液体橡胶增韧环氧树脂/咪唑体系的形态与力学性能  

Morphology and Mechanical properties of Cured Epoxy Resin/Imidazole System Toughened by Liquid Rubber

作　　者：张健[1] 韩孝族[1] 

机构地区：[1]中国科学院长春应用化学研究所,长春130022

出　　处：《应用化学》2005年第12期1333-1337,共5页Chinese Journal of Applied Chemistry

摘　　要：研究了液体橡胶增韧环氧树脂/咪唑固化体系,通过扫描电镜和透射电镜对增韧样品微观结构的观察,确认增韧是由于发生了相分离,分散相橡胶颗粒在连续相环氧树脂中形成'海岛结构'.获得最佳增韧效果的橡胶微区尺寸为1～3 μm.当CTBN增韧DGEBA/2,4EM-Z体系时,断裂韧性GIc提高十几倍,冲击强度提高近1倍,拉伸强度提高2～3倍.动态力学性能研究表明,CTBN增韧环氧树脂固化物的玻璃化转变温度降低,与CTBN不完全固化或者溶于树脂相中,形成塑性玻璃化转变有关.The morphology of cured epoxy resin/imidazole system toughened by terminal functional liquid rubber has been investigated via SEM and TEM techniques. The presence of a tow-phase micro-structure was observed in modified cured systems in which the rubber micro-phase distributed in island form in the continuous phase of the epoxy resin network. In fact, only when the domain size of the rubber phase is 1 - 3μm, may the toughening result be optimum. The critical fracture energy release rate （Glc） could be improved more than ten times, and the tensile strength increases by 2- 3 times, and the impact strength nearly doubles, when the DEGBA/imidazole cured system is toughened by CTBN at optimum level. The dynamic mechanical analysis indicated that the glass transformation temperature（Tg） of the cured system toughened by CTBN was reduced, because the CTBN cured imperfectly or dissolved incompletely in the modified cured system and plastisized the matrix.

关 键 词：CTBN HTBN 增韧环氧树脂 形态结构 力学性能 

分 类 号：O631.2[理学—高分子化学]