——THE APPLICATION OF THE ROTATING COORDINATE METHOD
    Ying Longbiao, Liu Yiying
    1984, 5(1):  34-38. 
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    In this paper, a new spectrophotometric method using programmable calculator has been developed for determination of three components systems. An improved algorithm for computing-analysis is proposed and programmed with the rotating coordinate method. Apreliminary theoretical exploration on this method is presented.By this method, the analytical results are obtained by application of TI-59 programmable calculator to analysize the spectrophotometric data measured, and the separation each other of constitutents needs to be not down.The method is a rapid and accurate one and convenient to spread. Not only provides it an adequate quality-controll procedure for pharmaceutical production, but also is significant for development of the analysis on polymixture components systems.
    SPECTROPHOTOMETRIC DETERMINATIOIN OF MOLYBDENUM AT NANOGRAM LEVEL WITH OXIDIZED HEMATOXYLIN AND ASCORBIC ACID
    Zhang Zaizheng, Qiu Jianren, Lin Guihuai
    1984, 5(1):  39-44. 
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    Ahighly sensitive spectrophotometric method has been developed for the determination of Mo(Ⅵ) by means of heating oxidized hemaloxyin and ascorbic acid in a boiling water bath. The conditions of the colour development in the system of molybdenum (Ⅵ)-oxidized hematoxylin-ascorbic acid were studied. The results obtained indicate that the highest sensitivity attained is associated with the commercial reagent labeled "hematoxylin" and with the preparation of oxidized hematoxylin solution. The coloured product showing maximum absorption at 450-460 nm obeys Beer's law in the range from 1 to 30 ng of Mo (Ⅵ) in 10 ml solution. The apparent molar absorptivity has been found out to be 2.14×107. The effect of various cations and anions on the system was investigated and it was observed that oxidized hemetoxylin-ascorbic acid is a selective reagent for Mo (Ⅵ) in the presence of NH4 Fat proper concentration. However, more than 100 ng Mo (Ⅵ) in the 10 ml solution interferes with the determination. The method is simple and convenient and has been used for the direct determination of Mo(Ⅵ) in surface water and in urine with satisfactory results.
    STUDIES ON A NEW CONSTRUCTION OF THE AUROCYANIDE ION-SELECTIVE ELECTRODE
    Gong Hongzhong, Xiao Dan, Wang Caili
    1984, 5(1):  45-50. 
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    A new construction of the aurocyanide ion-selective electrode has been made. A PVCsensing membrane has been consisted of the aurocyanide salt of the trioctylhexade-cylammonium as the ion-exchanger. The platinum electrode immersed in a 0.01M KAu(CN)2-0.01M K3Fe(CN)6-0.01M K4Fe(CN)6 solution has been tested as the internal reference electrode system. The basic characteristics of the electode are studied. At 25℃, the electrode shows Nernstian response for aurocyanide ion over the concentration range from 1× 10-1M to 3.2×10-7 Maurocyanide ion with a slope of 59mV. The detection limit is down to 8×10-8M. The potential selectivity coefficients for more than ten anions have been measured, and the regularity of the potential selectivity coefficients has been discussed. The results show that the electrode exhibits a good selectivity for the aurocyanide ion. In a preliminary application gold in aurocyanide plating solution has been determined by using the proposed electrode.
    THE USES OF MASKING AGENTS IN CHELOMETRY(Ⅹ)——MALONIC ACID AS A SPECIFIC MASKING AGENT FOR ALUMINIUM
    Chen Yongzhao, Chen Huanguang
    1984, 5(1):  51-56. 
