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为研究聚醚砜(PES)增韧双马来酰亚胺(BMI)与环氧树脂(EP)体系的微观结构与性能,采用原位聚合法制得PES/BMI-EP复合材料。通过FTIR和SEM分析可知PES未与BMI-EP树脂发生化学反应,而是与BMIEP分子间存在强烈的相互作用,并以两相结构存在,是多相复合材料。在PES/BMI-EP复合材料中,PES为分散相,相与相之间界面模糊,其断面裂纹不光滑方向发生改变,为典型的韧性断裂形貌;能谱测试结果证明PES与基体间存在相互渗透现象,PES均匀的分散于基体树脂中。力学测试分析结果显示:当PES含量为4wt%时,PES在基体树脂中分散性较好,其弯曲强度与冲击强度达到最高,为144.9MPa和19.7kJ/m2,比BMI-EP基体树脂分别提高41.2%和90%;热失重测试结果显示,适量的PES能提高PES/BMI-EP复合材料的分解温度,过量添加不利于材料分解温度的升高。
In order to study the microstructure and properties of polyepsulfone (PES) toughening bismaleimide (BMI) and epoxy resin (EP) systems, PES / BMI-EP composites were prepared by in-situ polymerization. FTIR and SEM analysis showed that PES did not chemically react with BMI-EP resin, but had strong interaction with BMIEP molecules and existed in two-phase structure. It was a multiphase composite material. In PES / BMI-EP composites, PES is dispersed phase, the interface between phase and phase is fuzzy, and the fracture of the PES / BMI-EP composites changes in a non-smooth direction, which is a typical ductile fracture morphology. Mutual penetration phenomenon, PES dispersed in the matrix resin evenly. Mechanical test results show that PES has good dispersibility in matrix resin with PES content of 4wt%, and flexural strength and impact strength are the highest, which are 144.9MPa and 19.7kJ / m2, respectively, which are higher than that of BMI-EP matrix resin 41.2% and 90% respectively. The results of TG test showed that the proper amount of PES could improve the decomposition temperature of PES / BMI-EP composites, which was not conducive to the increase of decomposition temperature.