苯并噁嗪/含磷环氧/含氮酚醛共混体系结构与性能的研究

针对双酚A型苯并噁嗪无法满足较高阻燃要求的缺陷,在双酚A型苯并噁嗪中引入含磷环氧、含氮酚醛,制备了三元共混浇铸体,通过测定凝胶化时间、差示扫描量热仪(DSC)、动态热机械分析(DMA)、热失重分析(TGA)、垂直燃烧、锥形量热等测试手段研究了共混体系固化反应及结构与性能间的关系。研究表明:在共混体系中,随着环氧树脂含量的增加,固化产物的初始储能模量和玻璃化转变温度均减小,同时还有效地发挥了固相、气相阻燃的作用;含氮酚醛的引入,除有效催化固化反应和降低固化反应温度外,还发挥了气相阻燃的作用。含磷环氧和含氮酚醛均能有效提高热稳定性和阻燃性能;含氮酚醛中的氮源比苯并噁嗪中的氮源对阻燃、提高热稳定性等性能所发挥的作用更明显。

Study on Structure and Properties of Benzoxazine/P-epoxy/N-phenolic Blending System

In order to make bisphenol-A benzoxazine to meet the higher flame requirement,the phosphorus-containing epoxy and nitrogen-containing phenolic were introduced into the bisphenol-A benzoxazine resin and prepared the ternary blending castings.The curing reaction,the relationship between structure and properties were studied by means of gel time,DSC,DMA,TGA,vertical flame and cone calorimeter test.The results showed that the initial storage modulus and Tg for the blends decreased with the amount of epoxy resin added,also the phosphorus-containing epoxy effectively played the solid and gas phase flame effect;the curing temperature and curing time were effectively reduced with the introduction of phenolic resin,also it effectively played the role of gas flame retardancy.The phosphorus-containing epoxy and nitrogen-containing phenolic both effectively improved the thermal stability and flame retardancy;compared with the nitrogen from benzoxazine,the nitrogen from nitrogen-containing phenolic played a more important role in improving thermal stability and flame retardancy.