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Synthesis and Characterization of Polyhedral Oligomeric Silsequioxane-Core Star Polystyrene via Nitroxide-Mediated Polymerization

Abstract : Multifunctional NMP initiator with a core of cubic silsesquioxane (POSS) was synthesized starting from the coupling of Octa(3-aminopropyl)octasilsesquioxane with 2-Methyl-2-[N-tert-butyl-N-(1-diethoxyphosphoryl-2,2-dimethylpropyl)aminoxy]-N propionyloxysuccinimide. The obtained POSS-based multialkoxyamine was then used as NMP initiator for the polymerization of styrene leading to the formation of star polystyrenes of narrow dispersity with a core consisting of dispersed nanosized hard particles. We demonstrated that stars with a predetermined molecular weight and a control of dispersity could be synthesized by simply controlling reaction parameters and restricting the monomer conversion typically below 30 - 35%. The precise structure of POSS based star polystyrenes was analyzed by the characterization of the individual arms obtained after etching the Si-O-Si bonds of the core. The influence of POSS core on the glass transition temperature of nanocomposites was investigated and compared to that of their cleaved products using differential scanning calorimetry.
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https://hal-amu.archives-ouvertes.fr/hal-01460363
Contributor : Didier Gigmes <>
Submitted on : Tuesday, February 7, 2017 - 4:35:28 PM
Last modification on : Thursday, July 9, 2020 - 1:12:02 PM

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David Glé, Trang N. T. Phan, Valérie Monier, Laurence Charles, Denis Bertin, et al.. Synthesis and Characterization of Polyhedral Oligomeric Silsequioxane-Core Star Polystyrene via Nitroxide-Mediated Polymerization. Progress in Controlled Radical Polymerization: Materials and Applications, 1101, American Chemical Society, pp.141--162, 2012, 0-8412-2757-8. ⟨hal-01460363⟩

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