Isobutene polymerization and copolymerization with isoprene initiated by [Cp*TiMe2]+ in the presence of a novel type of weakly coordinating counteranion

被引：24

作者：

Tse, CKW ^{[1
]}

Kumar, KR ^{[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 / 11期

关键词：

cationic polymerization; initiators; isoprene; titanium; Ziegler-Natta polymerization;

D O I：

10.1002/macp.200400053

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 highly electrophile borane B(C(6)F(5))(3) reacts with octadecanoic acid (n-C(17)H(35)CO(2)H, stearic acid) to form 1:1 and 2:1 adducts [n-C(17)H(35)CO(2)H][B(C(6)F(5))(3)] and [n-C(17)H(35)CO(2)H][B((6)F(5))(3)](2.) These adducts exhibit enhanced acidities, and react with Cp*TiMe(3) in methylene chloride and toluene to give methane and the complexes [Cp*TiMe(2)]-[n-C(17)H(35)CO(2){B(C(6)F(5))(3)}(1,2)]; the 2:1 complex in particular is a very good initiator for the carbocationic polymerization of isobutene (IB) and copolymerization of IB with isoprene at temperatures as high as -30degrees. High conversions to high molecular weight homo- and copolymers are obtained, consistent with the anion [n-C(17)H(35)CO(2){B(C(6)F(5))(3)}(2)](-) being very weakly coordinating.

引用

页码：1439 / 1444

页数：6

共 28 条

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