Influence of silica fillers during the electron irradiation of DGEBA/TETA epoxy resins, part II: Study of the thermomechanical properties

被引:17
作者
Benard, F.
Campistron, I.
Laguerre, A.
Vigier, G.
Laval, F.
机构
[1] Univ Maine, LCOM Chim Polymeres UCO2M, UMR 6011, F-72085 Le Mans 9, France
[2] Inst Natl Sci Appl, GEMPPM, F-69621 Villeurbanne, France
[3] CEA Le Ripault, F-37260 Monts, France
关键词
silica filled epoxy resins; electron irradiation; network degradation; thermomechanical behaviour;
D O I
10.1016/j.polymdegradstab.2006.01.023
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
This work describes the influence of silica fillers on the thermomechanical properties of diglycidyl ether of bisphenol A/triethylenetetramine (DGEBA/TETA) epoxy resins during ageing under electron beam irradiation. Whatever be the silica filler (pure micrometric ground and spherical silicas, nanometric silicas and coupling agent treated silicas), the glass transition temperature of the epoxy resins decreases with increasing irradiation dose, meaning that the main effect of the irradiation is chain scission. No influence of the silica fillers has been detected from the changes in the glass transition temperature with the increase in the irradiation dose. The disappearance of the cooperativity of the gamma relaxation, the decrease of the a relaxation and the decrease of the elastic modulus at the rubbery plateau observed by dynamic mechanical analyses involve a decrease in the crosslink density of the epoxy resins. The occurrence of chemical reactions between the epoxy resin and the silica surface at high irradiation doses has been shown. Moreover, we show evidence that chemical reactions between the epoxy resin and the silica surface occur at high irradiation dose. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2119 / 2125
页数:7
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