Abstract
The present paper reports the modification of guar gum through the grafting of 2-acrylamidoglycolic acid by free radical polymerization using an efficient potassium peroxydiphosphate/thioacetamide redox system in nitrogen atmosphere. The reaction conditions for maximum grafting have been optimized by varying the reaction variables including the concentration of 2-acrylamidoglycolic acid (5.3×10<sup>-2</sup> mol dm<sup>-3</sup>), potassium peroxydiphosphate (1.2×10<sup>-2</sup> mol dm<sup>-3</sup>), thioacetamide (TA) (2×10<sup>-3</sup> mol dm<sup>-3</sup>), sulphuric acid (4×10<sup>-3</sup> mol dm<sup>-3</sup>), guar gum (1 g dm<sup>−3</sup>) along with time duration (150 min) and temperature (35°C). Water swelling capacity and flocculation and studies of synthesized graft copolymer have been performed with respect to the parent polymer. The graft copolymer has been characterized by Fourier transform infrared spectroscopy and thermogravimetric analysis.
Highlights
Modification of natural polymers by grafting has drawn much attention in recent years [1,2,3,4,5]
The IR spectra of guar gum and grafted samples have been recorded with JASCO FT/ IR-5300 model in the range 500 to 4000 cm-1
The thermal data shows that the synthesized graft copolymer is thermally more stable than guar gum
Summary
Modification of natural polymers by grafting has drawn much attention in recent years [1,2,3,4,5]. GG and their derivatives have been used in many areas (e.g. thickening agent, ion exchange resin and suspending agent etc.) It forms colloidal dispersions with water at room temperature and imparts extraordinary viscosity, because of this property, native guar gum as well as its derivatives are commercially imparting and find use in such diverse applications like oil well drilling, paper and textile sizing, as a binding agent for explosives, and is widely used in food industry [6]. Guar gum has wide industrial applications, it suffers from some draw backs like biodegradability [8], which limits its uses considerably These drawbacks can be improved through the grafting of vinyl monomer, which imparts new properties to the polymeric backbone. Taking in mind all of these fascinating applications of acrylamidoglycolic acid (AGA) and guar
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