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生物基Vitrimer高分子材料的研究进展

Research Progress on Bio-based Vitrimer Materials

  • 摘要: 传统高分子材料分为热塑性材料和热固性材料,热塑性材料可二次加工但刚性不足,热固性材料虽刚性大但回收困难。类玻璃高分子(Vitrimer)材料则介于热塑性材料与热固性材料之间,是一种具有高交联密度网络、可进行二次加工的材料。根据Vitrimer的网络交换机理重点介绍了生物基类玻璃高分子的发展史和研究进展,对基于不同共价键的生物Vitrimer进行了详细介绍:动态酯交换反应的条件相对温和,反应速度快,反应原料广泛,但材料力学性能和可逆性较差;动态二硫键交换的可逆性与可控性更好,且反应对外界酸碱环境要求并不苛刻,然而反应底物一般具有毒性和刺激性气味;动态亚氨键交换可使得材料具有良好的机械性能和耐久性,生物相容性较好,但反应条件与原材料选择相对单一。综述了生物基Vitrimer材料的应用与优势,动态共价键的引入弥补了传统3D打印材料刚性不足和功能单一的缺点,增强了碳纤维复合材料的综合性能,提高了弹性体材料的使用寿命及自我修复效率。并对未来发展前景做出了展望。

     

    Abstract: Traditional polymer materials were divided into thermoplastic materials and thermoset materials. Thermoplastic materials could be processed twice but not rigid enough, and thermoset materials were rigid but difficult to recycle. The glass-like polymer material was between thermoplastic material and thermosetting material, which was a kind of material with high crosslinking density network and could be processed twice. Based on the network exchange mechanism of Vitrimer, this paper focused on the development history and research progress of bio-based glass polymers. Bio-vitrimers based on different covalent bonds were introduced in detail. Generally, the conditions of dynamic transesterification reaction were relatively mild, the reaction speed was fast, and the reaction materials were extensive, while the mechanical properties and reversibility of materials were poor. The reversibility and controllability of dynamic disulfide bond exchange were better, and the reaction was not harsh to the external acid-base environment, while the reaction substrate generally had toxic behavior and pungent odor. Dynamic imine bond exchange could make the material had good mechanical properties and durability, and good biocompatibility, while the reaction conditions and raw material selection were relatively simple. The application and advantages of bio-based Vitrimer materials were reviewed. The introduction of dynamic covalent bonds made up for the shortcomings of traditional 3D printing materials, such as insufficient rigidity and single function, enhanced the comprehensive performance of carbon fiber composites, and improved the service life and self-healing efficiency of elastomer materials. Finally, the paper gived a prospect of the future development.

     

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