Abstract: Silver nanoparticle colloid was prepared through the reduction of silver nitrate by modified hyperbranched polymer (MHBP) in aqueous solution. The generated silver nanoparticles were characterized by UV-Vis, XRD, Nano-Sizer and TEM. The diameter of silver nanoparticle was around 10 nm and could disperse well in the aqueous solution with excellent stability. Then the silver nanoparticle colloid was diluted in order to treat the silk fabric. The results showed that there were plenty of silver nanoparticles dispersed well on the surface of silk fibers. The treated silk fabric exhibited excellent antibacterial activity. When the silver content of treated silk fabric was 109.80 mg/kg, the bacterial reduction rates against S.aureus and E.coli were 99.46% and 99.25% respectively, and beyond 98% even after washing 50 times.

Key words: amino-terminated hyperbranched polymer, silver nanoparticle, antibacterial finishing, silk fabric