METALLOCENE POLYPROPYLENE STRUCTURAL RELATIONSHIPS - IMPLICATIONS ON POLYMERIZATION AND STEREOCHEMICAL CONTROL MECHANISMS

被引：383

作者：

EWEN, JA ^{[1
]}

ELDER, MJ ^{[1
]}

JONES, RL ^{[1
]}

HASPESLAGH, L ^{[1
]}

ATWOOD, JL ^{[1
]}

BOTT, SG ^{[1
]}

ROBINSON, K ^{[1
]}

机构：

[1] UNIV ALABAMA,DEPT CHEM,TUSCALOOSA,AL 35487

来源：

MAKROMOLEKULARE CHEMIE-MACROMOLECULAR SYMPOSIA | 1991年 / 48-9卷

关键词：

D O I：

10.1002/masy.19910480121

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A series of group 4 metallocenes possessing chiral ligand environments have been characterized and their structures are compared with their propylene polymerizations. Isotactic, syndiotactic, hemiisotactic, and atactic polypropylenes are produced selectively with chiral monoalkyl metallocene cations paired with perfluorotetraphenyl borate; analogous to the results obtained using methylaluminoxane as a cocatalyst. The relative catalyst stereospecificities suggest specific pi-face selectivities and nonbonded contacts. Trends with solvents, temperatures, and catalyst structures are consistent with contact ion pairing for iPr[CpFlu]Zr-P(+) in liquid propylene. The specificities of differently structured metallocenes imply chain-migratory monomer addition reactions.

引用

页码：253 / 295

页数：43

共 45 条

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