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    The masking properties of malonic acid in chelometric titration have been investigated. Theoretically when EDTAis used as titrant, it can mask Fe(Ⅲ), Ti(Ⅳ) and Al, but if DCTAis used instead, it can mask Al only at pH 5-6.It was found experimentally that when DCTAis used as the titrant, malonic acid can mask Al up to 80mg or 60mg at pH 5.3 or 5.7. In order to indirect titration of Al, we had used malonic acid to displace the DCTAfrom the Al-DCTAcomplex at pH 5.5, but the displacement reaction was not complete even when the solution was heated or put aside for a long time. So we used the following procedure; Take two equal aliquots of Al solution Aand B. Only in solution A, add 1 to 2 g. of malonic acid to mask the Al. Then equal volumes of 0.02 M DCTA (over 2 ml in excess) are added to both solutions. After adjusting to pH 5.5 and using xylenol orange as indicator, titrate the remaining DCTAwith 0.02M Zn solution. The difference between the volumes of Zn solution in titrating the Aand Bsolutions multiplying the molarity will give the content of Al. In this way we found that: (1) in the determination of 5,8 or 10 mg Al, 1,1.5, or 2 g malonic acid should be used with accurate results; (2) in determining 5 mg of Al, 1 to 2 folds of the following metals do not interfere: Zr, Th, Sn, Bi, Fe, Ti, Ga, Ce, La, Y, Gd, Cr, Hg, Cu, Ni,Co, Pb, Zn, Cd, Mn, V, Sb, W, Mo, Ca, Mg, Ba, Sr, Ag. The selectivity of the titration is very high. It can be said that when DCTAis used as the titrant, malonic acid is a specific masking agent for Al.
    THE CATALYTIC EFFECT OF BIS-(ACETONYLACE-TONATO) COBALT(Ⅱ) IN ORGANIC REACTIONS(Ⅱ)——THE C-ALKYLATION OF ACETYLACETONE
    Chen Weixing, Wang Yijun, Hu Hongwen
    1984, 5(1):  57-61. 
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    The catalytic effect of bis-(acetonylacetonato) cobalt(Ⅱ) in the C-alkylation of acetylacetone was investigated. Acetylacetone and benzyl or substituted benzyl chloride were heated in o-dichlorobenzene solution in the presence of catalytic amounts of bis-(acetonylacetonato) cobalt(Ⅱ), giving mainly C-alkylation products. Seven new compounds were pre pared by this method. Electron donating groups in the para position of substituted benzyl chlorides accelerated the alkylation reaction and gave higher yields.
    DETERMINATION OF EQUILIBRIUM CONSTANTS OF MOLECULAR COMPLEXES BETWEEN N-METHYLPYRROLIDONE AND SOME C8 AROMATIC HYDROCARBONS BY SPECTROPHOTOMETRIC METHOD
    Shen Weiguo, Ni Feng, Chen Mingzhi, Chen Wufeng, Zheng Guokang
    1984, 5(1):  62-66. 
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    Taking hexane and cyclohexane as inert diluent, 1:1 complex equilibrium constants for the N-methylpyrrolidone complexes with styrene, o-xylene, m-xylene and p-xylene have been determined in ultraviolet range by Spectrophotometric method. These equilibrium constants can be used to make qualitative indication of strength of weak chemical interaction.
    THE STRUCTURAL EFFECT IN FORKED CONJUGATIVE SYSTEMS (Ⅵ)——THE RULE OF HOMOLOGOUS LINEARITY FOR I. R. SPECTRA OF AZACHALCONE COMPOUNDS
    Chen Zhendong, Wu Yangjie, Yin Mengben, Jiang Mingqian (Ming-chien Chaing)
    1984, 5(1):  67-72. 
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    For a study on the forked conjugative system and its relation with the corresponding linear conjugative series,in this paper three type with 11 compounds of forked conjugative azachalcone homlogs. (2P0nB,4P0nB,2QonB) have been synthesized, of which the starred ones are new compounds.
    13C NMR RESEARCHES OF SEVERAL CARBAZOLE DERIVATIVES (ORGANIC PHOTOCONDUCTOR MATERIAL)
    Chen Liang, Hu Yuxian
    1984, 5(1):  73-76. 
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    In this paper the 13C NMRresearch of 3-bromo-carbazole, 3,6-dibro-mo-carbazole, 9-(2',3'-epoxypropyl) carbazole, 9-(2',3'-epoxypropyl)-3-bromo-carbazole and 9-(2',3'-epoxypropyl)-3, 6-dibromo-carbazole has been made.The proton noise decoupled, proton off-resonance decoupled and 13C-1Hcoupled NMRspectra for five carbazole derivatives are measured. The 13C NMRspectra data of them are analysed and compared. The following, points are summarized: (1) assignment methods of the resonance signals in13C NMR; (2) chemical shift range of epoxypropyl; (3) the range of coupling constants. The points described may be useful for determining valence bond characteristic and structure of these compounds.The experimental results show that carbon-13 chemical shifts, one-bond coupling and two-bond coupling constants of carbazole derivatives have fixed regularity. Therefore, they not only provide a powerful basis for determining structure but also bear some significance for study of 13C NMRof carbazole derivatives and complexes.
