Comparison of monomethoxy‐, dimethoxy‐, and trimethoxysilane anchor groups for surface‐initiated RAFT polymerization from silica surfaces |
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Authors: | Dennis Huebner Vanessa Koch Bastian Ebeling Jannik Mechau Judith Elisabeth Steinhoff Philipp Vana |
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Affiliation: | Institut für Physikalische Chemie, Georg‐August‐Universit?t G?ttingen, G?ttingen, Germany |
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Abstract: | The immobilization of reversible addition–fragmentation chain transfer (RAFT) agents on silica for surface‐initiated RAFT polymerizations (SI‐RAFT) via the Z‐group approach was studied systematically in dependence of the functionality of the RAFT‐agent anchor group. Monoalkoxy‐, dialkoxy‐, and trialkoxy silyl ether groups were incorporated into trithiocarbonate‐type RAFT agents and bound to planar silica surfaces as well as to silica nanoparticles. The immobilization efficiency and the structure of the bound RAFT‐agent film varied strongly in dependence of the used solvent (toluene vs. 1,2‐dimethoxyethane) and the anchor group functionality, as evidenced by atomic force microscopy, transmission electron microscopy, dynamic light scattering, and UV/Vis spectroscopy. Surface‐initiated RAFT polymerizations using functionalized silica nanoparticles revealed that grafted oligomers, which often occur in SI‐RAFT, are not formed within the crosslinked structures that originate from the immobilization, and that RAFT‐agent films that show less aggregation during the immobilization are more efficient during SI‐RAFT in terms of polymer grafting density. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53, 103–113 |
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Keywords: | alkoxysilyl ether anchor groups atomic force microscopy interfaces nanocomposites nanoparticles polymer brushes reversible addition fragmentation chain transfer (RAFT) silica nanoparticles silicas surface‐initiated RAFT polymerization surfaces |
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