A facile strategy to fabricate a lignin-based thermoset alternative to formaldehyde-based wood adhesives
- Chinese Academy of Forestry (CAF), Nanjing (China); Nanjing Forestry University (China)
- Chinese Academy of Forestry (CAF), Nanjing (China)
- Chinese Academy of Forestry (CAF), Nanjing (China); Nanjing Forestry University (China); Beijing Forestry University (China)
- Nanjing Forestry University (China)
- University of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- University of Tennessee, Knoxville, TN (United States)
The utilization of sustainable lignin to synthesize wood adhesives has attracted increasing attention in recent years. However, the facile fabrication of strong and environmentally friendly lignin-based adhesives with a high lignin content remains a significant challenge. In this study, we developed a formaldehyde-free wood adhesive system by combining alkali lignin and poly(propylene glycol) bis(2-aminopropyl ether). The process of producing lignin-based adhesives involves a simple mixing of wood flour, lignin, and a commercially available crosslinker (polyetherimide), followed by direct hot-pressing into particleboards. The lignin-based adhesive showed a high biomass content of 75 wt% (crosslinker accounting for 25 wt%) and the internal bonding strength of the formaldehyde-free and non-toxic particleboards was 1.42 MPa, outperforming many other bio-based adhesives. In conclusion, the study demonstrates a new and facile strategy to synthesize a lignin-based thermoset that is readily and practically applicable as an adhesive to fabricate high-performance, high lignin content, and formaldehyde-free wood products.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- Chinese Academy of Forestry (CAF); National Natural Science Foundation of China (NSFC); USDOE
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1997727
- Journal Information:
- Green Chemistry, Journal Name: Green Chemistry Journal Issue: 15 Vol. 25; ISSN 1463-9262
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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