Modification of sodium salt of partially carboxymethylated tamarind kernel powder through grafting with acrylonitrile: Synthesis, characterization and swelling behavior

作者：Trivedi J H^*; Jivani J R; Patel K H; Trivedi H C

来源：Chinese Journal of Polymer Science, 2013, 31(12): 1670-1684.

DOI：10.1007/s10118-013-1366-9

• Sodium salt of partially carboxymethylated tamarind kernel powder
• Acrylonitrile
• Graft copolymerization
• Superabsorbent hydrogels
• Swelling behavior

A graft copolymer of polyacrylonitrile (PAN) with sodium salt of partially carboxymethylated tamarind kernel powder (Na-PCMTKP, ) was synthesized by using ceric ammonium nitrate (CAN) as a redox initiator in an aqueous medium. The optimum reaction conditions for affording maximum percentage of grafting were established by successively varying reaction conditions such as concentrations of nitric acid, CAN, monomer (AN) as well as reaction time, temperature and amount of substrate. The influence of these reaction conditions on the grafting yields was discussed. The kinetic scheme of free radical graft copolymerization was proposed and the experimental results were found to agree very well with the proposed kinetic scheme. The graft copolymer (Na-PCMTKP-g-PAN, percentage of grafting G = 413.76% and percentage of grafting efficiency GE = 96.48%) sample synthesized under the established optimized reaction conditions was hydrolyzed by 0.7 mol center dot L-1 NaOH solution at 90-95A degrees-C to yield the superabsorbent hydrogel, H-Na-PCMTKP-g-PAN. The swelling behavior of the hydrogel was studied by carrying out its absorbency measurements in low conductivity water, 0.15 mol center dot L-1 salt (NaCl, CaCl2 and AlCl3) solutions and simulated urine (SU) solution at different timings. FTIR, TGA and SEM techniques were used to characterize the products.

• 出版日期2013-12