Water Repellent and Antibacterial Modification of Cellulose using Fluoroalkyl End-Capped Oligomers.

Surface modification of cellulose to give an antibacterial property as well as water- and oil-repellency was studied using fluoroalkyl end-capped oligomeric allylammonium hydrochloride, allylammonium hydrochloride-fluorosilane combined system, and fluorosilanes having tributylphosphonium segments. (1) In the case of modification with oligomeric allylammonium hydrochloride alone, oil-repellency increased in spite of low water-repellency. After immersion in water for Ih, modification effects were missing, which indicated the low water-durability of modification. (2) By combining allylammonium hydrochloride oligomer and fluorosilanes, modified cellulose surface exhibited high water- and oil-repellency. Modification effects were maintained even after immersion in water for 24h. Based on the ESCA analysis, it is suggested that allylammonium hydrochloride oligomer would be kept in the siloxane network on the cellulose surface. (3) Modification with fluorosilanes having tributylphosphonium segments could also change cellulose surface to highly water- and oil-repellent. Modified surface showed good microbiostasis activity against Staphylococcus aureus.