ORGANIC MATERIALS PHYSICS LAB
Structure and dynamics of confined polymer melts are different from those of the unconstrained bulk. Over the decades, a number of groups have performed dynamics of polymer thin films on solid substrates using various experimental techniques. However, for these single side-confinement systems, it is difficult to determine the reason of the overall dynamics change of confined polymers due to the different behaviors of polymers between the free surface and the polymer-substrate interface. Our group investigates the interdiffusion dynamics of polymer melts confined with two parallel graphene oxide (GO) surfaces using a neutron reflectivity (NR) technique. Furthermore, at the immiscible polymer blend system, dewetting dynamics are occurred at above glass transition temperature (Tg) to reduce their effective contact area between them. Via NR, their interfacial changes during the initial process of dewetting can be observed in order to clarify the main reason of dewetting, specifically. Moreover, self-assembled structure of block co-polymer can be measured even at the middle of polymer layer.