Solvent effect on TEMPO-mediated living free radical dispersion polymerization of styrene

被引：37

作者：

Shim, SE ^{[1
]}

Oh, S ^{[1
]}

Chang, YH ^{[1
]}

Jin, MJ ^{[1
]}

Choe, S ^{[1
]}

机构：

[1] Inha Univ, Dept Chem Engn, Inchon 402751, South Korea

来源：

POLYMER | 2004年 / 45卷 / 14期

关键词：

nitroxide-mediated living radical polymerization; dispersion polymerization; polystyrene;

D O I：

10.1016/j.polymer.2004.05.011

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Living free radical dispersion polymerization of styrene in the presence of 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) and 2,2-azobisisobutyronitrile (AIBN) was conducted in various glycol media having different solubility parameters. Genuine heterogeneous polymerization nature was observed from the initial stage of the reaction. The solubility parameter of the media was found to significantly influence the living characteristics of the polymerization including the polymerization kinetics and the molecular weight evolution at a fixed concentration of TEMPO. A grafting of stabilizer molecules onto monomer and a possible partitioning of TEMPO between the continuous medium and particle phase were postulated for the deviation of the experimentally obtained molecular weight from the calculated value. For a poor medium for styrene. such as diethylene glycol, the living nature was achieved by increasing the amount of TEMPO. The polystyrene (PS) microsphere was well obtained in all tested glycol media and the average size was increased with enhanced affinity of the media to styrene and with decreasing concentration of TEMPO. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：4731 / 4739

页数：9

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