Abstract: For the controllable preparation of nano-silver effectively, in this paper, modified aminoterminated hyperbranched polymer(MHBP-OH) with core-shell structures was prepared by grafting line polymers on the amino-terminated hyperbranched polymer(HBP-NH2). The MHBP-OH was applied to prepare nano-silver in aqueous solution and graft in cotton fiber for in-situ fabricating nano-silver to realize antibacterial finishing. The generated silver nanoparticles were characterized and the corresponding analysis of performance were given on the treated cotton fabric. The results indicated that average grain diameter of nano-silver generated in aqueous solution was 3.82 nm with excellent stability. The nano-silvers generated in cotton fibers were well distributed and their size was about 10 nm. When the silver content of treated cotton fabric was 146.26 mg/kg, the bacterial reduction rates against S.aureus and E.coli were 99.76% and 99.62% respectively. The silver content still kept in 126.61 mg/kg even suffering laundering after 30 times.

Key words: modified hyperbranched polymer; nano-silver; cotton fabric; in-situ generation; antibacterial finishing