Green Synthesis of Lignin Cyclic Carbonates for Non-Isocyanate Polyurethanes
The Problem
The development of lignin-based cyclic carbonate technology is essential to address the environmental and health concerns associated with conventional polyurethane (PU) production, which relies on toxic isocyanates. Lignin, a widely available byproduct of the pulp and paper industry, is typically underutilized and burned for energy. Valorizing lignin into high-value materials like non-isocyanate polyurethane (NIPU) offers a sustainable alternative. This technology enables the transformation of lignin into a reactive building block through a green CO₂ fixation process, paving the way for safer, renewable, and circular polymer production.
The Solution
Researchers at the University of Tennessee have developed an eco-friendly method for synthesizing cyclic carbonated lignin with mild reaction conditions. The process avoids toxic solvents and catalysts, significantly improving safety and sustainability. The resulting carbonated lignin can react with diamines at room temperature to form non-isocyanate polyurethane (NIPU), eliminating the need for hazardous isocyanates. Additionally, the method is compatible with various lignin types and achieves high yields, making it scalable and versatile for industrial applications in green plastics and coatings.
Benefits
| Benefit |
|---|
| Suitable for a wide variety of lignin sources (Kraft, organosolv, lignosulfonates, etc.) |
| Enables 100 % biobased non-isocyanate polyurethane synthesis |
More Information
- Derek Eitzmann
- Assistant Technology Manager
- 865-974-1882 | deitzman@tennessee.edu
- UTRF Reference ID: 24157-03
- Patent Status: Pending
Innovators
Arthur Ragauskas
Department Head, Chemical and Biomolecular Engineering Governor's Chair for Biorefining
In 2014, he assumed a Governor’s Chair for Biorefining based in University of Tennessee’s Department of Chemical and Biomolecular Engineering, with a complementary appointment in the UT Institute of Agriculture’s Department of Forestry, Wildlife, and Fisheries and serves in the US Energy and Environmental Sciences Directorate, Biosciences Division, at ORNL. His research program is directed at unde...
In 2014, he assumed a Governor’s Chair for Biorefining based in University of Tennessee’s Department of Chemic...
