Journal of the Chilean Chemical Society
versión On-line ISSN 0717-9707
SADEGHI, MOHAMMAD y HOSSEINZADEH, HOSSEIN. STUDIES ON GRAFT COPOLYMERIZATION OF 2-HYDROXYETHYLMETHACRYLATE ONTO KAPPA-CARRAGEENAN INITIATED BY CERIC AMMONIUM NITRATE. J. Chil. Chem. Soc. [online]. 2010, vol.55, n.4, pp. 497-502. ISSN 0717-9707. http://dx.doi.org/10.4067/S0717-97072010000400019.
The polysaccharide, kappa-carrageenan (kC), has been chemically modified by graft copolymerization of 2-hydroxyethylmethacrylate (HEMA) in an aqueous medium using ceric ammonium nitrate (CAN) as an initiator under argon atmosphere. A plausible reaction mechanism of grafting has been suggested. Evidence of grafting was obtained by comparison of FTIR spectra of kC and homopolymer-free kC-g-poly(HEMA) as well as solubility characteristics and gravimetric analysis of the products. The optimum reaction conditions affording maximum grafting ratio and add-on value have been determined. The grafting parameters have been found to increase with increasing in kC, CAN, and HEMA concentrations as well as polymerization time and temperature, up to a certain value, but these parameters decrease on further increasing in reaction conditions.
Palabras clave : polymer synthesis; carrageenan; -hydroxyethylmethacrylate; graft copolymerization; ceric ammonium nitrate.