Thermo-stimulable hydrogels based on PEG chains cross-linked by fatty acids self-assemblies of tunable structure
We aim here at characterizing hydrogels made of Poly(ethylene-glycol) (PEG) chains cross-linked by physical nodes made of self-assemblies of 12-hydroxystearic acid, that have a temperature tuneable structure. HSA molecules self-assemble into micrometric multilamellar tubes at low temperature and nanometric micelles above a given threshold temperature. The PEG chains are grafted by HSA moieties at each end, so that their hydrophobized extremities insert within the self-assembled HSA aggregates. We have already studied the system with short 5k PEG chains and showed that the HSA self-assemblies transit from multilamellar tubes to decorated vesicles in presence of PEG grafted chains. We plan now at studying the system in presence of larger grafted PEG chains with contrast variations experiments to solve the respective structure of HSA aggregates and polymer chains in the mixtures. We have already successfully synthetized the deuterated chains that are necessary for such experiments.
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ALMEIDA Maeva; COUSIN Fabrice; DUDZINSKI Daniel; GRZELKA Marion; LE COEUR Clemence; PREVOST Sylvain and ROUSSEAU Bastien. (2023). Thermo-stimulable hydrogels based on PEG chains cross-linked by fatty acids self-assemblies of tunable structure. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-680
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