不同结构聚合物核壳粒子对环氧树脂的增韧改性

传统环氧树脂的增韧改性方法往往达不到理想的效果。核壳粒子与环氧树脂混合,能减小内应力,获得显著的增韧效果,且不改变热变形温度。文中采用微皂核壳乳液的聚合方法合成了不同的核壳粒子,并对这些核壳粒子增韧环氧树脂体系的力学性能进行试验研究、理论分析和数值计算。用力学强度、动态力学分析等表征手段对核壳粒子的结构和改性环氧树脂体系的增韧机理进行了探讨。结果发现,改善核、壳之间或者核壳粒子壳层同环氧树脂之间的相容性和界面粘合力,核层能更好地将能量充分耗散,改性体系的冲击强度得以进一步提高。

Toughening Modification of Epoxy Resin with Different Core-Shell Particles

The traditional toughening modification of epoxy resin often can’t attain ideal effect.After blended with epoxy resin,the core-shell particles can reduce the internal stress and attain significant toughening effect.Meantime,they don’t change the thermal deformation temperature.In this paper,lots of core-shell particles were prepared by the soap-free core-shell emulsion polymerization method.The properties of epoxy resin modified by these core-shell particles were analyzed.The mechanical strength and dynamic mechanical analysis were used to analyze the structure of core-shell particles and the toughening mechanism of modified epoxy resin.The results showed that improving the compatibility would make the core part dissipate the energy of external force better.So the impact strength increases further.