Swelling and switching of doubly thermo-responsive diblock copolymer films
In a set of recent experiments we have investigated the swelling and switching of thermo-responsive homopolymer and copolymer films, which exhibit a lower critical solution temperature (LCST) type phase transition from a swollen to a collapsed chain conformation. Such films are nano-scale sensors. The thermal response of these sensor films to e.g. a temperature change from below LCST (23 °C) to above LCST (45 °C) showed an unexpected behavior, which has been related to the chain collapse and water release, relaxation and reswelling. In the proposed experiment we want to increase the complexity of the thermos-responsive films by using doubly responsive films instead of the previously addressed singly responsive films. The novel diblock copolymer has a LCST and an UCST type block and undergoes two phase transitions with increasing temperature. At the instrument D17 we are able to follow the kinetic of the transition from a swollen to a collapsed hydrogel film with neutron reflectivity with a time resolution of 10 seconds! Deuterated water (D2O) is used to achieve a high contrast.
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MUELLER BUSCHBAUM Peter; BIESSMANN Lorenz; CUBITT Robert; LASCHEWSKY Andre; METWALLI Ezzeldin; PAPADAKIS Christine; PHILIPP Martine and ZHONG Qi. (2015). Swelling and switching of doubly thermo-responsive diblock copolymer films. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1752
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