Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.32: Poster
Montag, 1. April 2019, 17:30–19:30, Poster B1
Tunable surprising glassy dynamics in MAPLE deposited nanostructured polymer — •Mithun Chowdhury1, Xavier Monnier2, Yucheng Wang3, Daniele Cangialosi2, and Rodney Priestley3 — 1Metallurgical Engineering and Materials Science, IIT Bombay, Mumbai 400076, India — 2Centro de Fisica de Materiales, CSIC-UPV/EHU, San Sebastian 20018, Spain — 3Chemical and Biological Engineering, Princeton University, NJ 08544, USA
In this study we characterize glassy dynamics of Matrix Assisted Pulsed Laser Evaporation (MAPLE) deposited poly (methyl methacrylate) (PMMA) films. For that, we exploit fast scanning calorimetry to investigate the molecular mobility and the vitrification kinetics in terms of the thermodynamic state attained after a given cooling rate. We found in general any MAPLE deposited glass is thermodynamically more stable than bulk polymer standard glass, as indicated by lower fictive temperature in comparison to standard glass. Intriguingly, MAPLE deposited glasses exhibits at the same time faster molecular mobility. For a standard glass, the opposite behavior is generally found. Furthermore, by heating (aging and annealing) and controlling MAPLE deposition temperature, the amorphous state can be tuned. This still significantly deviates from the standard PMMA. We tentatively conclude that MAPLE deposited glasses are formed following a distinguished kinetic path, leading to an amorphous state well different from that of glasses formed in the conventional way, that is, by cooling through its glass transition temperature from melt.