Copolymerization of propene and 1-hexene with isospecific and syndiospecific metallocene catalysts

被引：15
|
作者：
Kim, I [1 ]
Kim, YJ [1 ]
机构：
[1] Univ Ulsan, Dept Chem Engn, Ulsan 680749, South Korea
来源：
POLYMER BULLETIN | 1998年 / 40卷 / 4-5期
关键词：
D O I：
10.1007/s002890050271
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Copolymerization of propene and 1-hexene has been carried out in toluene at 30 degrees C in the presence of homogeneous methylaluminoxane (MAO)-activated 3 ansa-metallocenes, highly syndiospecific iPr(Cp)(Flu)ZrMe2 ((1) under bar), lower syndiospecific Et(Cp)(Flu)ZrMe2 ((2) under bar), and isospecific rac-(EBTHI)/ZrMe2 ((3) under bar), in order to study the role of catalyst stereospecificity on comonomer incorporation. The incorporation of I-hexene decreases in the following order: highly syndiospecific (1) under bar/MAO catalyst > lower syndiospecific (2) under bar/MAO catalyst > isospecific (3) under bar/MAO catalyst. Ail copolymer chains contain the comonomer in nearly random distribution. The copolymers produced by (1) under bar/MAO and (3) under bar/MAO catalysts were composed of uniform chains, but that by (2) under bar/MAO was fractionated into many fractions in the solvent extraction. Considerable rate enhancements were recorded in the copolymerization when the feed ratio of 1-hexene to propene is around 0.6 for all catalysts.
引用
收藏
页码：415 / 421
页数：7
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