杜仲橡胶硫化胶交联密度与结晶性能关系研究

采用差示扫描量热（DSC）法分析杜仲橡胶硫化胶交联密度对其物理性能和结晶性能的影响。结果表明：随着硫黄用量的增大，杜仲橡胶硫化胶的交联密度增大，邵尔A型硬度减小，100%定伸应力、拉伸强度和拉断伸长率先增大后减小；消除热历史后杜仲橡胶生胶的结晶特征减弱；随着交联密度的增大，硫化胶的DSC特征熔融峰减弱直至消失，结晶峰钝化，峰面积减小。;The effect of cross-linking density of gutta-percha rubber vulcanizate on its physical properties and crystallization characteristics was investigated by differential scanning calorimetry（DSC） method.The results showed that，as the addition level of sulfur increased，the cross-linking density of gutta-percha rubber vulcanizate increased，the Shore A hardness decreased，and the modulus at 100% elongation，tensile strength and elongation at break were increased at first and then decreased.After eliminating thermal history，the crystallization characteristic of gum rubber was weakened.When the cross-linking density increased，the melting peaks were weakened until they disappeared，the crystallization peaks became small and broad，and the area of crystallization peak decreased