Impact of chain architecture on the kinetics of chain collapse in thin hydrogel films
Impact of chain architecture on the kinetics of chain collapse in thin hydrogel films: Recently, we have investigated the kinetics of chain collapse of PMDEGA films (see experimental report 9-11-1388) as a function of quench depth. Homopolymer films and block copolymer films were probed. Such films are nano-scale sensors. The thermal response of these sensor films to e.g. a temperature jump from below LCST (23 °C) to above LCST (45 °C) shows an unexpected behavior, which is related to the chain collapse and water release, relaxation and reswelling. In the proposed experiment we want to deepen this complex kinetic behavior of chain collapse in thin PMDEGA films: We want to investigate the influence of the molecular architecture (star and comb shaped) and of film thickness. 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 15 seconds! Deuterated water (D2O) is used to achieve a high contrast.
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MUELLER BUSCHBAUM Peter; BIESSMANN Lorenz; CUBITT Robert; METWALLI Ezzeldin; PAPADAKIS Christine; PHILIPP Martine and ZHONG Qi. (2014). Impact of chain architecture on the kinetics of chain collapse in thin hydrogel films. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1687
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