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Polymerization of methyl methacrylate by imidazole–carbon tetrachloride charge‐transfer system
Author(s) -
Goswami Aradhana,
Baruah Shashi D.,
Dass Narendra N.
Publication year - 1996
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/(sici)1097-4628(19960516)60:7<991::aid-app9>3.0.co;2-h
Subject(s) - polymerization , polymer chemistry , methyl methacrylate , dimethyl sulfoxide , chemistry , reaction rate constant , imidazole , perchlorate , carbon tetrachloride , photochemistry , kinetics , polymer , organic chemistry , ion , physics , quantum mechanics
The kinetics of charge‐transfer (CT) polymerization of methyl methacrylate (MMA) in the presence of imidazole (Imy) and CCl 4 was studied in dimethyl sulfoxide (DMSO) at 60°C. The rate of polymerization ( R p ) is sensitive to the [CCl 4 ] up to a concentration of 0.60 mol L −1 , but at a higher concentration, it is practically independent of the [CCl 4 ]. When [CCl 4 ] > [Imy], R p is proportional, to [MMA] 1.45±0.15 and [Imy] 0.53±0.04 and the average rate constant for the polymerization of MMA is 3.25±0.41 × 10 −6 L mol −1 s −1 . This article also reports the polymerization of MMA initiated by Imy and CCl 4 and accelerated by hexakis (dimethyl sulfoxide) iron (III) perchlorate, [Fe(DMSO) 6 ] (CIO 4 ) 3 (A), at 60°C. The presence of Fe(Imy) 3+ 3 in the polymerization system produced well‐defined induction periods. The rate constant at 60°C for the interaction of the poly(MMA) radical toward Fe(Imy) 3+ 3 is 7.19 × 10 4 L mol −1 s −1 . A probable reaction mechanism for the polymerization system has been postulated to explain the observed results. © 1996 John Wiley & Sons, Inc.