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Citation: CHAO SHAN-KONG, TONG HSUEN-MING, YANG CHAO-HSUING. SYNTHESIS OF C/S-1,4-POLYBUTADIENE WITH SOLUBLE CATALYSTS——Ⅱ. COBALT COMPOUNDS-ALUMINUM ALKYL CATALYSTS[J]. Acta Polymerica Sinica, ;1964, 6(2): 87-94. shu

SYNTHESIS OF C/S-1,4-POLYBUTADIENE WITH SOLUBLE CATALYSTS——Ⅱ. COBALT COMPOUNDS-ALUMINUM ALKYL CATALYSTS

In this work，the systems of cobalt compounds-aluminum alkyls were used in the polymerization of butadiene to study the catalytic acdvity and the microstructure of the polymers．The results showed： (1) The catalytic system of cobalt complex of the outer orbital type,such as CoX2Py，(RC00)2CoPy，cobalt acetylacetonate，etc．with (i-C4H9)2AlCl，(C2H5)2AlCl and (C2H5)2AlBr，is highly active for polymerizing butadiene；however，it can not form a stereospecific catalyst with(C2H5)2AlI．The content of cis-1，4-structure is higher then 92％． (2) The activity of the system of inner orbital type cobalt complex with (i-C4H9)2AlCl，(C2H5)2AlCl，and (C2H5)2AlBr is lower than the outer orbital type,but the catalyst has nO remarkable eftect oil the microstructure of poly-mers． (3) The order of the substituent halogen in R2AlX for increasing average mole-culer weight of the polymer products is Cl>Br>I． (4) At a definite mole ratio of H2O：(i-C4H9)3Al or C2H5AlCl2 it forms with CoCl2·4C5H5N a highly active stereo-specific catalyst for the polymerization of butadiene．The results were analysed and dis-cussed．
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