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Dual dynamic lignin-based covalent adaptable networks: Multiple recyclability and photothermal healing capabilities
School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China; Zhejiang Provincial Innovation Center Advanced Textile Technology, Shaoxing 312030, China.
School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China.
School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China; Zhejiang Provincial Innovation Center Advanced Textile Technology, Shaoxing 312030, China.
School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China; Zhejiang Provincial Innovation Center Advanced Textile Technology, Shaoxing 312030, China.
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2025 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 503, article id 158652Article in journal (Refereed) Published
Abstract [en]

The growing emphasis on sustainable development has underscored the importance of replacing petroleum-based resources with bio-based alternatives and integrating covalent adaptable networks (CANs) as recyclable adhesives. However, combining a green synthesis process with rapid recycling capabilities remains a significant challenge. In this work, commercially available organosolv lignin (OL) was acrylated and subsequently cured with pentaerythritol triacrylate (PTA) and poly (propylene glycol) bis (2-aminopropyl ether) 400 (PEA D400) through a click reaction, specifically Aza-Michael addition, to fabricate CANs featuring dual dynamic bonds (hydroxyl-ester and β-amino ester). The thermodynamic and mechanical properties of the networks were tuned by varying the acrylated lignin-to-PTA ratio. These materials demonstrated adhesive properties on various substrates with shear strengths above 1.5 MPa on wood, aluminum, polycarbonate, and more. The incorporation of dual dynamic bonds facilitated rapid stress relaxation within 3 min at 160 °C. Leveraging these dynamic features, both uncured and cured resins could be swiftly re-bonded with a 10-minute hot pressing post-failure. Additionally, adhesive layers could be peeled and rebonded within 5 min at elevated temperatures, achieving adhesion strengths up to 2.1 times that of the original samples. Furthermore, the photothermal properties of lignin enabled light-controlled healing, highlighting its potential for on-demand adhesive applications. This work presents an eco-friendly and sustainable strategy for the challenges of adhesive recovery.

Place, publisher, year, edition, pages
Elsevier BV , 2025. Vol. 503, article id 158652
Keywords [en]
Click reaction, Covalent Adaptable Networks, Lignin, Photothermal conversion, Recoverable Adhesive
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-358194DOI: 10.1016/j.cej.2024.158652ISI: 001391648700001Scopus ID: 2-s2.0-85212218606OAI: oai:DiVA.org:kth-358194DiVA, id: diva2:1924821
Note

QC 20250121

Available from: 2025-01-07 Created: 2025-01-07 Last updated: 2025-01-21Bibliographically approved

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Hakkarainen, Minna

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