Temperature, pH and electric stimulus responsive hydrogels from Gum ghatti and polyacrylamide-synthesis, characterization and swelling studies

In this paper, hydrogel composed of acrylamide (AAm) and Gum ghatti was prepared under pressure by free radical initiation reaction using potassium persulphate (KPS)-ascorbic acid (ABC) redox pair as an initiator and N,N’-methylene-bis-acrylamide (MBA) as a crosslinker. Synthesized polymer was found to be pH, temperature and electrical stimulus sensitive. Various optimized reaction parameters were: reaction time (min), 180; amount of solvent (ml), 10; pH, 7.0; ABC:KPS (initiator ratio, mol:mol), 0.5:1.0; pressure (psi), 9.0; [AAm] (molL-1), 0.7042; [MBA] (molL-1), 0.0649. The synthesized superabsorbent was characterized using different characterization techniques like, FTIR, SEM, TGA/DTA/TDG and X-ray diffraction. Crosslinked network was found to be thermally more stable than the backbone. Swelling studies of candidate was done in the deionized water as a function of time, temperature and pH of swelling medium. Effect of electrical stimuli on the deswelling behavior of the candidate polymer was investigated in AC and DC voltage as a function of time of current flow and voltage applied

Author(s): Balbir Singh Kaith, Rajeev Jindal , Hemant Mittal and Kiran Kumar

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