柔性侧链改性环氧树脂的低温增韧研究  

Research on Low Temperature Properties and Toughness of Epoxy Resins Modified with Flexible Side Chain

作　　者：尚呈元[1] 王翔[1] 王钧[1] 杨小利[1] 蔡浩鹏[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《武汉理工大学学报》2009年第19期41-44,共4页Journal of Wuhan University of Technology

基　　金：湖北省自然科学基金(2006ABA321)

摘　　要：采用端异氰酸基聚醚(ITPs)与环氧树脂反应,合成了含有柔性侧链的改性环氧树脂,研究了不同含量ITPs增韧环氧树脂在室温和低温(-60℃)下的冲击韧性和断裂韧性,探讨了增韧对室温和低温力学性能的影响,分析了其低温动态热机械(DMA)曲线并用扫描电镜(SEM)对断口形貌进行了观察。结果表明:低温下,改性环氧树脂在ITPs含量为10%时冲击韧性最好,为18.72 kJ/m2,比纯环氧树脂增加了51.9%,较室温下增韧提高的34.1%效果更为显著,而且弯曲强度和拉伸强度基本保持不变。A novel epoxy resin with flexible side chain was synthesized through the prereactivity of isocyanate-terminated polyethers and E-44, the impact strength and fracture toughness of toughed epoxy with different contents of ITPs were tested and its other mechanical properties were also discussed meanwhile both at room temperature and low temperature, eventually the DMA curves and fracture surface microstructure were analysed. The results show that the toughening epoxy using 10 % ITPs, it can reach the maximam inpact strength 18.72 kJ/m2 at low temperature, increasing 51.9% than the neat epoxy, which suggests a better efficiency comparing with the corresponding parts 34.1% at room temperature , moreover its flexible strength and tensile strength are kept at the same time in comparison with the unmodified.

关 键 词：端异氰酸基聚醚 环氧树脂 低温韧性 动态热机械分析 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]