High-molecular-weight isobutene-isoprene copolymers containing unusually high isoprene content

被引：21

作者：

McInenly, PJ ^{[1
]}

Drewitt, MJ ^{[1
]}

Baird, MC ^{[1
]}

机构：

[1] Queens Univ, Dept Chem, Kingston, ON K7L 3N6, Canada

来源：

MACROMOLECULAR CHEMISTRY AND PHYSICS | 2004年 / 205卷 / 13期

关键词：

cationic polymerization; gelation; isobutene-isoprene copolymers; NMR;

D O I：

10.1002/macp.200400188

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 1:2 adduct of the highly electrophilic borane B(C6F5)(3) with n-decanoic (stearic) acid, [n-C17H35CO2H]-[B(C6F5)(3)](2) exhibits sufficiently enhanced acidity that it is an excellent initiator for the carbocationic copolymerization of isobutene with isoprene in methylene chloride and methyl chloride. High conversions to gel free, high-molecular-weight copolymers containing up to 15 wt.-% isoprene are readily obtained, consistent with the anion [n-C17H35CO2-{B3C6F5)(3)}(2)](-) being very weakly coordinating. Thus chain transfer following IP incorporation into the growing polymeric chain. which normally results in low average molecular weights, is much less of a factor here.

引用

页码：1707 / 1712

页数：6

共 19 条

[1]

Al-Malaika S., 1989, Comprehensive Polymer Science, P539

[2] Polymerization of isobutylene and the copolymerization of isobutylene and isoprene initiated by the metallocene derivative Cp*TiMe2(μ-Me)B(C6F5)3 [J].