【作者】 刘欣； 顾宜；

【Author】 Liu Xin, Gu Yi(State Key Laboratory of Polymer Materials Engineering, Department of Polymer Material Science and Engineering, Sichuan University, Chengdu 610065, P.R.China)

【机构】 高分子材料工程国家重点实验室四川大学高分子材料科学与工程系；

【摘要】 本文采用比重瓶法和膨胀计法,分别从体积收缩率、线性收缩率、恒温固化收缩率、密度-固化时间曲线几方面研究了不同酚核结构苯并噁嗪热聚合体系及双酚A型苯并噁嗪催化聚合体系的体积膨胀效应;同时考察了不同体系固化物的力学性能。结果表明,不同结构及不同催化体系的苯并噁嗪均呈现出宏观体积膨胀效应,但在恒温固化过程中却均呈现体积收缩,且这种体积变化的大小与苯并噁嗪的分子结构、聚合反应程度和交联密度相关;不同催化剂对双酚A型苯并噁嗪体积膨胀效应以及固化物的力学性能有显著影响。更多还原

【Abstract】 In this paper, the volumetric expansion of three benzoxazines based on bisphenol A, p-cresol and 2,4-dichlorophenol respectively as well as bisphenol A benzoxazines with different catalysts are investigated. By means of gravitometoric and dilatometric methods, the studies on apparent volumetric shrinkage, density vs. cure time plots, and isothermal cure shrinkage have been profound. The results show that all benzoxazine systems exhibit volumetric expansion upon curing. In addition, the effects of different catalysts on the mechanical properties including flexural strength, impact strength and tensile shear strength of these benzoxazine materials are discussed.更多还原