Peng Jin, Huang Jianhua, Chen Shusheng, Liu Weifeng, Qiu Xueqing
School of Chemistry and Chemical Engineering, State Key Laboratory of Pulp and Paper Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Wushan Road 381, Guangzhou 510640, PR China.
Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang 515200, PR China; School of Advanced Manufacturing, Guangdong University of Technology, Jieyang 515200, PR China; Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Waihuan Xi Road 100, Guangzhou, Guangdong 510006, PR China.
Int J Biol Macromol. 2025 Feb;290:139108. doi: 10.1016/j.ijbiomac.2024.139108. Epub 2024 Dec 23.
Lignin, a renewable and biodegradable polymer, offers a promising alternative to petroleum-based polyols for polyurethane elastomer synthesis. However, its complex structure poses challenges, such as poor dispersibility and reactivity. This study introduces a novel one-step and solvent-free method for synthesizing lignin-containing polyurethane elastomers (SF-LPUes-ONE) with a high lignin substitution rate of at least 30 wt%. By directly incorporating a dispersion of ethanol-extracted lignin and long-chain polyols into the reaction with isocyanates, we successfully prepared SF-LPUes-ONE with remarkable mechanical properties. The tensile strength, elongation at break, and toughness of the resulting sample reached 42.3 MPa, 584.7 %, and 110.0 MJ/m, respectively. In addition, the phenolic hydroxyl groups in lignin endowed SF-LPUes-ONE with excellent anti-aging resistance, ensuring sustained high performance under demanding conditions. Furthermore, the dynamic hydrogen bonding and chemical cross-linking dual-network endowed SF-LPUes-ONE with exceptional shape memory capabilities, achieving shape fixation and recovery rates exceeding 99 % after 3 cycles. This work demonstrates a green and efficient approach to high-performance lignin-based polyurethane elastomers, showcasing their potential for broad industrial applications.
木质素是一种可再生且可生物降解的聚合物，为聚氨酯弹性体合成中基于石油的多元醇提供了一种有前景的替代品。然而，其复杂的结构带来了挑战，如分散性和反应性差。本研究介绍了一种新颖的一步法且无溶剂的方法来合成含木质素的聚氨酯弹性体（SF-LPUes-ONE），其木质素取代率至少为30 wt%，较高。通过将乙醇提取的木质素和长链多元醇的分散体直接加入到与异氰酸酯的反应中，我们成功制备出了具有卓越机械性能的SF-LPUes-ONE。所得样品的拉伸强度、断裂伸长率和韧性分别达到42.3 MPa、584.7%和110.0 MJ/m。此外，木质素中的酚羟基赋予SF-LPUes-ONE优异的抗老化性能，确保在苛刻条件下能持续保持高性能。再者，动态氢键和化学交联双网络赋予SF-LPUes-ONE出色的形状记忆能力，经过3个循环后形状固定率和恢复率超过99%。这项工作展示了一种绿色高效的方法来制备高性能木质素基聚氨酯弹性体，彰显了其在广泛工业应用中的潜力。
