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RESEARCH FRONT
Contents Vol 62(11)

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

Robert Rotzoll A and Philipp Vana A B
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A Institut für Physikalische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 6, D-37077 Göttingen, Germany.

B Corresponding author. Email: pvana@uni-goettingen.de

Australian Journal of Chemistry 62(11) 1473-1478 https://doi.org/10.1071/CH09189
Submitted: 3 April 2009  Accepted: 21 May 2009   Published: 20 November 2009

Abstract

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.


Acknowledgements

Financial support by the Deutsche Forschungsgemeinschaft within the frame of the Graduate School 782 and the project VA226/4–1 is gratefully acknowledged. P.V. acknowledges receipt of a Heisenberg-Professorship (DFG). Special thanks go to Britta Fuchs and Susanne Seyffarth from the Institut für Materialphysik in Göttingen for taking SEM images of our samples.


References


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