Thermo-stimulable hydrogels based on polymer cross-linked by fatty acids self-assemblies
We aim at determining the structure of thermo-responsive hydrogel obtained by the mixing of PEG polymers chains that are terminally grafted at both ends by small surfactants with the pure same surfactant. The chosen surfactant is 12-hydroxystearic acid (HSA), a fatty acid that forms multi-lamellar tubes at low temperature and nanometric spherical micelles above a threshold temperature. We expect that the terminal hydrophobic chain of PEG will insert in fatty acid aggregates that will play the role of thermoresponsive nodes for the resulting hydrogels. Promising first rheological measurements demonstrate that the shear modulus of hydrogels increases by a factor 1000 by playing on temperature. We ask 2 days of beamtime of SANS in to elucidate the structure of: (i) solutions of HSA-grafted PEG without addition of free HSA molecules; (ii) hydrogels. For the last part, we will use the contrast variation technique to solve the respective structure of HSA aggregates and polymer chains in the mixtures.
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LE COEUR Clemence; ALMEIDA Maeva; AMIEL catherine; COUSIN Fabrice; DUDZINSKI Daniel; PREVOST Sylvain and RERZKI-VERITE Cecile. (2021). Thermo-stimulable hydrogels based on polymer cross-linked by fatty acids self-assemblies. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-2041
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