BIMODAL MOLECULAR-WEIGHT DISTRIBUTION IN CARBOCATIONIC SYSTEMS WITH FREE IONS AND ION-PAIRS OF EQUAL REACTIVITIES BUT DIFFERENT LIFETIMES

被引：24

作者：

MATYJASZEWSKI, K ^{[1
]}

SZYMANSKI, R ^{[1
]}

TEODORESCU, M ^{[1
]}

机构：

[1] POLISH ACAD SCI,CTR MOLEC & MACROMOLEC STUDIES,PL-90363 LODZ,POLAND

来源：

MACROMOLECULES | 1994年 / 27卷 / 26期

关键词：

D O I：

10.1021/ma00104a010

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Monte Carlo calculations and numerical integrations are used to study molecular weight distribution (MWD) in carbocationic polymerization and to illustrate the effect of equilibrium constants, rate constants, and concentration of common ions on MW and MWD. It is demonstrated that bimodal molecular weight distribution is obtained when exchange between ions and ion pairs of similar reactivities is slow and their lifetimes are sufficiently different. Bimodal MWD is converted to narrow (Poisson) distribution in the presence of salts with common ions; molecular weights in these systems grow linearly with conversion like in living polymerization.

引用

页码：7565 / 7574

页数：10

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