Intelligent Superabsorbent Polymer Composites Based On Chitosan-graft-polyacrylamide And Carboxymethylcellulose

Résumé: A series of intelligent superabsorbent polymers composites based on Chitosan-graft-polyacrylamide and carboxymethylcellulose (CTS-g-PAAm/CMC) was prepared through free radical graft-copolymerization of acrylamide (AAm) onto chitosan backbone in aqueous medium using potassium persulfate and N,N’-methylenebisacrylamide as initiator and crosslinker, respectively. The formation of the grafted network was evidenced by Attenuated Total reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) and Thermogravimetric Analysis (TGA). Scanning Electron Microscopy (SEM) has showed a typical porous structure. The composites were also partially hydrolyzed to achieve superabsorbents with ampholytic properties. The effect of CMC content on the swelling capacities of these superabsorbent composites was examined in doubly distilled water and various pH swelling media. The water absorbency was enhanced by adding CMC in the network, where the highest value was reached at 1 wt % of CMC. Also, their hydrolysis has not only greatly optimized their absorption capacity but also improved their swelling rate. These composites have displayed a pH-responsiveness, in where two maxima at pH 4 and 8 were clearly observed after hydrolysis. From TGA analysis, the addition of the CMC into the grafted CTS-g-PAAm has marginally affected its thermal stability. The antibacterial activity tests of these composites against S. Aureus and E. Coli have showed moderate inhibition of the bacteriocides growth.

Publié dans la revue: Journal of Materials, Processes and Environment