Grafting of polyacrylonitrile onto guar gum under microwave irradiation

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Abstract
Using microwave (MW) irradiation grafting of polyacrylonitrile (PAN) onto guar gum in water was done without using any radical initiator or catalyst within a very short reaction time. The extent of grafting could be adjusted by controlling the reaction conditions and maximum percentage grafting (%G) of about 188% was obtained under optimum conditions in 1.66 min. The average molecular weight of the grafted PAN chains and water-retention power of the alkali hydrolyzed MW-grafted gums were also determined and compared with those of the conventionally synthesized (cs) graft copolymer. A representative MW-grafted copolymer, guar-g-polyacrylonitrile was characterized by IR, NMR, XRD, TGA, and elemental analysis. A plausible mechanism for the grafting under MW was proposed.

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