Biobased films from amphiphilic lignin-graft-PLGA copolymer

• Published in: Bioresources Vol. 18; no. 3; pp. 5887 - 5907
• Main Authors: Mendez, Omar E., Astete, Carlos E., Hermanová, Soňa, Boldor, Dorin, Orts, William, Sabliov, Cristina M.
• Format: Journal Article
• Language: English
• Published: North Carolina State University 01.08.2023
• Subjects: ampiphilic; biodegradable film; contact angle; lignin; x-ray photoelectron spectroscopy (xps)
• ISSN: 1930-2126; 1930-2126
• DOI: 10.15376/biores.18.3.5887-5907

Amphiphilic copolymers were synthesized by grafting poly(lactic-co-glycolic) acid with two lignin types: alkaline lignin and lignosulfonate. An interphase formation technique was used to produce films based on the copolymers. Films presented one side as being more hydrophobic (O-side) and smoother, and the second side more polar and with an uneven surface (W-side). Contact angle of water on the W-side was lower than the O-side corresponding to a higher lignin content and influenced by the lignin type (alkaline < lignosulfonate) and lignin: PLGA ratio. X-ray photoelectric spectroscopy analysis showed higher percentages of sulfur on the W-side, which supports a preferential partitioning of the lignin. Tensile testing demonstrated the significant impact of lignin type on the mechanical properties of the films. Alkaline films showed a higher maximum strength, a higher stiffness, and a higher tensile strength at the elastic limit compared to lignosulfonate films. However, for lignosulfonate films, ductility at break point was 4-fold higher than that of alkaline films.