Journal of Materials Science ( IF 3.5 ) Pub Date : 2022-01-03 , DOI: 10.1007/s10853-021-06744-x Xinggang Chen 1, 2, 3 , Yanqing Cai 1 , Jun Chen 2 , De Zheng 2 , Xiongwei Qu 3
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To expand the processing window of phthalonitrile resins, a novel self-catalyzed amino-epoxy 4-aminophenoxy phthalonitrile-resorcinol diglycidyl ether phthalonitrile (APRE-PN) resin was prepared via a two-step method of reacting amino and epoxy groups at a low temperature and then reacting nitrile with nitrile groups at a high temperature. The amine-epoxy, epoxy-nitrile, and nitrile-nitrile reactions were confirmed by Fourier-transform infrared spectroscopy and differential scanning calorimetry, and the probable polymerization mechanism was elucidated. The significant decrease in the melting point of the proposed APRE-PN prepolymers dramatically expands the processing window (173 °C) for an entire class of phthalonitrile matrices. The APRE-PN resin exhibits excellent thermal stability and dynamic mechanical properties owing to the presence of triazine, phthalocyanine, and oxazoline structures. The improved preparation method provides a new path for the preparation of phthalonitrile resins with large processing windows and new opportunities for the use of this type of thermosetting matrix in manufacturing various composite materials and prepregs.
Graphical abstract
中文翻译：
大加工窗口自催化氨基环氧邻苯二甲腈树脂的制备
为扩大邻苯二甲腈树脂的加工窗口，通过氨基和环氧基在低温下反应的两步法制备了一种新型自催化氨基-环氧4-氨基苯氧基邻苯二甲腈-间苯二酚二缩水甘油醚邻苯二甲腈（APRE-PN）树脂。然后在高温下使腈与腈基反应。通过傅里叶变换红外光谱和差示扫描量热法证实了胺-环氧树脂、环氧-腈和腈-腈反应，并阐明了可能的聚合机理。所提出的 APRE-PN 预聚物熔点的显着降低极大地扩展了整个邻苯二甲腈基质的加工窗口 (173 °C)。由于三嗪、酞菁和恶唑啉结构的存在，APRE-PN 树脂表现出优异的热稳定性和动态机械性能。改进后的制备方法为制备大加工窗口的邻苯二甲腈树脂提供了一条新途径，也为该类热固性基体在制造各种复合材料和预浸料中的应用提供了新的机会。
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