本文笔者应用扫描电子显微镜(SEM)对双酚A型环氧树脂与4,4′-二氨基二苯甲烷(DDM)固化体系,在水和丙酮溶胀前后链球的形态变化进行了研究。研究表明:水的溶胀仅发生在链球间的低交联度区域,溶胀后链球的尺寸基本不变,而丙酮的溶胀尚可进入链球的边界层,溶胀后链球的尺寸减小。由此说明固化环氧树脂具有不均匀结构特征。 In this paper, the morphological changes of bisphenol A epoxy resin and 4,4’-diaminodiphenylmethane (DDM) curing system were investigated by scanning electron microscopy (SEM) before and after water and acetone swelling. The results show that the swelling of water occurs only in the low cross-linking area between chains, and the size of the chain does not change after swelling. However, the swelling of acetone can still enter the boundary layer of the chain, and the size of the chain decreases after swelling. This shows that the cured epoxy resin has a non-uniform structure.