|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; Teknik och teknologier; Materialteknik; Textil-, gummi- och polymermaterial; Innovation through Business, Engineering and Design - Specialisation Business, Master Programme, 120 credits; Innovation genom ekonomi, teknik och design - inriktning företagsekonomi, masterprogram, 120 hp; Teknik; Technology|
|Full text PDF:||http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-53446|
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.