Grafting of PMMA brushes on titania nanoparticulate surface via surface-initiated conventional radical and “controlled” radical polymerization (ATRP) |
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Authors: | G K Raghuraman Jürgen Rühe Raghavachari Dhamodharan |
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Institution: | (1) Department of Chemistry, Indian Institute of Technology, Madras, Chennai, 600 036, India;(2) Institute for Microsystems and Technology (IMTEK), University of Freiburg, Freiburg, Germany |
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Abstract: | Stable dispersion of titania nanoparticles in organic solvents are obtained by grafting poly(methyl methacrylate) layer on
to the surface. Titania nanoparticles are synthesized through the hydrolysis of titanium (IV) isopropoxide. The average size
of the titania particles is found to be 15 ± 2 nm. The polymer layer was introduced onto the surface by immobilizing the initiating
moiety. Azo initiator moiety required for surface-initiated conventional free radical polymerization and a tertiary bromide
initiator moiety required for ATRP are attached covalently to the titania nanoparticulate surface through the surface hydroxyl
groups. The “encapsulation” of PMMA layer results in the steric stabilization of the titania nanoparticles. Another important
finding is that it is possible to grow polymer layer in a controlled fashion. |
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Keywords: | Titania nanoparticles Surface-initiated polymerization ATRP Hydridosilane Polymer brushes Polymer encapsulation Composite nanomaterial |
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