液态聚硫橡胶改性苯并噁嗪树脂的研究

Study on Benzoxazine Resin Modified by Liquid Polysulfide Rubber

为了提高苯并噁嗪树脂的性能,使用液态聚硫橡胶对苯并噁嗪树脂进行了改性研究。实验将不同配比的聚硫橡胶与苯并噁嗪树脂进行共混并固化,利用傅立叶红外光谱(FTIR)、差示扫描量热法(DSC)、动态热机械分析仪(DMTA)分析了共混体系的结构、固化行为和玻璃化转变,测定了共混体系的热失重和冲击强度,分析比较了不同聚硫橡胶含量共混体系的结构、热性能和力学性能。结果表明改性苯并噁嗪树脂的热性能和力学性能均得到不同程度的改善。得出如下结论:使用液态聚硫橡胶改性苯并噁嗪树脂时,当聚硫橡胶加入量为5份(苯并噁嗪树脂为100质量份)时,得到的改性树脂和纯噁嗪树脂相比,韧性和热稳定性有显著提高,玻璃化转变温度也略有提高,复合材料的综合性能最好。

In order to improve the properties of benzoxazine resin made from allylamine, bisphenol A and formaldehyde, this resin modified by liquid polysulfide rubber was studied. Different propertions of liquid polysulfide robber and benzoxazine resin were blended and cured during the experiments. The structure, curing behavior, thermal property, and mechanical properties of the modified resin and the effect of different contents of liquid polysulfide rubber on the properties of cured benzoxazine resins were characterized by DSC, FTIR, DMTA, TGA, and impact strength methods. The results show that the mechanical properties and thermal property of the modified resin have been improved to some extend via blending the liquid polysulfide rubber. The following conclusions can be drawn according to the experiments： the optimal ratio of benzoxazine to liquid polysulfide rubber is that benzoxazine resin is 100 portions （mass） and liquid pelysulfide rubber is 5 portions. Under that condition, the toughness and thermal stability of the modified resin are both improve compared with pure resin, and the glass transition temperature of the modified resin rises as well, the comprehensive properties of the composites are the best.