4.2 Article

A Bipedal Silica-Immobilized Azo-Initiator for Surface-Confined Radical Polymerizations

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AUSTRALIAN JOURNAL OF CHEMISTRY
卷 62, 期 11, 页码 1473-1478

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CSIRO PUBLISHING
DOI: 10.1071/CH09189

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  1. Deutsche Forschungsgemeinschaft [VA226/4-1]

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The present study introduces the silica-anchored azo-initiator 4,4'-azobis(4-cyano-N-(3 ''-triethoxysilylpropyl)-valeric amide) (ACTA) for the surface-initiated polymerization of methyl acrylate (MA) with and without additional grafted reversible addition-fragmentation chain transfer (RAFT) agents 1,4-bis(3'-trimethoxysilylpropyltrithiocarbonylmethyl)benzene and 1,6-bis(o,p-2'-trimethoxysilylethylbenzyltrithiocarbonyl)hexane. While the sole use of silica-linked ACTA produced grafted poly(methyl acrylate) (pMA) of high molecular weight, due to a 2D Trommsdorff effect, the polymerization in combination with the fixed RAFT agents exhibited living behaviour with increasing molecular weights during polymerization. Silica-pMA hybrids were further analyzed via thermogravimetric analysis and scanning electron microscopy, which revealed significant differences between the three approaches.

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