Abstract
Graft copolymerization of 4-vinylpyridine (4-VP) was carried out on unmodified cotton and partially carboxymethylated cotton (PCMC), using ceric ammonium nitrate as initiator. The grafting parameters were studied as a function of temperature and amount of cellulose. With unmodified cotton, the graft yield increased up to 40° and then decreased on increasing temperature. Graft yields for PCMC increased with increasing temperature and reached a constant value beyond 30°. Carboxymethyl groups attached to cellulose enhanced both graft yield and grafting efficiency as well as the ceric ion consumption. The molecular weight of grafted poly(4-VP) was obtained viscometrically after hydrolysing away the cellulose backbone, and it was found to decrease while the graft frequency increased with temperature. The activation energies were found to be 32.6 and 8.7 kJ/mol for PCMC and unmodified cotton respectively. The weight increase of cellulose due to grafting increased with increasing content of cellulose in the reaction mixture. The presence of occluded air in the grafting system caused a decrease in graft yield.
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