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Regensburg 2002 – scientific programme

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SYME: Mechanical Properties of Thin Films

SYME 1: Elastic Properties

SYME 1.2: Talk

Monday, March 11, 2002, 16:00–16:15, H 31

Mechanical Spectroscopy of Thin PPV Films — •Attila Nagy1, Alexander Strahl1, Hartmut Neuhäuser1, and Sigurd Schrader21Institut für Metallphysik und Nukleare Festkörperphysik, Technische Universität Braunschweig — 2Institut für Physik, Lehrstuhl Physik Kondensierter Materie, Universität Potsdam

Thin layer of PPV (poly-p-phenylenevinylene) have been by means of spin-coating deposited on Si substrate cantilevers. In a vibrating reed apparatus (electrostatical excitation and otical detection) the temperature dependence of vibration frequency and internal friction of the composite have been measured in order to study the elastic modulus and relaxation phenomena of the polymer layer during temperature cycling programs between 90 K and 570 K. Particularly, evaluating the temperature and frequency dependence, the typical relaxations before and after polymerisation have been examined. In addition irreversible processes in the film are observed during polymerisation. The results are compared with data from DSC and DTA measurements. This work was supported by the Graduiertenkolleg No-dqMetrologie in Physik und TechnikNo-dq of the TU Braunschweig and the PTB Braunschweig through the DFG.

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