共混时间对动态硫化EPDM/PP体系结构与性能的影响

研究了共混时间对动态硫化EPDM/PP体系结构、静态以及动态力学性能的影响。试验结果表明，随着共混时间的延长，EPDM/PP体系中PP相的结晶度先减小后增大，当共混时间为15 min时，PP相的结晶度最小，PP的晶格结构未变化；EPDM相的交联密度逐渐增大，直至趋于一定值；EPDM的T_g峰向高温区移动；PP的T_g峰变化不明显，其tanδ峰值在共混时间为15 min时最大；共混时间为12 min时EPDM/PP体系的力学性能最佳。;The effect of the blending time on the structure，the static and dynamic mechanical properties of dynamically vulcanized EPDM/PP blend was investigated.The results showed that the crystallinity of PP phase in the blend decreased at first，and then increased and the crystal structure of PP did not change as the blending time increased；the minimum crystallinity of PP phase was obtained when EPDM/PP was blended fo r 15 min；the crosslink density of EPDM phase increased gradually up to a certain level；the T_g peak of EPDM shifted to the high temperature region；the T_g peak of PP changed little，and its tanδ peak was obtained when EPDM/PP was blended for 15 min；and the optimal mechanical properties of blend were obtained when EPDM/PP was blended for 12 min