A comparative study on the graft copolymerization of acrylic acid onto rayon fibre by a ceric ion redox system and a γ-radiation method

A review of bioactive plant polysaccharides: Biological activities, functionalization, and biomedical applications

“…Intensive studies have been carried out on the graft copolymerization of cellulosic polymers with suitable hydrophobic monomers to introduce desired functionalities into the cellulosic backbone, so as to overcome the sensitivity of cellulosic fibers towards water/moisture absorption and poor chemical resistance and thus to improve the existing physicochemical properties of the cellulosic polymers (Bashar, Khan, & Idriss Ali, 1995;Kaur, Kumar, & Sharma, 2010;Rattan, Maitra, Misra, & Kaur, 2008;Thakur, Thakur, & Gupta, 2013a). A biocide cellulose carbamate with antimicrobial properties was prepared by impregnating the fibers in aqueous thiourea solution and subsequently grafting with acrylonitrile (Dahou, Ghemati, Oudia, & Aliouche, 2010).…”

Hydrophobic modification of cellulose isolated from Agave angustifolia fibre by graft copolymerisation using methyl methacrylate

“…On the other hand, the decrease in the %GY and %GE values beyond the optimum CAN concentration can be attributed to the formation of Ce(IV)-monomer complexes rather than Ce(IV)-cellulose complexes, which resulted in the increased formation of the homopolymer. There is also a high possibility of termination of the backbone radicals before grafting takes place at increased CAN concentrations, due to the scavenging of the freeradical sites on the cellulose backbone (Scheme 1) (Kaur, Kumar, & Sharma, 2010). In the grafting technique used in this study, the Ce(IV) ions produce free radicals on the cellulose backbone in the presence of HNO 3 .…”

Graft copolymerization of methyl methacrylate onto cellulosic biofibers

“…Water, which also has a zero solvent-transfer constant, does not involve any waste side reactions because of radical transfer. 26 Interaction of the hydroxyl groups of Hibiscus sabdariffa fibers with water through hydrogen bonding helps in swelling and opening of the fiber structure, making it accessible to the monomer and the growing polymeric chains. 26 To study the effect of amount of water during grafting of MMA, graft copolymerization has been carried out as a function of amount of water, and the results are presented in Table I.…”

“…26 Interaction of the hydroxyl groups of Hibiscus sabdariffa fibers with water through hydrogen bonding helps in swelling and opening of the fiber structure, making it accessible to the monomer and the growing polymeric chains. 26 To study the effect of amount of water during grafting of MMA, graft copolymerization has been carried out as a function of amount of water, and the results are presented in Table I. It has been observed that percentage of grafting of MMA shows an initial jump in percentage of grafting with increasing amount of water, from 60 to 90 mL giving maximum (16.71%) grafting in 90 mL and then decreases sharply on further increase in the amount of water and becomes almost constant.…”

“…Furthermore, excess water also affects the formation of the complex of both the cellulosic fibers and the monomer, thus decreasing the generation of the active sites on the cellulosic backbone and initiation of the monomer leading to a decrease in the percentage of grafting. 26 Effect of monomer concentration Table I shows the effect of MMA concentration on grafting parameters. It is clear from the table that the percentage of grafting increases continuously with the increase in monomer concentration of MMA and reaches a maximum value (21.97%) at (MMA) ¼ 2.25 Â 10 À1 moles.…”