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Preparation of high capacity weak base poly(methyl methacrylate)–ethylene glycol dimethylacrylate copolymer anion exchange resin by modification using NO x
Author(s) -
Sinha Shishir,
Jayaswal Namita,
Kumar Anil
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.12432
Subject(s) - ethylene glycol dimethacrylate , methyl methacrylate , nitration , ion exchange resin , materials science , polymerization , polymer chemistry , copolymer , polymer , methacrylate , suspension polymerization , ethylene glycol , nuclear chemistry , chemical engineering , chemistry , composite material , organic chemistry , methacrylic acid , engineering
Macroporous poly(methyl methacrylate)–ethylene glycol dimethylacrylate (PMMA–EGDM) resin (resin 1) was prepared by suspension polymerization and gelatin was found to be the key component deciding the size of particles. To prepare aminated macroporous weak base PMMA–EGDM exchanger, resin 1 was nitrated using NO 2 gas with a minor amount of NO (termed NO x ). The modified PMMA–EGDM resin (resin 2) was reduced to NH 2 groups and the exchange capacity of the weak base anion exchange resin (resin 3) was determined. Regression analysis of NO x consumption versus time and the exchange capacity Q versus time data suggested a second‐order kinetics for the modification reaction and these are reported. We examined the effect of duration of nitration on the exchange capacity of resin 3. It was found that it first increased with the increase in the extent of nitration, reaching a broad maximum of 4.8 meq/g of wet resin with 78% moisture for about 8 h of nitration, and decreasing for longer nitration times as a result of polymer degradation. These results were compared with commercial resin, which had an exchange capacity of 1.68 meq/wet g with 43% moisture content. To assess the salvation ability of the modified PMMA–EGDM resin, consistent with the literature, we devised three stages of removing moisture. Experiments suggest that the high capacity of the modified PMMA–EGDM resin may be attributed to this increased salvation ability. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 1991–1999, 2003