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Stimuli responsive graft polysiloxanes

Abstract : Stimuli sensitive amphiphilic polymers based on partially substituted graft polysiloxanes were obtained and characterized. The polymers were synthesized in a two-step reaction, starting from a polysiloxane with chlorobenzile groups in the side chain. In the first step, the polysiloxane was modified with dinitro- or azo-aromatic group and, in the second step, the unreacted chlorobenzile groups were grafted with thermo-sensitiue poly (N, N-dimethylacrylamide (PDMA) side chains in a Single Electron Transfer-Living Radical Polymerization (SET-LRP) reaction. The polymer structures and their properties were investigated by 1H-NMR spectroscopy, DSC, fluorescence and UV-VIS spectroscopy and rheology. Because of the amphiphilic character, these polymers are self-assembling in aqueous solution in a core-shell micelles, the critical concentration of the aggregation value being in the 10-1 range. The thermo-sensitive character, the lower critical solution temperature (LCST) and the conformational changes of the side-chains are evidenced by rheological temperature sweep tests.
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https://hal-cea.archives-ouvertes.fr/cea-01847299
Contributor : Léna Le Roy <>
Submitted on : Monday, July 23, 2018 - 2:34:33 PM
Last modification on : Monday, February 10, 2020 - 6:13:45 PM

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  • HAL Id : cea-01847299, version 1

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A.D. Rusu, C. Ibanescu, E. Resmerita, B. Simionescu, M. Danu, et al.. Stimuli responsive graft polysiloxanes. Revista de Chimie, 2013, 64 (6), pp.667-671. ⟨cea-01847299⟩

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