核壳粒子增韧改性液态成型双马树脂性能及其机理  

Properties and mechanism of core-shell particle toughening liquid molding bismaleimide resin

作　　者：邹齐 王乐天 李军 张代军 陈祥宝 刘燕峰 ZOU Qi;WANG Letian;LI Jun;ZHANG Daijun;CHEN Xiangbao;LIU Yanfeng(Soft Materials Technology Center,AECC Beijing Institute of Aeronautical Materials,Beijing 100079,China;National Key Laboratory of Advanced Composites,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院软材料技术研究中心,北京100079 [2]中国航发北京航空材料研究院先进复合材料国防科技重点实验室,北京100095

出　　处：《科技导报》2023年第9期43-50,共8页Science & Technology Review

基　　金：国家重点研发计划项目(2018YFA0703300);国家科技重大专项(2017-IV-0007-0044)。

摘　　要：传统的液态成型双马来酰亚胺树脂(BMI)较低的韧性阻碍了其在航空航天领域的应用。通过在液态成型双马树脂网络中引入核壳粒子,利用核壳粒子具备独特的双层结构增韧改性双马树脂。采用扫描电子显微镜(SEM)对不同含量核壳粒子改性液态成型双马树脂体系断面形貌进行研究,SEM结果表明,改性的液态成型双马树脂固化物断裂表面的裂纹扩展明显受阻,显示韧性断裂形貌。研究了不同含量核壳粒子对液态成型双马树脂体系性能的影响,优选出最佳的核壳粒子含量。研究表明,改性固化物表现出优异的机械性能:拉伸强度108.8 MPa,提高了13.1%;断裂伸长率3.12%,提高了16.8%;弯曲强度190 MPa,提高了12.4%;KIC达到2.83 MPa/m^(1/2),提高了20.9%;GIc达到1619 J/m^(2),提高了54.6%;并且保持改性前树脂热性能及热失重性能,玻璃化转变温度Tg为292.3℃,5%热失重温度为401.0℃。The poor toughness of liquid molding bismaleimide resin(BMI)had hampered its application in the aeronautics and space field before core-shell particles with double-layer structure were introduced to toughen BMI.The fracture morphology of BMI was studied by scanning electron microscopy(SEM)showing that the fracture surfaces of the toughened BMI were ductile fracture morphology owing to crack propagation blocked.In addition,the content of core-shell particles was adjusted to perfectly improve the comprehensive performance of BMI.Compared to the neat BMI,toughened BMI exhibits excellent mechanical performance with a tensile strength of 108.8 MPa,increased by 13.1%,an elongation at break of 3.12%,increased by 16.8%,a flexural strength of 190 MPa,increased by 12.4%,a KIc of 2.83 MPa/m^(1/2),increased by 20.9%,and a GIc of 1619 J/m^(2),increased by 54.6%.Moreover,the toughened BMI can maintain heat resistance and thermal stability,with glass transition temperature of 292.3℃and 5%weight loss temperature of 401.0℃.

关 键 词：双马树脂 液态成型 核壳粒子 增韧 

分 类 号：TB332[一般工业技术—材料科学与工程] TQ322[化学工程—合成树脂塑料工业]