    A STUDY OF HYDROGEN ISOTOPE EXCHANGE BETWEEN HYDROGEN AND LIQUID WATER IN THE CONCURRENT-EXCHANGE REACTOR
    Qi Shilun, Chi Dongxian, Li Yongshun, Qian Zai hu
    1984, 5(1):  77-82. 
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    In this paper hydrogen exchange reaction between hydrogen and liquid water was performed successfully using hydrophobic resin of Dtype as support and Pt as active component.The kinetic equation in a concurrent flow reactor was discussed.At apparent velocity of hydrogen from 0.04m/sec to O.im/sec and 17.5℃ and under 1 atm the determined rate constant of the catalytic exchange reaction K is >30×103 mol/m3·hr.
    THE MECHANISM OF FORMATION AND CRYSTAL GROWTH OF MOLECULAR SIEVE ZEOLITE(Ⅺ)——CRYSTAL GROWTH OF T-TYPE ZEOLITE
    Wang Xingqiao, Chen Zhongcai, He Shuhua, Mao Yougang, Li Shu, Song Tianyou, Xu Ruren
    1984, 5(1):  83-88. 
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    Isothermal phase transformation digram was developed for the K2O-Na2O-Al2O3-SiO2-H2Osystem at 100℃. T-type zeolite was obtained as a pure phase from the reaction mixture with the mole ratio as. 32>SiO2/Al2O3>24 0.34>M2O/SiO2>0.30 0.30>K2O/M2O>0.23 H2O/SiO2 = 16 In the induction period of T-type zeolite or amorphous phase region there were no spontaneous nucleation. Akinetic model on the crystal growth of rod-like T-type zeolite was suggested as dx/dt= kx2/3 , where k is related to the composition of original gel, especially to the temperature. Ec of T-type zeolite was measured as 16.7Kcal/mol for the system of 1.95K2O·5.85Na2O·Al2O3·26SiO2·416H2O.
    Preface
    ENRICHMENT OF LITHIUM ISOTOPES BY HIGH PRESSURE ION EXCHANGE DISPLACEMENT CHROMATOGRAPHY (Ⅲ)--SEMICONTINUOUS ENRICHMENT
    Ling Daren, Zheng Zuying, Yue Tingsheng Xu Huiqun, Yang Kunshan, Wang Yani
    1984, 5(1):  89-93. 
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    The semicontinuous enrichment of isotopes and the variation of the total enrichment of the isotope species to be enriched while approaching the steady state of the band are studied. The experiments show the variation of the total enrichment vs displacement follows the expression derived by one of the authors:  In the enriching process, for a band of a given length, the total enrichment depends only on the displacement distance and the total enrichment of the steady band, not on the isochrone shape. Therefore, the semicontinuous enrichment process can be predicted by knowledge of the variation of the total enrichment vs displacement. By repeating the displacing-cutting-enjecting-displacing cycle important quantities of the more riched mixture will be produced. This manner may be used for refining of isotope concentrated feed.
    Articles
    A STUDY ON THE WETTABILITY OF GELATIN HYDROGELS
    Ma Jiming, Qiang Di, Zhong Bianxiao, Yin Qun
    1984, 5(1):  94-98. 
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    The surface of gelatin hydrogels behaves as a strongly hydrophobic and low-energy surface. The Surface free energy of gelatin hydrogels was estimated by measuring the contact angle of some reference liquids on the gelatin hydrogels.The surfactants,especially the nonionic surfactants, dissolved in the hydrogels,increases the surface free energy and improves pronouncedly the wettability of gelatiin hydrogels. The results are interpreted in terms of adsorption and orientation of molecules on the surface, as well as by the existence of the non-polar network in gelatin hydrogels.
    APPLICATIONS OF DSPF MODEL IN RARE EARTH COMPLEXES (Ⅰ)——ELECTRONIC SPECTRUM OF Yb(Ⅲ) CHELATE
    Yang Pin, Li Huiying
    1984, 5(1):  99-104. 
