Synthesis and characterization of syndiotactic 3,4-polyisoprene prepared with diethylbis(2,2′-bipyridine)iron-MAO

被引：66

作者：

Bazzini, C

Giarrusso, A

Porri, L

Pirozzi, B

Napolitano, R

机构：

[1] Politecn Milan, Dipartimento Chim Ingn Chim & Mat, I-20133 Milan, Italy

[2] Univ Naples Federico II, Dipartimento Chim, I-80126 Naples, Italy

来源：

POLYMER | 2004年 / 45卷 / 09期

关键词：

isoprene; iron-based catalysts; 3,4 syndiotactic polyisoprene;

D O I：

10.1016/j.polymer.2004.02.042

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The soluble system diethylbis(2,2'-bipyridine)Fe-MAO is very active for the polymerization of isoprene to predominantly 3,4 polymers (ca. 80%). The polymers obtained at 25 degreesC are amorphous by X-ray examination, while those obtained below 10 degreesC are crystalline. The identity period determined from the X-ray fiber spectrum, ca. 5.2 Angstrom, and the NMR analysis show that the polymer contains stereoregular sequences of 3,4 syndiotactic structure. An interpretation is given of the effect of polymerization temperature on stereospecificity. Some differences between the 1,2 polymerization of butadiene and the 3,4 polymerization of isoprene are examined. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：2871 / 2875

页数：5

共 22 条

[1] SYNDIOTACTIC 1,2-POLYBUTADIENE WITH CO-CS2 CATALYST SYSTEM .2. CATALYSTS FOR STEREOSPECIFIC POLYMERIZATION OF BUTADIENE TO SYNDIOTACTIC 1,2-POLYBUTADIENE [J].