Direct thiol-ene photocoating of polyorganosiloxane microparticles
Kuttner C, Maier PC, Kunert C, Schlaad H, Fery A (2013)
Publication Type: Journal article
Publication year: 2013
Journal
Book Volume: 29
Pages Range: 16119-16126
Journal Issue: 52
DOI: 10.1021/la4039864
Abstract
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. © 2013 American Chemical Society.
Involved external institutions
Universität Bayreuth
Germany (DE)
Max-Planck-Institut für Kolloid- und Grenzflächenforschung / Max Planck Institute of Colloids and Interfaces
Germany (DE)
Germany (DE)
Max-Planck-Institut für Kolloid- und Grenzflächenforschung / Max Planck Institute of Colloids and Interfaces
Germany (DE)
How to cite
APA:
Kuttner, C., Maier, P.C., Kunert, C., Schlaad, H., & Fery, A. (2013). Direct thiol-ene photocoating of polyorganosiloxane microparticles. Langmuir, 29(52), 16119-16126. https://dx.doi.org/10.1021/la4039864
MLA:
Kuttner, Christian, et al. "Direct thiol-ene photocoating of polyorganosiloxane microparticles." Langmuir 29.52 (2013): 16119-16126.
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