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    The f-orbital levels of the Ytterbium tris-acetylacetonate were calculated with the Double Sphere Coordination Point Charge Field Model, and the agreement between the calculated and the experimental result of the electronic spectrum is generally good.
    THE INVESTIGATION ON POLYURETHANE/POLYEPOXIDE INTERPENETRATING POLYMER NETWORKS
    Li Yuwei, Li Yiming, Zhang Limei, Yang Hong, Fang Yuan, Zhang Donghua, Jin Shu
    1984, 5(1):  105-110. 
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    In this paper,the synthesis of interpenetrating polymer networks(IPN) based on polyurethane (hydroxy terminated eopolymer of butadiene-acrylonitrile crossliked with 2, 4-tolylene diisocyanate) and polyepoxide (crossliked with DMP-30)by simultaneous method and the influence of various factors on their morphology and glass transition behavior were reported. The curing condition of testing specimen was selected with the aid of JSRtype curelastometer . The morphology and glass transition of the tested material were studied by transmission electron microscopy (TEM) and dynamic mechanical spectroscopy (DMS) techniques respectively and the thermostability and mechanical behavior of the sample were investigated as well. The results show that PU/PEbelongs to inconsistent system. In all the cases, a two-phase morphology emerged and the celluar structure with the cell sizes ranging from 400 Å to 800 Å was found. The damping value is increased and the zone of Tg transition is broadened by adjusting the constituent ratio and adding various chain extender.
    TBA STUDY OF THE CURING PROCESS OF LIQUID HTPB RUBBER (Ⅰ)
    Huang Yuanfu, Chen Fute, Zhu Yuping, Xie Yaoming, Zhao Ming
    1984, 5(1):  111-115. 
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    Torsional Braid Analysis (TBA) is used here to investigate the apparent kinetics of the curing process in the system of hydroxy-termi-nated polybutadiene (HTPB) and tolylene diisocyanate(TDI). The apparent activation energy is obtained. The results are also verified by viscosity measurement and infrared spectroscopy. It is suggested that TBAcan be used as a significant and successful method for investigating the cure reaction of liquid rubber.
    STUDIES ON WHITE POWDERY TUNGSTIC ACID (Ⅱ)——THE PREPARATION OF VARIOUS METATUNGSTATES
    Gu Yidong(Yih-Tong Ku), Song Yuan, Zhu Sisan, Bao Tan
    1984, 5(1):  116-118. 
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    After we successfully prepared white powdery tungstic acid[5] in good yield and high quality, we have found that on account of its intrinsic reactivity, in contrast to the well known tungstic acid in yellow form, the white powdery tungstic acid can not only react directly with phosphoric acid to form 12-tungstophosphoric acid[5],but can also react directly with various weakly alkaline compounds to form a variety of metatungstates.
    MATRIX INTERFERENCES FOR CADMIUM AND POTASSIUM IN A CONSTANT-TEMPERATURE FURNACE
    Zheng Yansheng
    1984, 5(1):  119-121. 
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    In the paper the interferences of A1(NO3)3, Ca(NO3)2, Ni(NO3)2, CaCl2,CuCl,FeCl and ZnCl2 on cadmium and potassium in the constant-temperature furnace were described. The experiment showed that the matrix interferences for cadmium were small. But A1(NO3)3 depressed the absorption of cadmium for Al(NO3)3/Cd(NO3)2 ratio of 3000. The depression of Al(NO3)3 on cadmium was increased with decrease of the concentration of cadmium. The absorption of potassium was enhanced using Al(NO3)3, Ni(NO3)2, CaCl2, CuCl2, FeCl3 and ZnCl2 as matrices.
    THE DETERMINATION OF Mo AND Fe IN Mo-Fe-S CLUSTER COMPOUNDS BY A. A. S. WITH GRAPHITE FURNACL ATOMIZER
    Niu Shuyun, Qin Zhujie, Li Jing, Li Shuqin, Wang Tiegang, Jin Qinhan
    1984, 5(1):  122-124. 
