相对分子质量变化对杜仲橡胶应力-应变行为的影响  

Effect of gutta-percha molecular weight on its stress-strain behavior

作　　者：李翔[1] 李良萍[1] 薛兆弘[1] 严瑞芳[1] 

机构地区：[1]中国科学院化学研究所,北京100080

出　　处：《橡胶工业》2002年第7期389-392,共4页China Rubber Industry

摘　　要：研究了相对分子质量分布较宽的一组杜仲橡胶分级样品的应力 应变关系 ,揭示了杜仲橡胶随相对分子质量变化而出现脆性 塑性 韧性转变 ,确认了杜仲橡胶脆性 塑性转变的相对分子质量区域。试验结果表明 ,脆性 塑性转变过渡区内 ,杜仲橡胶力学性能不稳定 ;随着相对分子质量增大 ,拉伸强度和扯断伸长率表现为先增大 ,达到最大值后逐渐减小。The stress strain curves of a set of gutta percha fractions with broader molecular weight distribution were investigated,the transition of gutta percha from brittle to plastic,and then to dutile was revealed with the change of its molecular weight,and the molecular weight range,responding to which gutta percha transited from brittle to plastic,was established.The results showed that the mechanical properties of gutta percha in the brittle to plastic transition area were unstable,and the tensile strength and elongation at break increased up to the maximum values and then decreased gradually.

关 键 词：杜仲橡胶 应力-应变行为 相对分子质量 分级 力学性能 

分 类 号：TQ332.2[化学工程—橡胶工业]