Fracture toughness of epoxy resins modified with polyethersulfone: Influence of stoichiometry on the morphology of the mixtures

被引：0
|
作者：
Andres, MA [1 ]
Garmendia, I [1 ]
Valea, A [1 ]
Eceiza, A [1 ]
Mondragon, I [1 ]
机构：
[1] Univ Basque Country, Escuela Univ Ingn Tecn Ind, Dept Ingn Quim & Medio Ambiente, San Sebastian 20011, Donostia, Spain
来源：
JOURNAL OF APPLIED POLYMER SCIENCE | 1998年 / 69卷 / 01期
关键词：
epoxy mixtures; stoichiometry; polyethersulfone; morphology; toughness;
D O I：
暂无
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Toughened mixtures containing 15 wt % polyethersulfone were made with diglycicdyl ether of bisphenol-A resin and 4,4'-diaminodiphenylmethane curing agent, with amine/epoxy group stoichiometric ratios varying from 0.6 to 1.5. Fracture behavior of the modified mixtures has been investigated as a function of the stoichiometry in the matrix. Morphology has been analyzed by transmission and scanning electron microscopy. The increase of amine content in the matrix results in a further increased fracture toughness. This behavior has been related to the changes on the ductility of the matrix upon stoichiometric ratio, but also to the changes on microstructural features of the modified mixtures as stoichiometric amine/epoxy group ratio increased. These morphological changes have been interpreted in terms of spinodal decomposition during curing of the epoxy matrix. (C) 1998 John Wiley & Sons, Inc.
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页码：183 / 191
页数：9
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