Polymerization of methyl methacrylate by imidazole–carbon tetrachloride charge-transfer system

✍ Scribed by Aradhana Goswami; Shashi D. Baruah; Narendra N. Dass

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 615 KB
• Volume: 60
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960516)60:7<991::aid-app9>3.0.co;2-h

✦ Synopsis

The kinetics of charge-transfer (CT) polymerization of methyl methacrylate (MMA) in the presence of imidazole (Imy) and CCI, was studied in dimethyl sulfoxide (DMSO) at 60°C. The rate of polymerization (R,) is sensitive t o the [CCl,] up to a concentration of 0.60 mol L-I, but at a higher concentration, it is practically independent of the [CCl,]. When [CCI,] > [Imy], R, is proportional to [MMA]'.45'0.'5 and [ Imy]0.53' 0.04 and the average rate constant for the polymerization of MMA is 3.25 f 0.41 X

L mol-' s-'. This article also reports the polymerization of MMA initiated by Imy and CCl, and accelerated by hexakis(dimethy1 sulfoxide) iron(II1) perchlorate, [Fe(DMSO)6] ( c 1 0 4 ) 3 (A), at 60°C. The presence of Fe(1my)y in the polymerization system produced welldefined induction periods. The rate constant at 60°C for the interaction of the poly(MMA) radical toward Fe(Imy):+ is 7.19 X lo4 L mol-' s-'. A probable reaction mechanism for the polymerization system has been postulated to explain the observed results. 0 1996 John Wiley & Sons, Inc