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Synthesis of branched poly(methyl methacrylate)s: Effect of the branching comonomer structure

Isaure, F. and Cormack, P.A.G. and Sherrington, D.C. (2004) Synthesis of branched poly(methyl methacrylate)s: Effect of the branching comonomer structure. Macromolecules, 37 (6). pp. 2096-2105. ISSN 0024-9297

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Abstract

Branched poly(methyl methacrylate)s have been prepared using conventional solution phase free radical polymerization of methyl methacrylate (MATA) in the presence of a branching divinyl comonomer with appropriate levels of dodecanethiol (DDT) chain transfer agent added to inhibit gelation. The branching comonomers employed were five ethylene glycol dimethacrylates with varying lengths of PEG chains, divinylbenzene (DVB), and ethylene glycol diacrylate (EGDA). Soluble branched polymers were obtained in good yield with a MMA/brancher mole ratio up to 100/15. The minimum mole ratio of DDT required to avoid gelation was evaluated. The isolated polymers were characterized by elemental analysis to determine the level of DDT incorporated, by H-1 NMR spectroscopy, to determine the molecular composition and in particular the level of brancher incorporated (both as a branch unit and as a pendant functionality), and by double detection SEC in order to evaluate the level of branching. The differing behaviors of the branchers are discussed with a focus on a comparison of ethylene glycol dimethacrylate (EGDMA), EGDA and DVB. The latter brancher has been shown to produce the most regularly branched material with the smallest molar mass distributions. In general, however, the latter are broad or very broad.

Item type: Article
ID code: 511
Keywords: CONDENSING VINYL POLYMERIZATION, FREE-RADICAL COPOLYMERIZATION, CHAIN TRANSFER AGENT, HYPERBRANCHED POLYMERS, METHYL-METHACRYLATE, FACILE SYNTHESIS, REACTIVITY, STAR, Chemistry
Subjects: Science > Chemistry
Department: Faculty of Science > Pure and Applied Chemistry
Related URLs:
Depositing user: Mr Derek Boyle
Date Deposited: 09 Mar 2006
Last modified: 12 Mar 2012 10:35
URI: http://strathprints.strath.ac.uk/id/eprint/511

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