比较了3种不同的液体橡胶增韧环氧树脂复合材料的力学性能,用电镜观察了复合材料的形态结构以及冲击断面的形貌,并据此提出了增韧机理.结果表明,随着橡胶含量的增加,复合材料的拉伸强度不断降低,而冲击强度呈现出先增加后降低的趋势;液体橡胶中丙烯腈的含量越高,对环氧树脂的增韧效果越好.而且,丙烯腈含量不同的橡胶,其增韧机理也明显不同.此外,将橡胶粒子的尺寸与基体交联网络的网格尺寸相关联,讨论了不同尺寸的橡胶粒子对交联网络的影响,从而解释了橡胶粒子尺寸对基体性能的影响.
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