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以碱为催化剂,通过酚醛树脂与4-硝基邻苯二甲腈之间的亲核取代反应,制备了邻苯二甲腈醚化酚醛树脂(BPN)并采用红外光谱,GPC,流变仪,DSC及TGA对其性能进行了研究。结果表明,BPN树脂加工窗口约为65℃,最小粘度约为300 mPa.s,具有优良的加工性能。BPN固化温度为175～350℃,固化反应峰值温度为290℃,说明该树脂通过酚羟基对邻苯二甲腈基团的催化热聚合反应,实现了含氰基树脂的单组分、较低温度的加成固化。BPN树脂在温和的后固化条件下(250℃/6 h)即可获得优良的热稳定性,其5%失重温度约为420℃,氮气氛围900℃残炭率约为72%。
Using alkali as catalyst, phthalonitrile etherified phenolic resin (BPN) was prepared by nucleophilic substitution reaction between phenolic resin and 4-nitrophthalonitrile. The structure of the polymer was characterized by FTIR, GPC, rheometer DSC, TGA and their properties were studied. The results show that the processing window of BPN resin is about 65 ℃ and the minimum viscosity is about 300 mPa · s, which has excellent processing performance. BPN curing temperature of 175 ~ 350 ℃, curing reaction peak temperature of 290 ℃, indicating that the resin through the phenolic hydroxyl on the phthalonitrile group catalytic thermal polymerization reaction to achieve a one-component cyano-containing resin, lower Addition curing temperature. The BPN resin achieves excellent thermal stability under mild post-cure conditions (250 ° C / 6 h) with a 5% weight loss temperature of about 420 ° C and a carbon content of about 72% at 900 ° C in a nitrogen atmosphere.