Fracture behaviour and deformation mechanisms of polyimide/silica hybrids

被引：7

作者：

Ragosta, G ^{[1
]}

Musto, P ^{[1
]}

Abbate, M ^{[1
]}

Russo, P ^{[1
]}

Scarinzi, G ^{[1
]}

机构：

[1] CNR, ICTP, I-80078 Naples, Italy

来源：

MACROMOLECULAR SYMPOSIA | 2005年 / 228卷

关键词：

hybrids; morphology; polyimides; sol-gel; toughness;

D O I：

10.1002/masy.200551026

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Films of particulate polyimide-silica hybrids were produced by a sol-gel process and were examined in terms of morphological structure and fracture properties at different temperatures, varying from 20 to 250 degrees C. The fracture toughness characteristics were studied by the "Essential Work of Fracture" method using double edge-notched specimens of different ligament lengths. The results showed that the fracture toughness, expressed through the essential (w(e)) and non-essential work of fracture (beta w(p)) parameters increased when submicron silica particles were dispersed in the polyimide matrix. In particular, it was found that both w(e) and beta w(p) increased with temperature to a larger extent than the parent polyimide. This enhancement in the fracture toughness was attributed to extensive cavitations and shear yielding originating at the particle interface and within the matrix.

引用

页码：287 / 298

页数：12

共 31 条

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