Living radical polymerization of styrene mediated by a piperidinyl-N-oxyl radical having very bulky substituents

被引：14

作者：

Mannan, Abdul ^{[1
]}

Ichikawa, Ayako ^{[1
]}

Miura, Yozo ^{[1
]}

机构：

[1] Osaka City Univ, Grad Sch Engn, Dept Appl Chem, Sumiyoshi Ku, Osaka 5588585, Japan

来源：

POLYMER | 2007年 / 48卷 / 03期

关键词：

styrene; living radical polymerization; nitroxide;

D O I：

10.1016/j.polymer.2006.12.002

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A new cyclic nitroxide I and the corresponding alkoxyamines 9 and 10 were synthesized and the polymerization of styrene (St) initiated with 10 was investigated. The NO-C bond of 9 is very weak, cleaving at room temperature. On the other hand, alkoxyamine 10 is stable at room temperature and the A(act) and E-act for the NO-C bond homolysis were determined to be 1.4 x 10(15) s(-1) and 124.5 kJ mol(-1), respectively. When the polymerization of St was carried out at 70 degrees C, the resultant poly(St) showed narrow polydispersities below 1.25. In the polymerization at 90 degrees C, the resulting poly(St) showed narrow polydispersity until 60% conversion, but Mw/Mn was rapidly increased above 60% conversion. On the other hand, the polymerization at 120 degrees C gave poly(St) with broad polydispersities. The unusual polymerization behavior was discussed on the basis of the SEC and ESR results. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：743 / 749

页数：7

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