Pressure as Stimulus for UCST-type Polymer Systems
The pressure-sensitivity of microgels and block-copolymer micelles will be investigated, In all cases, polymers with an Upper Critical Solution Temperature (UCST) will be employed, meaning that the UCST-type polymers turn insoluble at low temperatures but are soluble at high temperatures. The UCST polymers comprise poly(ethyl acrylate) in (deuterated) isopropanol and aqueous poly(dimethylaminoethyl methacrylate) in presence of multivalent counterions (amino-containing block shows UCST-properties in presence of hexacyanoferrates). The former example will be achieved by help of poly(ethyl acrylate) microgels, while poly(dimethylaminoethyl methacrylate)-block-poly(ethylene oxide) is the polymer of choice in aqueous medium, which forms micelles at low temperatures. We expect a change of the UCST with pressure though the extent and direction of the phase separation temperature shift is unknown so far. Changes in swelling of the microgel and a pressure-invoked (de-)micellization will answer these open questions, giving a fundamental new insight into pressure-sensitive materials.
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PLAMPER Felix; BOCHENEK Steffen; BRUGNONI Monia; Leonardo Chiappisi; MELLE Andrea; RICHTERING Walter; SCHMIDT Maximilian Marcel; M. Friederike Schulte; SCHWEINS Ralf and Andrea Scotti. (2018). Pressure as Stimulus for UCST-type Polymer Systems. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1849
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