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Comparison of Reaction Kinetics and Gelation Behaviors in Atom Transfer, Reversible Addition–fragmentation Chain Transfer and Conventional Free Radical Copolymerization of Oligo(ethylene Glycol) Methyl Ether Methacrylate and Oligo(ethylene Glycol) Dimethacrylate by Qiang Yu; Sijia Xu; Hongwen Zhang; Yonghong Ding; Shiping Zhu is a Materials Science article available to read on EtoBox.

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The reaction kinetics and gelation behavior in atom transfer radical polymerization (ATRP), reversible addition-fragmentation chain transfer (RAFT), and conventional free radical copolymerizations (FRP) of oligo(ethylene glycol) methyl ether methacrylate (OEGMEMA) and oligo(ethylene glycol) dimethacrylates (OEGDMAs) were investigated and compared with respect to the polymerization rate, gel point, and the evolution of network with vinyl conversion. All the three systems experienced autoacceleration in the reaction rate but occurred at different regions of vinyl conversion, caused by diffusion-controlled radical reactions: termination in the FRP, addition in the RAFT, and deactivation in the ATRP, respectively. In the FRP, significant amount of gel materials was collected by solvent extraction far before the onset of macro-gelation detected by an abrupt increase in complex viscosity. However, in the RAFT and ATRP, no gels were found until the systems approached their macro-gelation points. The observation suggests limited intramolecular crosslinking/cyclization reactions in the ATRP and RAFT systems. This is because the slow growth of primary chains (ATRP and RAFT in hours versus FR

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Author

Qiang Yu; Sijia Xu; Hongwen Zhang; Yonghong Ding; Shiping Zhu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

2009

Language

EN

Field

Materials Science (Physical Sciences)