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Polymers and Polymer Composites

MODIFICATION OF SODIUM SALT OF PARTIALLY CARBOXYMETHYLATED GUAR GUM BY GRAFT COPOLYMERIZATION WITH METHYL ACRYLATE

March 1, 2005 By: Trivedi J H; Patel N K; Trivedi H C; Kalia K Research article

Title: MODIFICATION OF SODIUM SALT OF PARTIALLY CARBOXYMETHYLATED GUAR GUM BY GRAFT COPOLYMERIZATION WITH METHYL ACRYLATE
Page Range: p.301-312
Author(s): Trivedi J H; Patel N K; Trivedi H C; Kalia K
File size: 215K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 13
Issue No: No. 3

Abstract
The grafting of methyl acrylate onto sodium salt of partially carboxylated guar gum was carried out using ceric ammonium nitrate as the redox initiator in an aqueous medium. Reaction variables observed included varying concentrations of initiator, nitric acid, monomer and amount of the backbone, in addition to time and temperature variations, in order to establish the optimised reaction conditions for grafting. The influence of these reaction parameters on the grafting yields and the rates of polymerisation, graft copolymerisation and homopolymerisation, were also studied. A kinetic scheme of free radical graft copolymerisation was proposed and the experimental results were found to agree very well with the proposed kinetic scheme. The graft copolymer sample was characterised by IR spectroscopy, thermal and scanning electron microscopic techniques. 25 refs.

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