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Acrylamide polymerization initiated with the redox system Ce(IV)‐cyclohexanone in micellar phase: A kinetic study
Author(s) -
Patra Manabendra,
Sinha Bijoy K.
Publication year - 1998
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/(sici)1521-3935(19980301)199:3<311::aid-macp311>3.0.co;2-2
Subject(s) - chemistry , polymerization , cyclohexanone , polymer chemistry , sodium dodecyl sulfate , acrylamide , redox , micelle , bromide , pulmonary surfactant , critical micelle concentration , aqueous solution , emulsion polymerization , polyacrylamide , solution polymerization , monomer , inorganic chemistry , polymer , organic chemistry , catalysis , biochemistry
The effect of an organized anionic surfactant, i.e. sodium dodecyl sulfate (SDS), on the acrylamide (AM) polymerization initiated with the redox system Ce(IV)‐cyclohexanone (CH) in aqueous nitric acid was kinetically studied over a temperature range of 25–45°C. With increasing concentration of SDS, above its critical micelle concentration (CMC) the rate of polymerization, R p(obs) , as well as the rate of Ce(IV) consumption, − R Ce(obs) , were found to increase, while in the presence of cetyltrimethylammonium bromide (CTAB) these rates decreased considerably. R p(obs) is proportional to [Ce(IV)] 0.5 , [CH] 0.5 and [AM] 1.5 . − R Ce(obs) also increases with increasing concentration of Ce(IV), cyclohexanone and acrylamide. The overall activation energy for the process, in the presence and absence of 15 × 10 −3 M of SDS, was calculated to be 15.1 and 21.4 kcal/mol, respectively. The viscosity average molecular weight of polyacrylamide was found to increase with increasing SDS concentration. A suitable mechanistic scheme for the polymerization process is proposed.