Ceric ammonium nitrate induced grafting of polyacrylamide onto carboxymethyl chitosan

• Published in: Carbohydrate polymers Vol. 67; no. 3; pp. 427 - 435
• Main Authors: Joshi, Jigar M., Sinha, Vijay Kumar
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.02.2007; Elsevier Science
• Subjects: Acrylamide; acrylamides; Applied sciences; CAN; Carboxymethyl chitosan; ceric ammonium nitrate (CAN); chitosan; composite polymers; drug delivery systems; duration; Exact sciences and technology; Graft copolymerization; Natural polymers; nitrates; Physicochemistry of polymers; polymerization; redox reactions; Starch and polysaccharides; temperature; Acrylamide; CAN; Carboxymethyl chitosan; Graft copolymerization; Graft copolymer; Cerium IV; Experimental study; Grafting; Optimization; Chitosan derivatives; Aqueous medium; Morphology; Preparation; Acrylamide copolymer; Oside polymer; Processing parameter; Acid copolymer
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2006.06.021

O-Carboxymethyl chitosan (CMCH) was prepared and characterized by FTIR spectroscopy and X-ray diffraction. Grafting of acrylamide (Am) onto CMCH using ceric ammonium nitrate (CAN) as an initiator was carried out under nitrogen atmosphere in aqueous solution. Evidence of grafting was confirmed by comparison of FTIR spectra of CMCH and the grafted copolymer as well as scanning electron micrography (SEM) and X-ray diffraction of the products. The effects of concentration of CAN, Am, reaction time and temperature on graft copolymerization were studied by determining the grafting percentage, grafting efficiency and percentage add-on. With other conditions kept constant, the optimum grafting conditions were obtained as follows: CMCH = 2 g, CAN = 0.2 M, and Am = 0.563 mol/L, reaction temperature = 40 °C, and reaction time = 4.5 h.