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Polymerization of methyl methacrylate by charge-transfer mechanism with 2,2′-bipyridine and iron (III) complex

✍ Scribed by Shashi D. Baruah; Aradhana Goswami

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
171 KB
Volume
64
Category
Article
ISSN
0021-8995

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✦ Synopsis

Polymerization of methyl methacrylate (MMA) by the charge-transfer complex formed by the interaction of 2,2-bipyridine (bpy), MMA, and carbon tetrachloride (CCl 4 ) was studied in dimethylsulfoxide (DMSO) at 60ЊC. The rate of polymerization (R p ) is sensitive to the [CCl 4 ] at low concentration of CCl 4 , but at a higher concentration it is practically independent of [CCl 4 ]. R p is proportional to [MMA] 1.45{0.04 and [bpy] 0.52{0.04 when [CCl 4 ] ú [bpy], and the average rate constant, k, at 60ЊC for the polymerization of MMA was 7.14 { 0.40 1 10 06 L mol 01 s 01 . Kinetic studies showed that the polymerization proceeds through free radical intermediates. This article also reports the polymerization of MMA initiated by bpy and CCl 4 and accelerated by Lewis acid, hexakis(dimethylsulfoxide)iron(III) perchlorate [Fe(DMSO) 6 ](ClO 4 ) 3 at 60ЊC. The glass transition temperature and molecular weights of the samples were investigated by using differential scanning calorimetry and gel permeation chromatography techniques, respectively. Probable reaction mechanisms are proposed to explain the observed results.

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