Peroxydisulfate initiated synthesis of potato starch-graft-poly(acrylonitrile) under microwave irradiation

Abstract

Abstract. Potato starch-graft-poly(acrylonitrile) could be efficiently synthesized using small concentration of ammonium peroxydisulfate (0.0014 M) in aqueous medium under microwave irradiation. A representative microwave synthesized graft copolymer was characterized using Fourier Transform Infrared Spectroscopy, X-ray Diffraction, Scanning Electron Microscopy and Thermogravimetric Analysis. Under microwave conditions oxygen removal from the reaction vessel was not required and the graft copolymer was obtained in high yield using very small amount of ammonium peroxydisulfate, however using the same amount of ammonium peroxydisulfate (0.0014 M) on thermostatic water bath no grafting was observed up to 98°C (even in inert atmosphere). Raising the concentration of the initiator to 0.24 M resulted into 10% grafting at 50°C but in inert atmosphere. The viscosity/shear stability of the grafted starch (aqueous solution) and water/saline retention ability of the microwave synthesized graft copolymer were also studied and compared with that of the native potato starch.

Gum ghatti based novel electrically conductive biomaterials: A study of conductivity and surface morphology

“…The swollen hydrogel was dried with filter paper and drained for some time until no free water remained. After weighing the swollen hydrogel on an analytical balance (accuracy ±0.00001 g), the percentage swelling (P s ) may be calculated by using the Equation (2) [27]: (2) where W s is the weight of swollen polymer and W d is the weight of dry polymer.…”

Graft copolymerization of MMA onto flax under different reaction conditions: a comparative study

“…Thermal stability, crystallinity and morphology of the graft copolymers were also studied [2]. Modifying the properties of natural polymers through graft copolymerization has been reported by various workers [3][4][5][6][7][8][9][10][11][12][13]. Since the grafting under pressure and microwave radiations is meagerly reported in literature, so in the present manuscript, we report the grafting of MMA onto flax under different reaction conditions and a comparative study has been made.…”

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“…Under the influence of microwave dielectric heating, the generation of free radicals from the initiators facilitates the grafting reactions 28 .…”