摘要
通过质子转移聚合,采用双酚A和三羟甲基丙烷三缩水合成了一种芳香族聚醚型超支化环氧(EHBP),将其添加到双酚A缩水甘油醚型环氧(DGEBA)中制备成杂化树脂进行增韧改性。采用酸酐固化后,利用差示扫描量热仪(DSC)和热重分析仪(TGA)对固化树脂的玻璃化转变温度和热稳定性进行了表征,并对其拉伸强度、弯曲强度和冲击强度进行了测试。结果表明向DGEBA中添加EHPE可以在不影响材料热性能和拉伸强度的情况下改善其韧性。在EHBP添加量为15%时,材料的冲击强度由纯DGEBA的19kJ/m2提高到28kJ/m2。扫描电子显微镜对材料冲击断面的形貌的表征表明,EHBP对环氧树脂的增韧机理为原位均相增韧。
An epoxy-terminated aromatic hyperbranched polyether（EHBP）was synthesized through proton transfer polymerization of bisphenol A and 1,1,1-trihydroxymethylpropane triglycidyl ether（TMPGE）. As a toughener,EHBP was added into diglycidyl ether of bisphenol A（EGEBA）in different ratios to form hybrids and cured by anhydride. Thermal and mechanical properties of the cured hybrids were investigated. Results showed that addition of EHBP can improve the tough ness of the cured resins without compromising thermal properties and tensile strength. At a loading of 15%,impact strength was increased to 28kJ/m^2 from 19kJ/m^2 of neat EGEBA. Scanning electron microscope characterization of fracture surfaces confirmed that toughness improvement can be explained by in situ toughening mechanism.
出处
《化工新型材料》
CAS
CSCD
北大核心
2014年第2期116-118,共3页
New Chemical Materials
关键词
环氧
超支化
热性能
力学性能
增韧
epoxy resin, hyperbranch, thermal property, mechanical property, toughening
