Abstract A new type of phthalonitrile-etherified resole resin (PNR) was synthesized from resole resin and 4-nitrophthalonitrile. The differential scanning calorimetry results showed that the curing temperature of PNR is lower than that of phthalonitrile resin. Excellent thermal stability and bonding properties were obtained after curing at 220°C. TGA showed that in air, the temperature of 5% weight loss (T 5%) of the cured PNR was 446°C, approximately 41°C higher than that of resole resin (RS), and the char yield at 800°C increased from 4% for RS to 33% for PNR. The shear strengths of PNR at room temperature and high temperature were increased by 8% and 133%, respectively, over those of RS, and after aging at 350°C for 2 h, these values were increased by 262% and 198%, respectively, over those of RS. Its excellent curing behavior, heat resistance and high bonding strength show that PNR can be used as a high temperature-resistant adhesive. Graphical abstract The introduction of nitrile groups improves the heat resistance of resole resin and also improves the adhesive properties of resole resin at high temperatures and its heat aging.

中文翻译：

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邻苯二甲腈-醚化甲阶酚醛树脂的合成、表征及性能

摘要 以甲阶酚醛树脂和4-硝基邻苯二甲腈为原料合成了一种新型邻苯二甲腈醚化甲阶酚醛树脂(PNR)。差示扫描量热法结果表明，PNR的固化温度低于邻苯二甲腈树脂的固化温度。在 220°C 固化后获得了优异的热稳定性和粘合性能。TGA显示，在空气中，固化PNR的5%失重温度（T 5%）为446°C，比甲阶酚醛树脂（RS）高约41°C，800°C下的焦炭产率增加从 RS 的 4% 到 PNR 的 33%。PNR在室温和高温下的剪切强度比RS分别提高了8%和133%，在350°C老化2小时后，这些值分别提高了262%和198% ，超过那些 RS。其优异的固化性能，耐热性和高粘接强度表明 PNR 可用作耐高温粘合剂。图文摘要腈基的引入提高了甲阶酚醛树脂的耐热性，也提高了甲阶酚醛树脂在高温和热老化下的粘合性能。