iPP/EPR共混物的非等温结晶行为及力学性能

Non-Isothermal Crystallization Behaviors and Mechanical Properties of iPP/EPR Blends

采用熔融共混的方法制备了等规聚丙烯（iPP）／乙烯-丙烯无规共聚物（EPR）共混物，利用差示扫描量热仪（DSC）及拉伸试验研究了EPR对iPP非等温结晶行为及力学性能的影响。结果表明，iPP．EPR及iPP／EPR共混物的非等温结晶过程均可用莫志深动力学方程来描述；EPR的质量分数小于10％时。EPR对iPP起到了降黏剂的作用，使得共混体系中iPP的结晶温度、结晶度及结晶速率均有所提高，而共混物断裂伸长率有所下降；当EPR的质量分数在10％～30％时，iPP结晶速率和结晶度降低，屈服韧性提高。

iPP/EPR blends were prepared by melt blending. The effect of EPR on the non-isothermal crystallization behaviors and mechanical properties of iPP was investigated by using differential scanning calorimetry （DSC） and tensile tests. The results show that the non-isothermal crystallization processes of iPP,EPR and iPP/EPR blends can be de- scribed using the kinetic equation of MO Zbi-shen. EPR acts as the viscosity reducer for iPP,and the crystallization temperature, crystallinity and crystallization rate increase, but the elongation at break decreases when the mass fraction of EPR is less than 10%. When the mass fraction of EPR is 10%～30%, the crystallization rate and the crystallinity of iPP decrease and the yield toughness of iPP increases.