The effect of end groups on the thermal degradation of poly(methyl methacrylate)

被引：74

作者：

Hu, YH ^{[1
]}

Chen, CY ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Dept Chem Engn, Tainan 70101, Taiwan

来源：

POLYMER DEGRADATION AND STABILITY | 2003年 / 82卷 / 01期

关键词：

PMMA degradation; activation energy; blocking effect;

D O I：

10.1016/S0141-3910(03)00165-4

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The thermal degradation of poly(methyl methacrylate) was studied using a system of thiols as initiators. Depolymerization is the dominant reaction in the thermal degradation of such polymers, according to thermal analysis. The degradation mechanism involves only main-chain scission. Three methods of degradation were applied to elucidate the thermal degradation behaviour. The activation energy for the degradation of PMMA-thiols is 170 kJ/mol, higher than that of PMMA-AIBN (60 kJ/mol), as measured by the Flynn method. According to Ozawa's method, the activation energy is 210 kJ/mol higher than that of an AIBN-initiated polymer (148-151 kJ/mol). By Kissinger's measurement method, this system has a frequency factor (similar to10(10)) five orders of magnitude higher than the ordinary PMMA (similar to10(5)). The observed results are explained as a "blocking effect". (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：81 / 88

页数：8

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