Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7793519 | Carbohydrate Polymers | 2014 | 7 Pages |
Abstract
The graft copolymerization of N,Nâ²-dimethylacrylamide onto guar gum initiated by potassium peroxymonosulphate/glycolic acid redox pair in an aqueous medium was studied gravimetrically under a nitrogen atmosphere. Grafting ratio, grafting efficiency and add on increase on increasing the concentration of potassium peroxymonosulphate (8.0 Ã 10â3 to 24.0 Ã 10â3 mol dmâ3) and glycolic acid concentration (4.4 Ã 10â3 to 7.6 Ã 10â3 mol dmâ3). On increasing the hydrogen ion concentration from 4 Ã 10â3 to 12.0 Ã 10â3 mol dmâ3, grafting ratio, efficiency, add on and conversion were increased. Maximum grafting was obtained when guar gum and N,Nâ²-dimethylacrylamide concentration were 1.0 Ã 10â2 g dmâ3 and 14.0 Ã 10â2 mol dmâ3, respectively. An increase in temperature from 25 °C to 45 °C, the grafting ratio increases but conversion and homopolymer decrease. The optimum time period for graft copolymerization was 2 h. The graft copolymers were characterized by IR spectroscopy and thermogravimetric analysis.
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Physical Sciences and Engineering
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Authors
Vijay Shankar Pandey, Shiv Kumar Verma, Mithilesh Yadav, Kunj Behari,