title: Graft [partially carboxymethylated guar gum-g-poly N-(hydroxymethyl) acrylamide] copolymer: from synthesis to applications.
abstract: Graft copolymer of N-(hydroxymethyl) acrylamide with carboxymethylated guar gum was synthesized and the reaction conditions were optimized for better yield using potassium peroxymonosulfate and thiourea as a redox initiator. The optimum reaction conditions for grafting have also been determined by studying the effect of N-(hydroxymethyl) acrylamide, hydrogen ion, peroxymonosulphate, thiourea concentration and carboxymethylated guar gum along with time and temperature. Experimental results show that maximum grafting has been obtained at 1.4 g dm(-3) concentration of carboxymethylated guar gum and 16×10(-2) mol dm(-3) concentration of N-(hydroxymethyl) acrylamide. It has been observed that grafting ratio, add on, conversion, efficiency and rate of grafting increase up to 6.0×10(-3) mol dm(-3) of hydrogen ion, 2.4×10(-3) mol dm(-3) of thiourea, 14×10(-3) mol dm(-3) of peroxymonosulphate and 35°C of temperature. Grafted copolymer has been characterized by FTIR spectroscopy and thermogravimetric analysis. Water swelling, flocculating, and metal ion uptake properties of partially carboxymethylated guar gum-g-N-(hydroxymethyl) acrylamide have been determined.
authors.affiliation: Polymer Science Research Laboratory, Department of Chemistry, University of Allahabad, Allahabad, India.
authors.forename: Vijay Shankar
authors.initials: VS
authors.lastname: Pandey
authors.affiliation: Polymer Science Research Laboratory, Department of Chemistry, University of Allahabad, Allahabad, India.
authors.forename: Shiv Kumar
authors.initials: SK
authors.lastname: Verma
authors.affiliation: Polymer Science Research Laboratory, Department of Chemistry, University of Allahabad, Allahabad, India. Electronic address: kunjbehari1234@rediffmail.com.
authors.forename: Kunj
authors.initials: K
authors.lastname: Behari
mesh_terms: D020106:Acrylamide / Q000138:chemical synthesis / Q000737:chemistry*; D000327:Adsorption; D005427:Flocculation; D005685:Galactans / Q000138:chemical synthesis / Q000737:chemistry*; D008351:Mannans / Q000138:chemical synthesis / Q000737:chemistry*; D053149:Plant Gums / Q000138:chemical synthesis / Q000737:chemistry*; D058105:Polymerization
chemical_list: D005685:Galactans; D008351:Mannans; D053149:Plant Gums; D020106:Acrylamide; C007894:guar gum
keywords: Graft copolymer; N-(Hydroxymethyl) acrylamide; Partially carboxymethylated guar gum; Physicochemical properties