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为了制得耐热性能较好、可以固化“零”收缩的聚苯并噁嗪,采用差示扫描量热(DSC)法和热失重(TGA)法对不同固化条件下制取的一系列聚苯并噁嗪的固化行为和耐热性能进行了分析,同时对固化温度和固化时间与聚苯并噁嗪体积的变化关系进行了研究。结果表明:聚苯并噁嗪的耐热性随固化温度的升高而上升,延长固化时间试样的耐热性略有提高;在200℃/2h固化条件下制取的聚苯并噁嗪,其分解温度为410℃,500℃时的残炭率为51.8%,700℃时的残炭率为40.8%;固化所得聚苯并噁嗪的体积随固化温度的升高而减小,随固化时间的延长而增大;通过控制固化条件,聚苯并噁嗪可以实现固化“零”收缩。
In order to obtain the polybenzoxazine with better heat resistance and shrinkage of “zero” shrinkage, DSC-DSC and TGA were used to investigate the effect of different curing conditions Series of polybenzoxazine curing behavior and heat resistance were analyzed, while the curing temperature and curing time and polybenzoxazine volume changes were studied. The results show that the heat resistance of polybenzoxazine increases with the increase of curing temperature, and the heat resistance of the sample increases slightly during the curing time. The polybenzoxazine prepared under the condition of 200 ℃ / 2h curing, , The decomposition temperature is 410 ℃, the carbon residue rate at 500 ℃ is 51.8% and the carbon residue rate at 700 ℃ is 40.8%. The volume of the polybenzoxazine cured decreases with the curing temperature, Curing time increases and increases; by controlling the curing conditions, polybenzoxazine can achieve curing “zero ” contraction.