二氧化钛交联三元乙丙橡胶复合材料及其性能

Preparation and Characterization of EPDM Composite Crosslinked with Titanium Dioxide

通过溶液沉淀法制备了二氧化钛交联的三元乙丙橡胶(EPDM)复合材料,扫描电镜和溶解、溶胀结果表明二氧化钛有效地交联了EPDM基体,全反射傅立叶红外光谱表明偶联剂修饰二氧化钛颗粒和EPDM接枝马来酸酐是有效交联的重要原因。随着二氧化钛填充量的增加,使基本无力学性能的三元乙丙橡胶力学强度提高到6.2 MPa,断裂伸长率提高到2435%,热分解温度提高20℃,进一步增加填充量,由于粒子之间的聚集而使复合材料性能下降。

Ethylene-propylene-diene monomer（EPDM） composite crosslinked with titanium dioxide modified with γ-methacryloxypropyl trimethoxysilane（MPS） was prepared through solution-precipitation method.SEM and swelling,solution results indicated that EPDM was remarkably crosslinked with titanium dioxide.And this crosslinking structure was related with the existence of coupling agent in the surface of titanium dioxide and maleic anhydride in the macromolecule chain of EPDM.With the increase of titanium dioxide content,the mechanical properties of EPDM/TiO2 composite with 7.5% content were greatly improved from very low to 6.2 MPa,the elongation at break was enhanced to 2435%,and the decomposition temperature was increased about 20 ℃.Due to the aggregation in TiO2 particles,the properties of composite would come down.This method for cross linking EPDM can be extended for other matrix with inorganic filler.