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Graft Copolymerization of Methacrylamide onto Guar Gum Using a Potassium Chromate/Malonic Acid Redox Pair
Author(s) -
Behari Kunj,
Kumar Rajesh,
Tripathi Mala,
Pandey Peeyoosh Kant
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010601)202:9<1873::aid-macp1873>3.0.co;2-e
Subject(s) - methacrylamide , grafting , chemistry , malonic acid , copolymer , guar gum , polymer chemistry , nuclear chemistry , inorganic chemistry , organic chemistry , polymer , biochemistry , acrylamide
The effect of reaction conditions on the grafting parameters during the grafting of methacrylamide (MAM) onto guar‐gum (GOH) using potassium chromate/malonic acid redox pair was studied under nitrogen atmosphere at different temperatures. On increasing the chromate ion concentration (from 3.5×10 –3 mol·dm –3 to 20.0×10 –3 mol·dm –3 ) grafting parameters were found to increase. Grafting ratio, efficiency, and add on were found to increase with the increase in malonic acid concentration from 3.5×10 –3 mol·dm –3 to 10.0×10 –3 mol dm –3 . It was observed that maximum efficiency was obtained when the monomer concentration was 20.0×10 –3 mol·dm –3 . With increasing hydrogen ion concentration, grafting parameters were found to increase. Homopolymer concentration, however, was found to decrease with increasing hydrogen ion concentration. Optimum temperature and time for grafting of MAM onto guar gum were found to be 35°C and 120 min respectively. The graft copolymer was characterized by IR spectroscopy and thermogravimetric analysis.