Non-isocyanate polyurethane (NIPU) has received wide attention as a material prepared from renewable resources. Nevertheless, due to its poor mechanical properties, NIPU is difficult to replace conventional polyurethane to achieve large-scale production and practical applications. Hence, using rosin derivatives as raw materials, biogenic cyclic carbonic acid esters were synthesized by carbon dioxide (CO) coupling reaction, and then cured with polyethylenimine (PEI) to form a new renewable NIPU thermosetting network without catalysts. The introduction of a rosin rigid structure and the formation of a hyperbranched structure make the obtained NIPU have excellent tensile strength (up to 40.50 MPa). Meanwhile, the hydrogenated phenanthrene ring structure of rosin restricts the movement of the NIPU chain, which leads to good thermal stability. Taking advantage of the transesterification of carbamates, the resultant NIPU exhibited self-healing, recyclability (recovery efficiency reached 89.50%), and shape memory. In addition, abundant polar groups endow NIPU with good adhesion strength. The innovative bio-based NIPU materials that are suggested in this work exhibit a variety of benefits, such as low curing temperature, outstanding mechanical properties, environment friendliness, and thermal stability, and have various applications in furniture and printing, adhesives, packaging materials, and other industries.

中文翻译：

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一种新型松香基非异氰酸酯聚氨酯，具有高强度、自修复和可回收特性，适用于木材粘合剂

非异氰酸酯聚氨酯（NIPU）作为一种由可再生资源制备的材料受到了广泛的关注。然而，由于NIPU的力学性能较差，很难取代传统聚氨酯实现规模化生产和实际应用。因此，以松香衍生物为原料，通过二氧化碳（CO）偶联反应合成生物环状碳酸酯，然后与聚乙烯亚胺（PEI）固化形成新型可再生NIPU热固性网络，无需催化剂。松香刚性结构的引入以及超支化结构的形成使得所得NIPU具有优异的拉伸强度（高达40.50 MPa）。同时，松香的氢化菲环结构限制了NIPU链的运动，从而具有良好的热稳定性。利用氨基甲酸酯的酯交换反应，所得NIPU具有自修复性、可回收性（回收效率达到89.50%）和形状记忆性。此外，丰富的极性基团赋予NIPU良好的粘合强度。这项工作中提出的创新生物基NIPU材料具有多种优点，例如低固化温度、出色的机械性能、环境友好性和热稳定性，并且在家具和印刷、粘合剂、包装材料、和其他行业。