Influence of ageing of neodymium based Ziegler-Natta catalyst on butadiene polymerization

被引：5

作者：

Mello, Ivana L. ^{[2
]}

Soares, Bluma G. ^{[2
]}

Coutinho, Fernanda M. B. ^{[1
]}

Nunes, Denise S. S.

机构：

[1] Univ Estado Rio De Janeiro, Inst Quim, Dept Proc Quim, BR-20559900 Rio De Janeiro, Brazil

[2] UFRJ, Inst Macromol, Rio De Janeiro, Brazil

来源：

POLIMEROS-CIENCIA E TECNOLOGIA | 2007年 / 17卷 / 01期

关键词：

high-cis polybutadiene; Ziegler-Natta catalyst; neodymium; catalyst ageing;

D O I：

10.1590/S0104-14282007000100014

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Catalysts aged for different time periods (0, 5, 15, 40, 80 and 160 days) and different temperatures (10, 25 and 40 degrees C) were tested in the cis-1,4 polymerization of 1,3-butadiene. The catalytic activity and polymer characteristics (molecular weight and microstructure) were evaluated. The results showed that the catalyst ageing did not affect the polymer microstructure. The cis-1,4 content remained at 98%, trans-1,4 at 1,4% and vinyl units at 0,6%. However, the catalysts aged for 40 days produced polybutadienes with higher molecular weight. Also observed was a tendency to an increased polymerization conversion by the catalysts aged at 25 degrees C.

引用

页码：62 / 66

页数：5

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