不同纳米核壳粒子增韧环氧树脂体系的性能及机理研究

STUDY ON THE PROPERTIES AND MECHANISM OF TOUGHENED EPOXY RESIN SYSTEM WITH DIFFERENT CORE SHELL PARTICLES

纳米核壳粒子通常为玻璃化转变温度较高的热塑性聚合物包裹橡胶内核结构,其优点在于在树脂固化前后结构不发生明显变化,不会因为固化过程中橡胶相分离不完全影响树脂性能。但是纳米粒子的均匀分散一直是环氧添加剂使用过程中的难题。采用三种不同组成、不同粒径的核壳粒子增韧环氧树脂,采用DDS固化的双酚F树脂基体,制备了一系列耐热性优良的环氧树脂体系。研究通过预制母液分散二步法分散纳米颗粒,解决纳米粒子的均匀分散问题,得到均一增韧体系。增韧后的三种体系均对树脂韧性有很大的提升作用。经力学性能、热力学性能、流变学性能和微观结构性能等测试和分析,优选出最佳的纳米多尺度核壳粒子增韧环氧体系,并阐明了其增韧机理。

Core-shell particles are usually consist of a high glass transition temperature ＂shell＂ and a rubber ＂core＂. The advantage is that the core-shell structure does not change during the process of resin curing. But the uniform dispersion of nanoparticles has always been a difficult problem in the use of epoxy additives. In this paper,we adopt three different kinds of core-shell particles with different composition and sizes to toughen bisphenol F epoxy resin matrix to prepare a series of epoxy resin system with excellent heat resistance. The dispersion of nano-particles by two steps pre-dispersing is studied to obtain a uniform system. The toughening systems have great improvement on resin toughness. The mechanical properties,thermo-properties,rheological properties and microstructure properties has been tested and analyzed. A multi-scale core-shell nanoparticles toughening epoxy system was prepared and its toughening mechanism is illustrated.