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International Journal of Biological Macromolecules

International Journal of Biological Macromolecules

IF: 7.7
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Ultra-strong and solvent-resistant lignin-based non-isocyanate polyurethane adhesives: One-pot strategy toward versatile bonding

Published:11 December 2024 DOI: 10.1016/j.ijbiomac.2024.138622 PMID: 39672421
Jintao Zhang,?Jin Sun,?Xiaohong Zhou,?Rongxian Ou,?Lichao Sun,?Chuigen Guo,?Qi Fan,?Zhenzhong Gao

Abstract

Isocyanate-free polyurethane adhesives have attracted considerable attention as a promising environmentally friendly alternative. However, their progress has been hindered by insufficient bonding performance and weak solvent resistance, as well as the laborious synthesis processes involved. Herein, we successfully synthesized a high-performance lignin-based non-isocyanate adhesives (LNIPUs-G) through a one-pot strategy that combines the polycondensation of carbonate groups with polyether amines and aldehyde-amine chemistry. The former aspect circumvents the limitations associated with cyclic carbonate polyaddition while providing a molecular composition containing both rigid and flexible segments along with a high-density polar groups. Concurrently, the rapid hyperbranching process in the latter aspect significantly contributes to achieving a robust crosslinked network. As a result, the LNIPUs-G demonstrates exceptional resistance to boiling water with bond strengths of up to 1.32?MPa when applied to plywood, surpassing previously reported bio-based adhesives. Moreover, the adhesive exhibits remarkable versatility across a wide range of substrates including steel, iron, copper, carbon fiber reinforced composites, ceramics, aluminum, wood, and glass. Additionally, the adhesive has excellent resistance to an extensive range of organic solvents. Life cycle assessment (LCA) results demonstrate that the high-performance and cost-effective LNIPUs-G is expected to disrupt the dominance of bulk formaldehyde- and isocyanate-based adhesives industry.

Substances (5)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Dimethyl sulfoxide 67-68-5 C2H6OS 1344 suppliers $15.00-$120900.00
Sodium chloride 7647-14-5 ClNa 1215 suppliers $5.00-$6678.62
Sodium hydroxide 1310-73-2 NaOH 1210 suppliers $14.00-$16472.00
Tetrahydrofuran 109-99-9 C4H8O 1103 suppliers $9.00-$17160.00
Hexane 110-54-3 C6H14 846 suppliers $20.00-$5500.00

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