Title: Light-triggered radical silane-ene chemistry using a monoalkyl substituted bis(trimethylsilyl)silane
Language: English
Authors: Steindl, Johannes 
Svirkova, Anastasiya 
Marchetti-Deschmann, Martina 
Moszner, Norbert
Gorsche, Christian
Category: Research Article
Forschungsartikel
Issue Date: 2017
Journal: Macromolecular Chemistry and Physics
ISSN: 1521-3935
Abstract: 
Chain transfer agents (e.g., thiols) enrich radical photopolymerization for use in advanced applications such as stereolithography, optical materials, and biomedicine. Resulting thiolene-based photopolymers exhibit numerous benefits such as tunable thermomechanical properties, and give access to spatially resolved functional materials. Silane-ene chemistry could serve as alternative to this popular thiol-ene approach. A monosubstituted bis(trimethylsilyl)silane (MSiH) is synthesized by a simple one pot procedure. Photoinitiated radical silane-ene chemistry has been performed with multiple enes and the conversions are assessed by 1H NMR spectroscopy. Compared to the most reactive silane from literature, tris(trimethylsilyl)silane (TTMSSiH), the radical reactivity of MSiH is reduced in all tested formulations, but the possibility for further functionalization and accessibility of multifunctional MSiH-derivatives is upheld. A silane-acrylate formulation is found to be most promising. In comparison to a thiolacrylate system, a more uniform conversion of the chain transfer agent and acrylate is shown for the silaneacrylate formulation with MSiH. The promising results for the silane-acrylate system are confirmed by further tests (i.e., NMR spectroscopy, GPC, and MALDI MS), giving additional information on molecular weight regulation and radical mechanism. First MSiH-based photopolymer networks have been fabricated and analyzed via DMTA, thus paving the way for future silane-acrylate networks.
Keywords: chain transfer; hydrosilylation; photopolymerization; thiol‐ene
DOI: 10.1002/macp.201600563
Library ID: AC15334431
URN: urn:nbn:at:at-ubtuw:3-5396
Organisation: E163 - Institut für Angewandte Synthesechemie 
Publication Type: Article
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