文献类型：期刊文献

英文题名：Miscibility and phase separation of epoxy/rubber blends

作者：Xu, Shi-Ai[1]

机构：[1] Department of Polymer Engineering and Science, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, China

年份：2017

起止页码：69

外文期刊名：Handbook of Epoxy Blends

收录：EI(收录号：20194507659827)

语种：英文

外文关键词：Curing - Morphology - Phase separation - Liquids - Oligomers - Precipitation (chemical) - High resolution transmission electron microscopy - Rubber - Temperature - Solubility

摘要：The incorporation of functionalized liquid rubbers is one of the most successful methods to toughen epoxies. These rubbers are initially miscible with epoxy oligomers at a given temperature, however, the reaction-induced phase separation occurs because of the increment in the molecular weight of the epoxy matrix as the curing reaction proceeds, thereby resulting in the precipitation of rubber as a dispersed phase. The properties of the resultant epoxy/rubber blends depend largely on their final morphologies, which in turn are determined by the phase separation of the epoxy/rubber blends in the curing process. In this chapter, we first introduce the thermodynamics of phase separation based on the Flory-Huggins solution theory and then discuss the miscibility of epoxy oligomers with liquid rubbers and some factors affecting the phase separation of epoxy/ rubber blends, such as the structural properties of rubber, curing agent, and curing procedure. We also discuss the techniques used to study phase separation. Finally, some critical comments and conclusions are given. ? Springer International Publishing AG 2017. All rights reserved.