摘要
采用热熔法制备环氧树脂(EP)/氰酸酯树脂(CE)/酚酞基聚醚酮(PEK-C)半互穿网络聚合物。利用三点弯曲法测定了固化物的力学性能,通过动态力学分析(DMA)研究了固化物玻璃化转变温度(Tg)及储存模量变化规律;用扫描电镜(SEM)对断面进行了观察。结果表明,在Tg和弯曲性能基本保持不变的情况下,PEK-C能有效地改善固化物的韧性。当PEK-C的加入量为15%(质量分数,下同)时,断裂韧性KIC和GIC值可分别提高20%和50%,归功于此时固化物形成双连续相结构。但是随着PEK-C含量的增加,固化物初始分解温度略微下降,这可能与交联密度的少量降低有关。
The polymer with semi-IPN structure was prepared by blending epoxy resin （EP） with phenolphthalein poly （ether ketone） （PEK-C） using cyanate eater resin （CE） as curing agent. The mechanical properties including fracture toughness, flexural module and flexural strength were tested by three-point bending method. The glass transition temperature （Tg） and storage module were tested by dynamic mechanical analysis （DMA）. And the morphology of the fracture surface was observed by scanning electron microscopy （SEM）. The results show that PEK-C can enhance the toughness of the cured resins without sacrificing Tg and the mechanical properties. But the initial decomposition temperature slightly decreases with increasing PEK-C content, probably due to the reduced cross-linking density.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2009年第7期141-143,共3页
Polymer Materials Science & Engineering
基金
辽宁省高等学校优秀人才计划项目(RC05-14)
