Spider Silk-Inspired NIPU Adhesives with High Bonding Strength and Avoidance of Isocyanate Harm Derived from CO 2 and Biomass

作者：Ping Zhang, Yu Wang, Xiaoyan Wu, Yizhong Cao, Jin Wang, Zhe Wang, Chunde Jin · 发表于：ACS Sustainable Chemistry & Engineering · 年份：2025 · DOI：10.1021/acssuschemeng.5c06979 · 被引用次数：5 · 研究领域：biodegradable polymer synthesis and properties、Additive Manufacturing and 3D Printing Technologies、Polymer composites and self-healing

Following the implementation of stricter environmental policies, nonisocyanate polyurethane (NIPU) adhesives are shifting toward renewable biomass and CO 2 utilization. However, their inferior mechanical properties compared to traditional PU hinder widespread application. Inspired by the microphase-separated structure of spider silk, this study introduces lignin as a β-sheet nanocrystal biomimetic into a linear CO 2 -based NIPU matrix. The resultant NIPU composite forms a three-dimensional hydrogen-bonding network formed between the hydroxyl groups of lignin and the NIPU matrix, achieving an enhanced tensile strength (15.07 MPa) and optimal bonding strength (1.52 MPa). This bioinspired strategy provides a novel route for valorizing lignin and CO 2 while establishing foundations for high-performance NIPU adhesives.