材料期刊网

首次将苯并噁嗪引入模塑料配方中,制备了以苯并噁嗪/环氧树脂/酚醛树脂三元体系为主体树脂的新型模塑料样品.性能研究结果表明,加入苯并噁嗪后,模塑料的操作性没有受到影响;与环氧-酚醛模塑料相比,热机械分析测得的苯并噁嗪/环氧/酚醛模塑料样品的Tg提高了约20 ℃;填料含量同为78%时,苯并噁嗪/环氧树脂/酚醛树脂模塑料的吸水率下降了47%;在更少阻燃剂添加的条件下,苯并噁嗪/环氧/酚醛模塑料同样达到了UL94 V-0级别的耐燃性;环氧-酚醛模塑料封装的TO247器件只能通过最高-50/200 ℃,1 000次的温度循环测试,而苯并噁嗪/环氧树脂/酚醛树脂模塑料封装的TO247器件通过了-50/225 ℃,1 000次的温度循环测试.

Benzoxazine/epoxy/phenolic resin based molding compounds were prepared by introducing benzoxazine into molding compound formula and their thermal stability was studied.The property test results revealed that there was no working ability issue in the application of benzoxazine/epoxy/phenolic molding compound.Comparing with epoxy/phenolic molding compound, Tg of benzoxazine/epoxy/phenolic molding compound increased by 20 ℃ and the water absorption decreased by 47% with a filler ratio of 78%.With lower loading of flame retardant, the flammability of benzoxazine/epoxy/phenolic molding compound was at the same level as epoxy/phenolic molding compound.The performance of epoxy/phenol molding compound deteriorated during storage at 225 ℃ for 500 h, including flexural strength, adhesion, weight loss and Tg, while the properties of benzoxazine/epoxy/phenolic molding compound were much more stable.TO247 units molded with epoxy/phenolic molding compound were able to pass thermal cycle test (-50/200 ℃, 1 000 cycles) without delamination, but TO247 units molded with benzoxazine/epoxy/phenolic molding compound passed thermal cycle test (-50/225 ℃, 1 000 cycles).