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Hydrophobic Coating on Cellulosic Textile Material by Betulin and a Betulin Based Polymer

by Tianxiao Huang

Institution:	Linnæus University
Year:	2016
Keywords:	Betulin; biorefinery; cellulose; contact angle; copolymer; hydrophobicity; marketing strategy; standard spray test; textile fibers; water repellency.; Engineering and Technology; Materials Engineering; Textile, Rubber and Polymeric Materials; Tekni
Posted:	02/05/2017
Record ID:	2135493
Full text PDF:	http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-53446

Abstract

Betulin is a naturally abundant compound in the outer bark of birch and can be easily obtained by solvent extraction. Herein, solutions of betulin were used to treat cellulosic textile fibers and improve their water repellency. Cotton fabrics impregnated in a 7.5 g L-1 solution of betulin in ethanol showed the highest water contact angle of about 153° while the impregnation in a 3.75 g L-1 solution resulted in a close effect. A terephthaloyl chloride-betulin copolymer was synthesized and dissolved in tetrahydrofuran to afford a solution with a concentration of 3.75 g L-1. The cotton fabric impregnated in this solution showed a water contact angle of 150°. Changes in morphology of the cellulose fibers before and after the treatment were observed by scanning electron microscopy, and the water repellency was measured by a standard spray test. The marketing strategy of the potential product, which will be developed based on this technique, was discussed.