Yang Huili, Du Yanqin, Zhang Guangshe, Han Ling, Zhang Longgui, Xu Riwei
Key Laboratory of Carbon Fiber and Functional Polymers, Beijing University of Chemical Technology, Ministry of Education, Beijing 100029, China.
SINOPEC (Beijing) Research Institute of Chemical Industry Co., Ltd., Beijing 100013, China.
Molecules. 2023 Oct 23;28(20):7234. doi: 10.3390/molecules28207234.
In this paper, the bio-based raw material erythritol was used to introduce an acetal structure into the benzoxazine resins. The benzoxazine-based resins containing an erythritol acetal structure could be degraded in an acidic solution and were environmentally friendly thermosetting resins. Compounds and resins were characterized by H nuclear magnetic resonance (H NMR) and Fourier-transform infrared (FT-IR) analyses, and melting points were studied by a differential scanning calorimeter (DSC); the molecular weight was analyzed by gel permeation chromatography (GPC). The dynamic mechanical properties and thermal stability of polybenzoxazine resins were studied by dynamic mechanical thermal analysis (DMTA) and a thermogravimetric analyzer (TGA), respectively. The thermal aging, wet-heat resistance, and degradation properties of polybenzoxazine resins were tested. The results showed that the polybenzoxazine resins synthesized in this paper had good thermal-oxidative aging, and wet-heat resistance and could be completely degraded in an acidic solution (55 °C DMF: water: 1 mol/L hydrochloric acid solution = 5:2:4 (//)).
在本文中，使用生物基原料赤藓糖醇将缩醛结构引入苯并恶嗪树脂中。含有赤藓糖醇缩醛结构的苯并恶嗪基树脂可在酸性溶液中降解，是环境友好型热固性树脂。通过氢核磁共振（H NMR）和傅里叶变换红外（FT-IR）分析对化合物和树脂进行了表征，用差示扫描量热仪（DSC）研究了熔点；通过凝胶渗透色谱法（GPC）分析了分子量。分别用动态力学热分析（DMTA）和热重分析仪（TGA）研究了聚苯并恶嗪树脂的动态力学性能和热稳定性。测试了聚苯并恶嗪树脂的热老化、湿热抗性和降解性能。结果表明，本文合成的聚苯并恶嗪树脂具有良好的热氧化老化性能和湿热抗性，并且可以在酸性溶液（55℃，N,N-二甲基甲酰胺：水：1mol/L盐酸溶液=5:2:4（//））中完全降解。
