POSSIBLE MODEL FOR CHAIN END CONTROL OF STEREOREGULARITY IN THE ISOSPECIFIC HOMOGENEOUS ZIEGLER-NATTA POLYMERIZATION

被引：58

作者：

VENDITTO, V ^{[1
]}

GUERRA, G ^{[1
]}

CORRADINI, P ^{[1
]}

FUSCO, R ^{[1
]}

机构：

[1] CTR RIC NOVARA,IST GUIDO DONEGANI,I-28100 NOVARA,ITALY

来源：

POLYMER | 1990年 / 31卷 / 03期

关键词：

catalytic model; chain end control; conformational analysis; insertion mechanism; homogeneous Ziegler-Natta polymerization; isospecificity;

D O I：

10.1016/0032-3861(90)90398-I

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 conformational study of a possible model for chain end control in the homogeneous isotactic specific Ziegler-Natta polymerization is presented. The model site consists of a complex with two ligands (olefin and growing chain) besides two cyclopentadienyl ligands. The geometries corresponding to the located energy minima are very similar to those of the chiral model previously proposed by us for the site control in the homogeneous isospecific Ziegler-Natta polymerization. In this case the diastereoisomeric intermediates for isotactic and syndiotactic propagation are energetically similar but, according to our assumptions, the insertion path for the propene would be easier in the case of isotactic propagation. © 1990.

引用

页码：530 / 537

页数：8

共 26 条

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