FREE-RADICAL POLYMERIZATION OF METHYL-METHACRYLATE INITIATED BY THIOL ALONE

被引：9
作者：
XIA, P
CHENG, H
YAN, D
机构：
[1] SHANGHAI JIAO TONG UNIV,DEPT APPL CHEM,SHANGHAI 200030,PEOPLES R CHINA
[2] HUZHOU TEACHERS COLL,ZHEJIANG,PEOPLES R CHINA
来源：
JOURNAL OF APPLIED POLYMER SCIENCE | 1992年 / 45卷 / 04期
关键词：
D O I：
10.1002/app.1992.070450403
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Three different alkyl thiols, i.e., n-propylthiol, isopropylthiol, and 2-methyl-2-undecanethiol, were proved efficient to initiate the polymerization of methyl methacrylate at 40-degrees-C. The initial polymerization rate, R(p), increases with increasing thiol concentration but cannot be described by a single-power law. However, R(p) is proportional to 1.3th power of the monomer concentration, indicating the participation of monomer in the initiation reaction. With increase of the polarity of solvents, R(p) decreases, demonstrating the polar property of the initiating intermediate. The apparent activation energy of overall polymerization was calculated to be 9.3 kcal/mol. Molecular weight measurements indicated the twofold function of the thiol as both an initiator and a regulator.
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收藏
页码：579 / 582
页数：4
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