Pressure-induced demicellization of PNIPAM-based micelles
We are interested in the pressure dependence of micelles in aqueous solution based on poly(N-isopropyl acrylamide). Linear precipitated PNIPAM-based chains showed a pressure-dependant solvation above its transition temperature. This should lead in case of micelles to a dissolution of the self-assemblies when using a PNIPAM-based core-forming block. Hence, pressure can then act as a stimulus to induce and reverse micellization. This would be to our best knowledge the first prove of an order-disorder transition of micelles upon induced pressure. We started to investigate this pressure influence in our last proposal 9-10-1414. Our obtained results showed that we can induce an irreversible morphology change by applying pressure. In this project, we would like to study reversible and irreversible morphology changes upon pressure application by help of PNIPAM-b-PDMAM-based micelles. A good method to detect the pressure-dependent changes of PNIPAM micelles in aqueous solution is SANS. The D11 instrument would provide a high contrast and the perfect q-value range to determine the pressure dependence of size and morphology of our micelles/dissolved diblock copolymers.
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STEINSCHULTE Alexander; BOCHENEK Steffen; PLAMPER Felix; SCHNEIDER Sabine; SCHWEINS Ralf; Andrea Scotti; WARREN Nicholas and WINTER Roland. (2016). Pressure-induced demicellization of PNIPAM-based micelles. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1470
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