Investigation of Grafting Mechanism of Viscose Fabric with Poly (amido amine) Dendrimer Nano-Structure by using Citric Acid

Since poly (amido amine)-dendrimer nanostructures are not able to form a direct covalent bond with cellulose fibers, grafting of G2 and G5-PAMAM dendrimers to viscose fabric might be possible by citric acid as a crosslinking agent. Citric acid (CA) is a three functional carboxylic acid which is able to esterificate viscose cellulose fabric in two steps: the formation of a cyclic anhydride intermediate by the dehydration of carboxyl groups and reaction between viscose and that intermediate to form an esteric bond. Sodium hypophosphite (SHP) was used as catalyst. Afterwards, crosslinking between the free carboxylic acid group of CA and amine end groups of the dendrimers took place by SHP. In this work, we identified formed ester group between acid and viscose fabric by using Fourier transform infrared(FTIR) spectroscopy and formed amide group between CA and amine group of the dendrimers using Attenuated total reflectance-FTIR (ATR-FTIR) spectroscopy.

کلیدواژه ها:

PAMAM dendrimer ، Grafting ، Citric acid ، Viscose ، Nano structure