Abstract
Silk is a protein fiber which has especial properties. in order to achieve these desirable properties, it is necessary that the sericin of silk is separated from its fibroin and to compensate for the lost weight of silk caused by degumming, silk is weighted. This study aims to investigate the effects of anhydride and its solvents on silk fiber weighting by grafting the environmentally friendly natural polysaccharide (chitosan). Since functional groups of chitosan didn’t establish link to
silk yarn, after degumming, silk was treated with anhydride and by placing the active groups of carboxyl on it, the possibility of weighting silk up to 20% is provided. The effect of the kind of anhydride on the degree of anhydride addon and the following graft of chitosan, using two anhydride acids(succinic anhydride and phetalic anhydride) in N,Ndimethylformamide (DMF) and N,N-dimethylsulfoxyde (DMSO) was examined. tensile testing machine, FTIR
spectroscopy and scanning electron microscopy (SEM) was used in order to investigate the effect of different anhydrides and their solvents on yarn’s tenacity, functional groups, morphological structure, yellowness and the degree of acid dye exhaust before and after being treated by anhydride and chitosan. Observations indicate that chitosn grafting by succinic
anhydride in DMF solvent bears the best results
Keywords: weighting, grafting, silk, chitosan, anhydride.

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مدیر سایت دوشنبه 2 اردیبهشت‌ماه سال 1392 ساعت 06:39 ق.ظ