交联EPR的动态流变及蠕变行为

Dynamical rheology and creep behavior in the cross-linked ethylene-propylene random copolymer

采用原位聚合一步法合成乙烯-丙烯无规共聚物(EPR),并加入1,9-癸二烯(DD)使EPR形成交联结构。通过小振幅震荡剪切流变的方法研究了交联程度不同的EPR的动态流变行为。实验结果表明,随DD含量的增加,EPR的交联程度增大,储能模量和损耗模量均随之增加,黏度逐渐增大,并出现明显的末端平台。随交联程度的增大,EPR的应变逐渐减低,弹性逐渐增加,自身的抗蠕变能力逐渐增强。交联程度高的EPR的抗蠕变性能可以提高材料的耐疲劳性,延长材料的使用寿命,拓宽EPR的应用领域。

Ethylene-propylene random copolymer（EPR） was synthesized through in situ one-step polymerization, and the cross-linked structure was formed in EPR by adding 1, 9-decadiene（DD）. Dynamical rheology of various EPR was studied with small amplitude oscillatory shear. The results show that the crosslinking degree increased with the increasing addition of DD. The storage modulus, loss modulus and viscosity increased correspondingly and a terminal platform occurred obviously. As the increasing of crosslinking degree, creep strain of EPR decreased and the elasticity increased, it was indicated that the creep resistance was enhanced. A high crosslinking degree of EPR can improve the creep resistance and fatigue resistance of materials, prolong the service life of materials and broaden the application field of EPR.