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

被引：0

作者：

Mello, Ivana L. ^{[1
]}

Soares, Bluma G. ^{[1
]}

Coutinho, Fernanda M. B. ^{[2
,3
]}

Nunes, Denise S. S. ^{[2
]}

机构：

[1] Instituto de Macromoléculas, UFRJ

[2] Departamento de Processos Químicos, UERJ

[3] Departamento de Processos Químicos, Instituto de Química, Pavilhão Haroido Lisboa da Cunha, CEP: 20559-900, Rio de Janeiro, RJ

来源：

Polimeros | 2007年 / 17卷 / 01期

关键词：

Catalyst ageing; High-cispolybutadiene; Neodymium; Ziegler-Natta catalyst;

D O I：

10.1590/s0104-14282007000100014

中图分类号：

学科分类号：

摘要：

Catalysts aged for different time periods (0, 5, 15, 40, 80 and 160 days) and different temperatures (10, 25 and 40°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°C.

引用

页码：62 / 66

页数：4

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