A new high-efficiency reaction system composed of aqueous ethanol-alkali solution is developed for fast and mild hydrolysis of thermosetting unsaturated polyester resins (TUPRs) into porous functional materials. Different from high-boiling alcohols in previous reports, ethanol can produce pores in the resins due to its low boiling point and thus significantly speeds up the hydrolysis of the resins. In addition, ethanol improves the surface wettability between resin and reaction reagents. It ionizes out strong nucleophile EtO^– to react with carbonyl groups followed by OH^– substitution in alkaline aqueous solution. The obtained gel products are of considerable hydrophilic groups and can reach a yield of 80% under normal pressure at 80 °C for only 30 min. More importantly, the reaction solution can be easily recycled and reused for hydrolysis of the resins while maintaining catalytic performance. This work provides a green, sustainable, and facile reaction system for recycling of TUPRs into high value-added products.

中文翻译：

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使用低沸点水性溶剂将热固性聚酯树脂高效水解为多孔功能材料

开发了一种由乙醇-碱水溶液组成的新型高效反应系统，可将热固性不饱和聚酯树脂（TUPRs）快速温和水解为多孔功能材料。与以前的报道中的高沸点醇不同，乙醇由于其低沸点而可在树脂中产生孔洞，从而显着加快了树脂的水解速度。另外，乙醇改善了树脂和反应试剂之间的表面润湿性。它离子化强亲核试剂EtO ^–与羰基反应，然后与OH ^–反应在碱性水溶液中取代。所获得的凝胶产物具有相当大的亲水基团，并且在常压下于80°C下仅30分钟即可达到80％的产率。更重要的是，反应溶液可以容易地再循环并再用于树脂的水解，同时保持催化性能。这项工作为将TUPR回收成高附加值的产品提供了一个绿色，可持续和便捷的反应系统。