Abstract
Hydrogel polymers were prepared via graft polymerization of acrylamide (AAm) onto chitosan (CTS) backbone in the presence of methylene bisacrylamide (MBA) as cross-linker and ammonium persulfate (APS) as an initiator. Optimizing the crosslinking graft reaction of AAm onto CTS was studied by varying the concentration of CTS and MBA cross-linker and discussing the effect of these conditions on the gel fraction and the grafting parameters. The grafting parameters; grafting percentage (%GP), grafting efficiency (%GE), Add-on (%A) and homopolymer (%H) were studied as a function of the chitosan and the cross-linker concentrations. Also the swelling properties of the prepared hydrogel were examined. In this research, the simple second order kinetic model proposed by Schott has been carried out to describe the swelling mechanism. The effect of the grafting reaction on the thermal properties of the chitosan was also investigated by the thermal gravimetric analysis (TGA). The structure of the prepared hydrogel polymer was confirmed by FT-IR spectra. The porous structure of the hydrogel was observed by the Scanning Electron Microscope (SEM) and also the elemental composition of the prepared hydrogel was identified by using the energy dispersive X-ray (EDX).
Highlights
Chitosan is derived from chitin by deacetylation using strong alkali
The hydrogel is a water-swollen polymer which cannot dissolve in the medium of swelling as a result of their three-dimensional crosslinked network
This material has gained considerable attention in the last years because of the need to exploit its unique properties in a wide range of applications such as drug delivery, metal and dye removal, agricultural uses, coal dewatering, and separation technology
Summary
Chitosan is derived from chitin by deacetylation using strong alkali. It is a safe polysaccharide and non-toxic. Chitosan has commonly employed in various fields such as water treatment [4, 5, 6], drug release [7], packaging films [8], and agriculture [9], many efforts are exerted to modify its structure by grafting and crosslinking to enhance specific properties such as the ability to absorb and retain large amount of fluid. This type of modification creates a material combining the properties of the natural material and the synthetic part. The effect of the grafting reaction on the thermal properties of the chitosan was investigated
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