氟橡胶/环氧丙烯酸酯橡胶共混物的双连续相形态和性能

摘要

Fluoroelastomer(FKM) and epoxy acrylate elastomer(EACM) blends were prepared by melt blending through a twin-screw extruder. Morphology, thermal properties, dynamic mechanical properties were investigated and confirmed by transmission electron microscopy (TEM) and dynamic mechanical thermal analysis. The effects of the composition ratios on mechanical properties were studied. TEM showed that FKM/EACM blends exhibited a perfect co-continuous phase structure in a limited range of blending ratio, where EACM formed a network in FKM matrix. The morphology of FKM/EACM blends demonstrated a different network size with the change of EACM amount. A fine and complete network structure of EACM in FKM matrix was achieved at the mass ratio of FKM/EACM 80/20. Mechanical testing indicated a synergistic effect at the FKM/EACM 80/20 with maximal values for both the tensile strength and the tear strength.%采用双螺杆挤出机,通过熔融共混法制备了氟橡胶(FKM)/环氧丙烯酸酯橡胶(EACM)共混物.用透射电镜和动态机械热分析仪研究了FKM/EACM共混物的形态、热力学性能和动态机械性能,探讨了共混比对其力学性能的影响.透射电镜研究结果显示,FKM/EACM共混物在共混比范围内呈现出完美的两相连续结构形态,共混体系的相畴尺寸随着EACM用量的不同而改变,当FKM/EACM(质量比)为80/20时,EACM在FKM的基质中形成最完善的网络结构;同时两相产生了协同效应,FKM/EACM共混物的拉伸强度和撕裂强度达到最大值.