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    Aprocedure was established for the determination of Mo and Fe in Mo-Fe-Scluster compounds by atomic absorption spectrophotometry with graphite furnace atomizer. It has significant advantages over the traditional technigues for the analysis of samples containing less than 1% Mo or Fe or of very small samples.The sensitivities are 10 ppb for Fe and 5 ppb for Mo. There is no interfere between different elements and the pretreatment of sample is simple.The recoveries of both Mo and Fe are 100±5% and the precisions (as variance coefficients) Fe<4% and Mo<2% in the concentration range of 0.1-1.0 ppm Fe or Mo.
    ANALYSIS OF THE INGREDIENTS OF ANGELICA SINENSIS——ANALYSIS OF THE INGREDIENTS OF ESSENTIAL OIL BY CAPILLARY COLUMN GC/MS
    Chen Yaozu, Chen Nengyu, Ma Xueyi, Li Haiquan
    1984, 5(1):  125-128. 
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    In present work, the chemical ingredients of the essential oil of roots of Angelica Sinensis (Oliv.) Diels have been analyzed by capillary column GC/MS. 19, 12 and 6 compounds have been identified from the neutral, phenolic and acidic fractions respectively.Among them 32 constituents have not been found in this species before. By high resolution mass spectrometry and metastable ion scanning technique, the fragmentation pattern of ligustilide, a principal constituent of the essential oil, has been studied.
    Preface
    THE PREPARATION OF THE DERIVATIVES OF a-CHLOROSTYRENE BY THE REACTION OF DIETHYL CHLOROBENZYLPHOSPHONATE WITH ALDEHYDES AND KETONES
    Xu linxiao, Tao Fenggang, Wu Junhe
    1984, 5(1):  129-132. 
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    The derivatives of α-chlorostyrene have been prepared in good yields by the phase transfer catalytic reaction of diethyl chlorobenzylphos-phonate with aldehydes and ketones under the solid-liquid two phase systems. The polyethylene glycol (PEG) was used as the phase transfer catalysts.
    Articles
    MONOCYANOETHYL-β-DIKETONES AND THEIR ISCMERIZATION(Ⅱ)
    Huang Huamin, Li Bao, Zhan Yongfu, Sha Deyou
    1984, 5(1):  133-135. 
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    β-Diketones (butyrylacetone, isobutyrylacetone, isovalerylacetone) were treated with acrylonitrile in the presence of aqueous potassium hydroxide giving monocyanoethylated-β-diketones (Ⅰ)-(Ⅲ), which by heating with HCl were isomerized to the corresponding 3,4-dihydro-2-(1H) pyridones (Ⅳ)-(Ⅵ). (Ⅰ)-(Ⅲ) were hydrolyzed to the ketoacids (Ⅶ)-(Ⅸ). semicarbazone (Ⅹ)-(ⅩⅤ) were prepared from 5-acetyl-6-methyl-3,4dihydyo-2(1H) pyridones; pyrazole(ⅩⅥ)-(ⅩⅨ) were prepared from β-diketoncids. compounds (Ⅰ)-(ⅩⅪ) were reported for the first time.
    PREPARATION AND APPLICATION OF A NEW STRYCHNINE-SELECTIVE LIQUID MEMBRANE ELECTRODE
    Shen Guoli, Yao Shouzhuo, Sun Sui
    1984, 5(1):  136-138. 
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    Anew strychnine-selective liquid membrane electrode made with strychnine-tetra (m-methylphenyl) borate ion-pair complex is developed. The electrode shows Nernstian response down to 5×10-6 M strychnine solutions with a slope of 56mV/concentration decade, and better selectivity than previously published one. Rapid and accurate methods for direct potentiometry or potentiometric titration of strychnine in pharmaceutical preparations are suggested.
    CHARACTERIZATION OF STYRENE-DIMETHYL-SILOXANE BLOCK COPOLYMERS BY THIN LAYER CHROMATOGRAPHY
    Wang Yuanshen, Chen Qingmin
    1984, 5(1):  139-140. 
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    TLChas been used in distinguishing and characterizing polystyrene homopolymer and polystyrene-polydimethylsiloxane diblock or triblock copolymers. When developed with chloform or other suitable developing agents the polymers mentioned above would give different Rf values. This method is independent of the molecular weights and compositions of the samples. It may be used to determine rapidly whether the anionic polymerization reaction is successful.
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