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Published on: January 26, 2016
Deviations of the glass transition temperature in amorphous conjugated polymer thin films
Dan Liu1, Rodrigo Osuna Orozco, Tao Wang
1School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, United Kingdom.
Abstract:
The deviations of the glass transition temperature (T(g)) in thin films of an amorphous conjugated polymer poly(9,9-dioctylfluorene-co-N-(4-butylphenyl)diphenylamine) (TFB) are reported. Monotonic and nonmonotonic T(g) deviations are observed in TFB thin films supported on Si-SiOx and poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS), respectively. A three-layer model is developed to fit both monotonic and nonmonotonic T(g) deviations in these films. A 5-nm PEDOT:PSS capping layer was not found to be effective to remove the free-surface effect in Si-SiOx supported TFB films.
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