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Soy protein concentrate was grafted with ethylmethacrylate using ascorbic acid/potassium persulphate as a redox initiator. Different reaction parameters, such as reaction time, reaction temperature, solvent amount, initiator ratio, and pH, and monomer concentration were optimized to get maximum graft yield (134.12%). The graft copolymer formed was characterized by Fourier transform infrared spectrophotometer, X-ray diffraction, and scanning electron microscope techniques. Thermogravimetric analysis, differential thermal analysis, and differential thermogravimetric analysis studies showed that graft copolymer was thermally more stable than the backbone. Thermal decomposition studies indicated that the rate of weight loss per minute was found more in case of backbone when compared with that of graft copolymer. Further, graft copolymer was also found more resistant toward acid-base attack and was found to be more water repellent.

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In the recent study, microwave induced novel interpenetrating polymeric network (IPN) hydrogel based on gum copal-collagen (GcA-coll) has been reported for the efficient removal of malachite green dye from the waste water. The IPN [(GcA-coll)-cl-poly (AAm-ip-AA)] was synthesized using potassium persulfate (KPS)-N,N 0 -methylene-bis-acrylamide (MBA) as initiator-crosslinker system, acrylamide (AAm) as primary monomer and acrylic acid (AA) as secondary monomer under microwave radiations. The Response Surface Methodology (RSM) design was used to optimize the percentage swelling of the candidate IPN hydrogel. RSM based Central Composite Design (CCD) was applied to the three most crucial synthesis parameters like initiator concentration, monomer concentration and crosslinker concentration so as to maximize the percentage swelling. The optimum conditions for the removal of 88% malachite green dye from waste water are pH $ 7, initial dye concentration 5 12 mg mL 21 , adsorbent dose 5 500 mg. Pseudo first order and Pseudosecond order models were applied to study the kinetics and the mechanism of adsorption was studied by intraparticle diffusion model. The equilibrium data was further evaluated by Langmuir and Freundlich isotherm models. The synthesized IPN was found to be a propitious candidate to be used as a green adsorbent for removing malachite green dye from waste water. POLYM. ENG. SCI., 00:000-000,