Polyurethanes and polyesters from lignin

• Published in: Journal of applied polymer science Vol. 98; no. 3; pp. 1451 - 1456
• Main Authors: Bonini, Carlo, D'Auria, Maurizio, Emanuele, Lucia, Ferri, Rachele, Pucciariello, Rachele, Sabia, Anna Rita
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 05.11.2005; Wiley
• Subjects: Applied sciences; biomaterials; Exact sciences and technology; Lignin and derivatives; Natural polymers; Physicochemistry of polymers; polyesters; polyurethanes; Molecular structure; Morphology; Polyurethane; Ester polymer; Polyol; biomaterials; Experimental study; Chemical reactivity; Polyaddition; polyurethanes; polyesters; Lignin derivatives
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.22277

Lignin, obtained through steam explosion from straw, was completely characterized via elemental analysis, gel permeation chromatography, ultraviolet and infrared spectroscopy, and 13C and 1H nuclear magnetic resonance spectrometry. Polyurethanes were obtained by treating steam‐exploded lignin from straw with 4,4′‐methylenebis(phenylisocyanate), 4,4′‐methylenebis(phenylisocyanate) –ethandiol, and poly(1,4‐butandiol)tolylene‐2,4‐diisocyanate terminated. The obtained materials were characterized by using gel permeation chromatography, infrared spectroscopy, and scanning electron microscopy. Differential scanning calorimetry analysis showed a Tg at −6°C, assigned to the glass transition of the poly(1,4‐butandiol) chains. The presence of ethylene glycol reduced the yields of the polyurethanes. The use of the prepolymer gave the best results in polyurethane formation. Steam‐exploded lignin was used as the starting material in the synthesis of polyesters. Lignin was treated with dodecanoyl dichloride. The products were characterized by using gel permeation chromatography, infrared spectroscopy, 13C and 1H nuclear magnetic resonance spectrometry, and scanning electron microscopy. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1451–1456, 2005