Ntrivala Maria Angeliki G, Balla Evangelia D, Klonos Panagiotis A, Kyritsis Apostolos, Bikiaris Dimitrios N
Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece.
Department of Physics, National Technical University of Athens, Zografou Campus, GR-157 80 Athens, Greece.
Polymers (Basel). 2025 Mar 10;17(6):728. doi: 10.3390/polym17060728.
The increasing quest for greener and more sustainable polymeric materials has gained interest in the past few decades. Non-isocyanate polyurethanes (NIPUs) have attracted attention considering that they are produced through less toxic methods compared to the conventional polyurethanes (PUs) obtained from petroleum resources and toxic isocyanates. In this context, adipic acid, glycerol carbonate, 1,2-ethylenediamine, and 1,6-hexamethylenediamine, were used to synthesize NIPU_ethyl and NIPU_hexa, respectively. The obtained NIPUs were characterized using nuclear magnetic resonance spectroscopy (H-NMR spectra) and Fourier-transform infrared spectroscopy (FTIR) analysis, which verified the structures of the intermediate and final products. Calorimetric and dielectric studies provided direct and indirect support for the facilitated thermal stability of NIPU_ethyl and NIPU_hexa. Compared to the intermediate product, the NIPUs exhibit elevated glass transition temperatures, suggesting the formation of more rigid structures. The NIPUs were also tested in terms of swelling properties, and the results indicated that NIPU_hexa absorbs and withholds increased amounts of water for longer time periods compared to NIPU_ethyl, and their hydrolysis and enzymatic hydrolysis confirmed that NIPU_hexa is more stable in aqueous environments than NIPU_ethyl. Therefore, the successful production of adipic-acid-based NIPUs through a novel perspective of the polyaddition path is reported and complemented by the characterization of the obtained materials with several techniques.
在过去几十年里，对更绿色、更可持续的聚合物材料的追求日益增加。非异氰酸酯聚氨酯（NIPUs）受到了关注，因为与从石油资源和有毒异氰酸酯获得的传统聚氨酯（PUs）相比，它们是通过毒性较小的方法生产的。在此背景下，分别使用己二酸、碳酸甘油酯、1,2 - 乙二胺和1,6 - 己二胺来合成NIPU_ethyl和NIPU_hexa。使用核磁共振光谱（H - NMR光谱）和傅里叶变换红外光谱（FTIR）分析对所得的NIPUs进行了表征，这验证了中间产物和最终产物的结构。量热和介电研究为NIPU_ethyl和NIPU_hexa的热稳定性提供了直接和间接的支持。与中间产物相比，NIPUs表现出更高的玻璃化转变温度，表明形成了更刚性的结构。还对NIPUs的溶胀性能进行了测试，结果表明与NIPU_ethyl相比，NIPU_hexa在更长时间内吸收并保留了更多的水分，并且它们的水解和酶促水解证实了NIPU_hexa在水性环境中比NIPU_ethyl更稳定。因此，报道了通过聚加成途径的新视角成功制备了基于己二酸的NIPUs，并通过多种技术对所得材料进行表征加以补充。
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