Lignin as a renewable raw material for polyurethane production

In order to reduce dependence on fossil chemicals and to achieve the net zero targets, lignin-based polyurethanes (LPU) are most desirable. The use of natural and renewable raw materials such as lignin, has a potential to replace petroleum-based polyols in PU synthesis.

Lignin can be further enhanced through chemical modifications like depolymerisation and oxyalkylation to improve the hydrophobic and thermal properties of PUs., shares Prof. (Dr.) G. D. Yadav National Science Chair (SERB/DST/GoI), Emeritus Professor of Eminence, Former Vice Chancellor & R.T. Mody Distinguished Professor & Former Tata Chemicals Darbari Seth Distinguished Professor of Leadership and Innovation, Institute of Chemical Technology. 

Bioengineering aimed at modifying the structure of lignin and incorporating unconventional components has emerged as a promising approach for improving lignin recovery and its subsequent chemical transformation within biorefinery settings. 

Lignin plays a crucial role in reducing the presence of free radicals or reactive oxygen species, thereby providing antioxidant benefits to thermoplastic materials. Additionally, the incorporation of lignin into PLA composites has been shown to improve their thermal and hydrophobic characteristics. (To read the full text, subscribe to the POLYMERS Communique magazine.)

Photo: Ligin powder, Source: Material Archiv