Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 60: Polymer and Molecular Dynamics I
CPP 60.2: Vortrag
Mittwoch, 14. März 2018, 17:15–17:30, C 264
First Clear-cut Experimental Evidence for A Glass Transition in Polymers of Intrinsic Microporosity (PIMs) — •Huajie Yin1, Yeong Zen Chua2, Bin Yang2, Christoph Schick2, Martin Böhning1, and Andreas Schönhals1 — 1Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany — 2University of Rostock, Institute of Physics and Competence Center CALOR, Albert-Einstein-Str. 23-24, 18059 Rostock, Germany
Polymers with intrinsic microporosity (PIMs) represent a novel innovative class of materials with great potential in several applications from high-performance gas separation membranes to electronic devices. Microporosity with BET surface areas > 700 m2/g is due to their rigid structure resulting in limited molecular mobility. Up to now no glass transition temperature (Tg) could be detected before degradation. Therefore, it is important to clarify whether PIMs undergo a glass transition. Decoupling the time scales responsible for the glass transition and decomposition is a reliable strategy. This was achieved by employing fast scanning calorimetry (FSC) based on a chip sensor, which is capable to heat and cool a small amount of sample with extremely high heating/cooling rate of many thousands of Kelvin per second. For the first time, Tg values of two archetypal representatives of PIMs: PIM-1 and PIM-EA-TB were determined. FSC provides clear-cut experimental evidence of the glass transition of PIM-1 with a Tg of 442 °C and PIM-EA-TB with a Tg of 404 °C at a heating rate of 30,000 K/s.