EPDM-g-MAH/CaCO3复合材料力学及热老化性能的表征

以二甲苯为溶剂,溶液法制备马来酸酐(MAH)接枝EPDM,并向溶液中加入适量碳酸钙(C aCO3),与已接枝的马来酸酐(MAH)反应。待反应完全后,以丙酮为沉淀剂,得到EPDM-g-MAH/C a-CO3弹性体复合材料。溶胀及拉伸性能测试结果表明,复合材料形成有效交联,且材料的拉伸强度、断裂伸长率和模量均得到大幅提高,且在C aCO3含量达到体系总质量的20%时,复合材料呈现最佳力学性能。认为,上述实验结果是因为碱性的C aCO3的C a2 可以与接枝在EPDM上的MAH发生配合反应,进而成为EPDM的交联中心,形成有效交联,从而促进了EPDM力学性能的提高,ATR-FT-IR的测试结果被用于证实上述观点。文中还对复合材料的热氧老化性能进行了测试。

Study on Mechanical and Thermal Ageing Property EPDM-g-MAH/CaCO3 Composites

In this paper,a new method was applied to form crosslinking networks in the ethylene-propylene-diene terpolymer(EPDM) matrix with calcium carbonate(CaCO_3) particles,which were chemically treated by maleic anhydride(MAH).The tensile test shows that the tensile strength and the elongation at break of the composites are improved significantly and when the content of CaCO_3 is about 20% in the composites,the maximum tensile properties are achieved.The results of swell text show that the composites have founded evident crosslinking structure.The results of ATR-FT-IR spectrum show that the acid-base reaction between CaCO_3 and MAH has happened.