木质素
聚氨酯
极限抗拉强度
材料科学
复合材料
自愈材料
聚合物
延伸率
弹性体
热稳定性
自愈
化学
有机化学
医学
替代医学
病理
作者
Jiahao Du,Li Wang,Zhiyi Huang,Xiaochun Liu,Xinshan Yin,Jianxin Wu,Wenjing Lin,Xiaofeng Lin,Guobin Yi
标识
DOI:10.1016/j.ijbiomac.2023.125925
摘要
Lignin is a natural polymer with abundant functional groups with great application prospects in lignin-based polyurethane elastomers with self-healing abilities. In this study, a lignin self-healing polyurethane (PUDA-L) was specially designed using lignin as the raw material of polyurethane, combining lignin with Diels-Alder (DA) bond and hydrogen bonds. The experimental results showed that PUDA-L was prepared with good thermal stability, fatigue resistance, shape memory effect, excellent mechanical strength, and self-healing ability by partially replacing the crosslinking agents with bio-based lignin and hydroxylated modified lignin to increase the hydroxyl content. Polyurethane has a tensile strength of up to 29 MPa and an elongation at break of up to 500 %. The excellent self-healing ability of PUDA-L originates from the internal DA bonds and cross-linked hydrogen bonds. After the dumbbell sample was fused and heated at 130 °C for 4 h, the elastomer could be completely healed, the tensile strength was restored to 29 MPa, and the self-healing efficiency was up to 100 %. The developed PUDA-L elastomer has promising applications in sensors and smart skins.
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