Liu Jie, Miao Pengcheng, Leng Xuefei, Che Jian, Wei Zhiyong, Li Yang
State Key Laboratory of Fine Chemicals, Department of Polymer Science and Engineering, Liaoning key Laboratory of Polymer Science and Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China.
Dalian Xinyulong Marine Biological Seed Technology Co., Ltd., Dalian, 116222, China.
Macromol Rapid Commun. 2023 Oct;44(19):e2300263. doi: 10.1002/marc.202300263. Epub 2023 Jul 17.
Non-isocyanate polyurethanes (NIPUs) are widely studied as sustainability potential, because they can be prepared without using toxic isocyanates in the synthesis process. The aminolysis of cyclic carbonate to form NIPUs is a promising route. In this work, a series of NIPUs is prepared from renewable bis(6-membered cyclic carbonates) (iEbcc) and amines. The resulting NIPUs possess excellent mechanical properties and thermal stability. The NIPUs can be remolded via transcarbamoylation reactions, and iEbcc-TAEA-10 (the molar ratio of tris(2-aminoethyl)amine in amines is 10%) still get a recovery ratio of 90% in tensile stress after three cycles of remolding. In addition, the obtained materials can be chemically degraded into bi(1,3-diol) precursors with high purity (>99%) and yield (>90%) through alcoholysis. Meanwhile, the degraded products can be used to regenerate NIPUs with similar structures and properties as the original samples. The synthetic strategy, isocyanate-free and employing isoeugenol and carbon dioxide (CO ) as building blocks, makes this approach an attractive pathway to NIPU networks taking a step toward a circular economy.
非异氰酸酯聚氨酯（NIPUs）因其在合成过程中无需使用有毒异氰酸酯而作为具有可持续发展潜力的材料被广泛研究。环状碳酸酯的氨解反应是制备NIPUs的一条很有前景的途径。在本工作中，一系列NIPUs由可再生的双（六元环状碳酸酯）（iEbcc）和胺类制备而成。所得的NIPUs具有优异的机械性能和热稳定性。这些NIPUs可通过转氨基甲酰化反应进行重塑，且iEbcc-TAEA-10（胺类中三（2-氨基乙基）胺的摩尔比为10%）在经过三次重塑循环后，其拉伸应力的恢复率仍达到90%。此外，通过醇解反应，所制备的材料可被化学降解为高纯度（>99%）和高收率（>90%）的双（1,3-二醇）前体。同时，降解产物可用于再生具有与原始样品相似结构和性能的NIPUs。这种合成策略，即不使用异氰酸酯并采用异丁香酚和二氧化碳（CO₂）作为原料，使该方法成为通往NIPU网络的一条有吸引力的途径，朝着循环经济迈出了一步。
