Syndiospecific polymerization of styrene with embedded metallocene catalysts

被引：8

作者：

Chung, JS

Woo, BG

Choi, KY ^{[1
]}

机构：

[1] Univ Maryland, Dept Chem Engn, College Pk, MD 20742 USA

[2] Ulsan Univ, Sch Xhem Engn & Bioengn, Mugeodong, Nam gu, Ulsan 680749, South Korea

[3] LG Chem Res Pk, 104 1 Moonji dong, Yusong gu, Taejon 305380, South Korea

来源：

MACROMOLECULAR SYMPOSIA | 2004年 / 206卷

关键词：

gelation; metallocene catalysts; phase transition; polymerization; styrene; syndiotactic polystyrene;

D O I：

10.1002/masy.200450229

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Syndiotactic polystyrene (sPS) is a highly crystalline polymer with high melting point (270degreesC). The syndiospecific polymerization of styrene to sPS with metallocene catalysts is characterized by significant phase changes that lead to global gelation. Since sPS does not dissolve in styrene or solvents such as toluene and n-heptane, sPS precipitates out immediately from the liquid phase with the start of polymerization. The polymer crystallites aggregate to primary particles and they develop to a gel. The gelation is not due to cross-linking polymerization but due to strong molecular interactions between the polymer and monomer molecules. In this work, homogeneous Cp*Ti(OMe)3 catalyst is heterogenized or embedded into sPS prepolymer particles. The embedded catalyst has been tested in a laboratory scale diluent slurry process to illustrate the feasibility of slurry phase polymerization for the synthesis of sPS particles

引用

页码：375 / 382

页数：8

共 20 条

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