中温固化热熔胶膜法制备环氧树脂预浸料及其复合材料

摘要

以双酚A型环氧树脂为基体,3,3'-二乙基-4,4'-二氨基二苯甲烷(DEDDM)为固化剂,热塑性树脂为增韧剂,采用中温固化热熔胶膜法制备环氧树脂预浸料,并以玻璃纤维为增强体制备玻璃纤维/环氧树脂复合材料.结果表明,环氧树脂固化物及其复合材料的力学性能和热性能均随增韧剂的加入呈上升趋势.当增韧剂质量分数为20％时,环氧固化物的弯曲和冲击强度分别为122.4MPa和23.8 kJ/m2,较纯环氧树脂分别提高50％和154％;玻璃化转变温度(Tg)从102℃提升到123℃;增韧剂/玻璃纤维/环氧树脂复合材料的弯曲强度和层间剪切强度为636.5 MPa和54.9 MPa,Tg为130℃.扫描电子显微镜(SEM)分析表明,玻璃纤维和环氧树脂具有较好的界面粘接性能.%The epoxy resins prepreg curable at middle temperature via hot melt film method was prepared,herein,the bisphenol A epoxy resin as the polymeric matrix,3,3'-diethyl-4,4'-diaminodiphenylmethane (DEDDM) as a curing agent,the thermoplastic resin as a toughening agent.Furthermore,the corresponding toughening agent/glass fibers/epoxy resins composites were also obtained.The results revealed that the mechanical and thermal properties of the epoxy resins and composites were enhanced by adding the toughening agent.When the toughening agent content was 20 wt％,the flexural and impact strength of the epoxy resins was 122.4 MPa and 23.8 kJ/m2,increased by 50％ and 154％ compared to that of pure epoxy resins,respectively.The glass transition temperature (Tg) was also improved from 102℃ to 123℃.In addition,the flexural and interlaminar shear strength of the toughening agent/glass fibers/epoxy resins composites were enhanced to 636.5 MPa and 54.9 MPa,respectively.The scanning electron microscope (SEM) analyses revealed the good interface bonding properties between glass fibers and epoxy resins.