以端氨基树枝状大分子PAMAM作为环氧树脂固化剂,通过拉伸试验、冲击试验、DSC、TGA研究了配比和固化温度对PAMAM与环氧树脂E-44的固化物性能的影响.结果表明,最佳固化温度为140℃,但随着固化温度升高,配比的影响表现出不同的规律:80℃固化时,最佳配比为0.47,此时拉伸强度和冲击强度最佳,玻璃化转变温度最高,交联密度最大;而在80℃以上固化时,最佳配比逐渐向低配比方向移动,140℃固化时,最佳配比为0.28,此时拉伸强度和冲击强度最佳,玻璃化转变温度最高,交联密度最大.固化物的密度和体积收缩率都是配比为0.47时最大,而热稳定性都是配比为0.28时最佳.利用滴定法测定了固化物的固化度,结果表明,随着固化温度的升高,低配比体系的固化度迅速提高并接近化学计量点配比体系的固化度.
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