"Uni et Trini": In Situ Diversification of (Pyridylamide)hafnium(IV) Catalysts

被引：58

作者：

Busico, Vincenzo ^{[2
]}

Cipullo, Roberta ^{[2
]}

Pellecchia, Roberta ^{[2
]}

Rongo, Ltica ^{[2
]}

Talarico, Giovanni ^{[2
]}

Macehioni, Alceo ^{[3
]}

Zuccaccia, Cristiano ^{[3
]}

Froese, Robert D. J. ^{[4
]}

Hustad, Phillip D. ^{[1
]}

机构：

[1] Dow Chem Co USA, Freeport, TX 77541 USA

[2] Univ Naples Federico 2, Dept Chem, I-80126 Naples, Italy

[3] Univ Perugia, Dept Chem, I-06123 Perugia, Italy

[4] Dow Chem Co USA, Midland, MI 48674 USA

来源：

MACROMOLECULES | 2009年 / 42卷 / 13期

关键词：

OLEFIN POLYMERIZATION CATALYST; PROPENE POLYMERIZATION; METALLOCENE CATALYSTS; C BOND; ACTIVATION; INSERTION; COPOLYMERS; DISCOVERY; BEHAVIOR; ALKENE;

D O I：

10.1021/ma900780x

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 study was conducted to demonstrate in situ diversification of (pyridylamide)hafnium(IV) catalysts. An extensive density functional theory (DFT) study was conducted for several C 1-symmetric and C s-symmetric precatalysts to investigate the diversification of the (pyridylamide)hafnium(IV) catalysts. The study also investigated propylene polymerizations were investigated with two catalysts to find evidence of multisite behavior. It was observed that catalyst systems 1/Ph 3C][B-(C 6F 5) 4] and 2/Ph 3C][B(C 6F 5) 4] produced polypropylene samples with broad molecular weight distributions.

引用

页码：4369 / 4373

页数：5

共 32 条

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