Journal
POLYMERS
Volume 11, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/polym11071202
Keywords
lignin; polyurethane; adhesives; foams; coatings; elastomers
Categories
Funding
- Wood-Based Composites Center, a National Science Foundation Industry/University Cooperative Research Center [1624536-IIP]
- Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy (EERE) [DE-EE0008148]
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Polyurethane chemistry can yield diverse sets of polymeric materials exhibiting a wide range of properties for various applications and market segments. Utilizing lignin as a polyol presents an opportunity to incorporate a currently underutilized renewable aromatic polymer into these products. In this work, we will review the current state of technology for utilizing lignin as a polyol replacement in different polyurethane products. This will include a discussion of lignin structure, diversity, and modification during chemical pulping and cellulosic biofuels processes, approaches for lignin extraction, recovery, fractionation, and modification/functionalization. We will discuss the potential of incorporation of lignins into polyurethane products that include rigid and flexible foams, adhesives, coatings, and elastomers. Finally, we will discuss challenges in incorporating lignin in polyurethane formulations, potential solutions and approaches that have been taken to resolve those issues.
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