Versatile value-added application of hyperbranched lignin derivatives: Water-resistance adhesive, UV protection coating, self-healing and skin-adhesive sensing

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2021-01, Vol.404, p.126358, Article 126358
• Main Authors: Wang, Wentao, Wang, Fei, Zhang, Cheng, Tang, Jiaoning, Zeng, Xierong, Wan, Xuejuan
• Format: Article
• Language: English
• Subjects: Adhesive; Lignin-grafted copolymers; Room temperature self-healing; Skin-adhesive strain sensor; UV protection coatings
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2020.126358

[Display omitted] •The versatile lignin copolymers were synthesized via a surface RAFT polymerization.•Hyperbranched structure of lignin provides improved adhesive performances.•Adhesive performances could be well controlled by altering the content of VI.•Room temperature self-healing elastomer was achieved by appropriate VI content. Bio-based copolymers with versatile properties and good processability are highly desired for practical applications. Herein we describe novel hyperbranched adhesive, UV protective coatings and functional elastomers with 6.1–9.5 wt% lignin synthesized by a one-pot RAFT grafting polymerization. The unique macromolecular structure and sufficient hydrogen bonds of these Lignin-graft-poly(n-butyl acrylate-co-1-vinylimidazole) copolymers (Lignin-BVs) resulted in fascinating and controllable features. Specifically, incorporating 13.9 wt% imidazole (VI) effectively improved the adhesive performances with maximal adhesive force and strength up to 34.0 N and 367.8 N·s, respectively, which were better than the commercial 3 M double-sided adhesive. Owing to water-resistance and UV absorption capacity, our Lignin-BVs could be served as excellent adhesive coatings for future outdoor decorative materials, safety clothing or beach umbrella. Moreover, upon increasing VI content to 19.4 wt%, Lignin-BV19.4 elastomer showed automatically room temperature self-healing behavior and could be fabricated into skin-adhesive strain sensor. Our studies provided a green and effective method in the preparation of the high value-added lignin copolymers, which could be appealing to both frontier research and industrial development.