动态固化聚丙烯/环氧树脂共混物的研究

STUDIES OF DYNAMICALLY CURED PP/EPOXY BLENDS

将动态硫化技术应用于热塑性树脂 热固性树脂体系 ,制备了动态固化聚丙烯 (PP) 环氧树脂共混物 .研究了动态固化PP 环氧树脂共混物中两组分的相容性、力学性能、热性能和动态力学性能 .实验结果表明 ,马来酸酐接枝的聚丙烯 (PP g MAH)作为PP和环氧树脂体系的增容剂 ,使分散相环氧树脂颗粒变细 ,增加了两组分的界面作用力 ,改善了共混物的力学性能 .与PP相比 ,动态固化PP 环氧树脂共混物具有较高的强度和模量 ,含 5 %环氧树脂的共混物拉伸强度和弯曲模量分别提高了 30 %和 5 0 % ,冲击强度增加了 15 % ,但断裂伸长率却明显降低 .继续增加环氧树脂的含量 ,共混物的拉伸强度和弯曲模量增加缓慢 ,冲击强度无明显变化 ,断裂伸长率进一步降低 .动态力学性能分析 (DMTA)表明动态固化PP 环氧树脂共混物是两相结构 ,具有较高的储能模量 (E′)

Dynamical vulcanization process was successfully applied to the PP/epoxy blends. The compatibility of two components, dynamical cure of the epoxy resin and mechanical properties of the blends were studied. Since the epoxy resin and PP are immiscible, maleic anhydride-grafted polypropylene (PP-g-MAH) was used as a compatibilizer. The dynamically cured PP/epoxy blends with the structure of epoxy resin particles finely dispersed in the PP matrix were obtained. The tensile strength and flexural modulus of the dynamically cured PP/epoxy blend containing 5 % epoxy resin increase by 30 % and 50 %, the impact strength increases by 15 % compared to PP, but the elongation at break decreases dramatically. With further increasing the epoxy resin content, the flexural modulus and tensile strength increase slowly and the impact strength varies slightly, while the elongation at break decreases rapidly. Dynamic mechanical thermal analysis (DMTA) shows that the dynamically cured PP/epoxy blends have higher storage modulus (E') compared to PP.