CHARACTERISTICS OF ETHYLENE-PROPYLENE AND PROPYLENE-1-BUTENE COPOLYMERIZATION OVER TICL3.1/3ALCL3-AL(C2H5)2CL

被引:37
作者
KAKUGO, M
MIYATAKE, T
MIZUNUMA, K
KAWAI, Y
机构
[1] Sumitomo Chemical Co, Japan
关键词
Butenes--Polymerization - Catalysts - Ethylene--Polymerization - Propylene--Polymerization - Titanium Compounds--Applications;
D O I
10.1021/ma00186a002
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
An ethylene-propylene (13EP) copolymer containing 0.41 mol % 13C-enriched ethylene has been fractionated on an isotactic basis by a temperature-programmed elution column technique. The 13C NMR analysis of the fractions indicates that the ethylene content decreases as the isotacticity increases. The atatic fraction eluted at 20°C is about 6 times as high in ethylene content as the isotactic fractions eluted over 110°C. This fact well accounts for a wide copolymer composition distribution generally found in ethylene-propylene copolymerization prepared with heterogeneous catalysts. A 1-butene-propylene (13BP) copolymer containing 0.20 mol % 13C-enriched 1-butene has been examined similarly. In this case, the 1-butene content of the fractions is almost uniform.
引用
收藏
页码:2309 / 2313
页数:5
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