环氧树脂／聚氧乙烯固化共混体系的动态力学性能

Dynamic Mechanical Properties of Epoxy Resins/Poly(Ethylene Oxide) Blends Cured with Phthalic Anhydride and Aromatic Amine

研究了环氧树脂／聚氧乙烯分别在邻苯二甲酸酐和４，４＇－二氨基二苯甲烷为固化剂条件下的固化剂用量、类型和固化共混物的动态力学性能。结果表明所有共混物在熔融态和非晶态都是相容的，即在高温区都存在一个α松驰，玻璃化转变温度随共混组成有规律地变化。不同固化剂的固化物交联网的化学结构不同，因而低温松弛──β松弛机制也不同，同时其对体系的交联密度、共混组成的依赖性也不同。

Dynamic mechanical properties fo epoxy resins(EP)/poly(ethylene oxide) blends cured with phthalic anhydride(PA) and 4,4'-diaminodiphenylmethane(DDM)were studied. The experimental results indicated that all the blends, with various blend composition and content of curing agents, are miscible at amorphous state,i.e. all the dynamic mechanical spectra showed one single T_g, regularly between two T_gs of constituents.The mechanism of the low temperature relaxation(β relaxation)is different because there are different crosslinking networks of chemical structure between the aromatic amine-cured and the phthalic anhydride-cured products, Therefore, the reliance on the crosslinking density and blend composition is also different.