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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1021/la4039864
|2 doi
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|a eng
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| 100 |
1 |
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|a Kuttner, Christian
|e verfasserin
|4 aut
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|a Direct thiol-ene photocoating of polyorganosiloxane microparticles
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|c 2013
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 27.08.2014
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|a Date Revised 31.12.2013
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a This work presents the modification of polyorganosiloxane microparticles by surface-initiated thiol-ene photochemistry. By this photocoating, we prepared different core/shell particles with a polymeric shell within narrow size distributions (PDI = 0.041-0.12). As core particle, we used highly monodisperse spherical polyorganosiloxane particles prepared from (3-mercaptopropyl)trimethoxysilane (MPTMS) with a radius of 0.49 μm. We utilize the high surface coverage of mercaptopropyl functions to generate surface-localized radicals upon irradiation with UVA-light without additional photoinitiator. The continuous generation of radicals was followed by a dye degradation experiment (UV/vis spectroscopy). Surface-localized radicals were used as copolymer anchoring sites ("grafting-onto" deposition of different PB-b-PS diblock copolymers) and polymerization initiators ("grafting-from" polymerization of PS). Photocoated particles were characterized for their morphology (SEM, TEM), size, and size distribution (DLS). For PS-coated particles, the polymer content (up to 24% in 24 h) was controlled by the polymerization time upon UVA exposure. The coating thickness was evaluated by thermogravimetric analysis (TGA) using a simple analytical core/shell model. Raman spectroscopy was applied to directly follow the time-dependent consumption of thiols by photoinitiation
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|a Journal Article
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1 |
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|a Maier, Petra C
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kunert, Carmen
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Schlaad, Helmut
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Fery, Andreas
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 29(2013), 52 vom: 31. Dez., Seite 16119-26
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|x 1520-5827
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| 773 |
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|g volume:29
|g year:2013
|g number:52
|g day:31
|g month:12
|g pages:16119-26
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|u http://dx.doi.org/10.1021/la4039864
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