脆性高聚物的银纹化增韧设计  

Crazing Toughening Design of Brittle Polymer Solids

作　　者：罗文波[1] 杨挺青[2] 

机构地区：[1]湘潭大学基础力学与材料工程研究所,湖南湘潭411105 [2]华中科技大学力学系,湖北武汉430074

出　　处：《材料科学与工程》2002年第3期422-424,413,共4页Materials Science and Engineering

基　　金：国家自然科学基金资助项目 ( 10 172 0 3 7)

摘　　要：银纹化是脆性高聚物的一种典型的非线性变形方式。银纹在其引发、生长和断裂过程中消耗大量能量 ,对高聚物的增韧设计十分重要。考虑银纹细观结构特征的银纹生长和断裂规律是研究银纹增韧机制的核心内容。根据国内外近期的若干研究进展 ,基于对承载高聚物中的银纹断裂及其与裂纹扩展的相互作用等问题的分析 ,从理论上探讨将材料断裂韧性与其微观控制参数 (如分子量 ,缠结密度等 )联系起来 。Crazing is a typical kind of nonlinear deformation in brittle polymers. Great energy must be consumed during craze initiation, growth and fracture, thus crazing is very important for polymer toughening design. The craze growth and fracture laws concerning with the craze architecture are the core of craze toughening mechanism. The recent advances in the studies on craze fracture and its interaction with cract growth in loaded polymer solids have been reviewed in this paper. Meanwhile, the macroscale fracture toughness was interconnected theoretically with its microscale control parameters, such as molecular weight and entanglement density. Therefore it's possible to design the toughness of brittle polymers via these microscale control parameters.

关 键 词：脆性高聚物 设计 银纹化 增韧 非线性变形 断裂韧性 微观结构 

分 类 号：TQ316.6[化学工程—高聚物工业] TQ311