橡胶增强的理论研究  

Theoretical studies on rubber reinforcement

作　　者：吴友平[1] 贾清秀[1] 刘力[1] 张立群[1] 

机构地区：[1]北京化工大学北京市新型高分子材料制备与成型加工重点实验室,北京100029

出　　处：《合成橡胶工业》2004年第1期1-5,共5页China Synthetic Rubber Industry

基　　金：国家自然科学基金资助项目(50303002);教育部博士点项目(20020010004)。

摘　　要：修正的Einstein方程用于描述低填充橡胶的弹性模量,改进的Halpin-Tsai方程可较好预测较高填料体积分数下体系的弹性模量。描述了填料增强橡胶体系应力-应变曲线的4个重要模型:范德华网络模型、双网络模型、JGmC2L方程以及炭黑增强橡胶的链组理论。范德华网络模型以填料聚集体作为增强单元,且认为其可发生塑性变形和破坏;双网络模型强调了填料网络中橡胶分子链的完全伸展和取向对增强的贡献;JGmC2L方程体现了高伸长率时材料结构变化导致有限伸长特性的变化;链组理论以链组而不是单根链作为独立的形变单元。4种模型均有一定的合理性和局限性,有待建立可全面反应材料在整个大形变过程中黏弹性力学行为的新方程。Several models for the Young′s modulus of filler-reinforced rubber were evaluated.The modified Einstein-Smallwood model was only good at low filler concentrations, and the modified Haplin-Tsai equation could predict the modulus of filled elastomers at higher volume fractions.The four models for describing of the tensile stress-strain behaviour of filler-reinforced rubbers:Van der Waals network model,the double network model, a combination of the Langevin-theory-based James-Guth equation with the phenomenological C2 term of the Mooney-Rivlin equation,modified by introducing an additional empirical parameter (JGmC2L equation),and four constituent chains network model,were discussed.Filler agglomerates were considered as reinforcing elements in Van der Waals network model and they could plastically deform.The increase in the finite extensibility parameter with increasing strain in the region of high elongation was ascribed to strain-induced increase in the average network mesh size in JGmC2L equation.The double network model emphasized the contribution of fully extended chains. In the four constituent chains network model,the deformation cell was not a single chain but the constituent chains.All of the four models mentioned above concentrate only on some aspects of reinforcement, and a new equation, which could describe the visco-elastic mechanical behavior during the whole strain range, needed to be developed.

关 键 词：橡胶增强 弹性模量 应力—应变 黏弹性力学 

分 类 号：TQ330.1[化学工程—橡胶工业]