Role of inter-micellar bridging on the dynamics of thermoresponsive polymer micelles
We propose to investigate the dynamics of thermoresponsive micelles based on polystyrene (PS) and poly-N-isopropylacrylamide (PNIPAM) in water. Stable, low-polydisperse micelles formed by PS-b-PNIPAM di- and PS-b-PNIPAM-b-PS triblock copolymers will be investigated to clarify the role of bridges on their structure and dynamics. This important question has been never addressed before on the microscopic level and leads to new and controlled macroscopic behavior of thermoresponsive polymers. By means of neutron spin echo (NSE) and exploring partially deuterated polymers, we aim at selectively studying the core and shell dynamics of the micelles. Different diblock/triblock mixtures will be investigated to systematically tune the amount of bridges between micelles. Measurements at different temperatures will address how bridges influence the thermoresponsive behaviour of the micelles. NSE would be suitably complemented by small-angle neutron scattering (SANS) to obtain information on the micellar structure. Taking into account measurements at different contrasts (core or shell deuterated), concentrations, and temperatures, we ask for 6 days of NSE and 2 days of SANS beamtime.
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ROSI Benedetta Petra; ALLGAIER Juergen; CZAKKEL Orsolya; FORSTER Stephan; HOLDERER Olaf; KRUTEVA Margarita; PREVOST Sylvain and Kuno Schwärzer. (2023). Role of inter-micellar bridging on the dynamics of thermoresponsive polymer micelles. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1735
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