A green route for high-performance bio-based polyurethanes synthesized from modified bio-based isocyanates

IF 5.6 1区农林科学 Q1 AGRICULTURAL ENGINEERING Industrial Crops and Products Pub Date : 2024-09-04 DOI:10.1016/j.indcrop.2024.119542

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Abstract

The need for sustainability and a circular economy leads to the development of innovative greener materials and technologies. This paper is focused on a novel class of bio-based polyurethanes (PUs) synthesized with the use of bio-monomers including bio-based isocyanates. The novelty of this work is related to the usage of bio-based modified isocyanate via a two-step solvent-free synthesis of novel cast bio-based poly(ester-urethanes) and poly(ether-urethanes). The designed and prepared bio-based PUs were analysed in terms of their chemical structure, thermal stability, mechanical and thermomechanical properties. Fourier transform infrared spectroscopy confirmed the formation of urethane groups and allowed the calculation of the carbonyl index and the degree of phase separation. Differential scanning calorimetry and X-ray diffraction indicated the amorphous behavior of the obtained bio-based materials. It was established that not only the thermal stability but also the degradation steps depended on the structure of the hard segments and the phase separation between hard and soft segments. The modification of hard segments was also revealed in the results of thermomechanical and mechanical behavior of bio-PU which indicated a mixed phase structure.

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利用改性生物基异氰酸酯合成高性能生物基聚氨酯的绿色路线

对可持续发展和循环经济的需求促使人们开发更环保的创新材料和技术。本文的重点是利用生物单体（包括生物基异氰酸酯）合成一类新型生物基聚氨酯（PUs）。这项工作的新颖之处在于使用生物基改性异氰酸酯，通过两步无溶剂合成新型浇铸生物基聚（酯-聚氨酯）和聚（醚-聚氨酯）。对设计和制备的生物基聚氨酯进行了化学结构、热稳定性、机械和热机械性能分析。傅立叶变换红外光谱证实了聚氨酯基团的形成，并计算了羰基指数和相分离程度。差示扫描量热法和 X 射线衍射表明所获得的生物基材料具有无定形特性。结果表明，不仅热稳定性，降解步骤也取决于硬段的结构以及硬段和软段之间的相分离。生物聚氨酯的热力学和机械行为结果也显示了硬段的改性，表明其具有混合相结构。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Industrial Crops and Products 农林科学-农业工程

CiteScore

9.50

自引率

8.50%

发文量

1518

审稿时长

43 days

期刊介绍： Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.