聚丙烯酸酯液体橡胶增韧环氧树脂体系研究

采用溶液聚合法合成了以丙烯酸丁酯、丙烯酸乙酯、丙烯酸缩水甘油酯为主链的液体橡胶,将其用于增韧改性环氧树脂/间苯二甲胺(EP 828/mXDA)体系,研究了聚丙烯酸酯液体橡胶用量对共混体系的微观形态、力学性能和玻璃化温度的影响。电镜观察显示液体橡胶改性EP828/mXDA的共混物呈海岛结构,连续相为环氧树脂,分散相为液体橡胶。随着丙烯酸酯液体橡胶用量增加,海岛相区的粒径和数量均呈增长趋势。当丙烯酸酯液体橡胶质量分数为15%时,共混物中海岛相区的尺寸为1μm左右,共混体系的冲击强度增加151.8%,玻璃化温度下降11.3℃。以丙烯酸液体橡胶改性EP828/mXDA环氧树脂体系,可以较大程度提高其韧性,同时其耐热性基本保持不变。

Studies on EP828/mXDA system toughened with poly-acrylate liquid rubber

Poly-acrylate liquid rubber was synthesized via solution polymerization with butyl acrylate,ethyl acrylate and glycidyl methacrylate,and was used to enhance the toughness of epoxy resin system of EP828/mXDA.The influence of poly-acrylate liquid rubber content on morphology,mechanics properties and glass transition temperature of the modification system was discussed in this paper.The SEM photo showed in the blend of EP828/mXDA system toughened with poly-acrylate liquid rubber the sea island structure was formed and in which epoxy component existed as the continuous phase and liquid rubber component existed as the disperse phase.The size and number of rubber particals were increased with the poly-acrylate liquid rubber content increased.The impact strength of the modification system was increased by 151.8% and the glass transition temperature dropped by 11.3 ℃,when 15%(wt) liquid rubber was incorporated and the size of sea island phase region was about 1μm.In a word,the incorporation of the synthesized liquid rubber could greatly improves the toughness of EP828/mXDA system,and the system heat-resistant property decreased a little at the same time.