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Glass transition and segmental dynamics in thin supported polystyrene films: The role of molecular weight and annealing

AutorYin, Huajie; Cangialosi, Daniele ; Schönhalsa, Andreas
Palabras claveSegmental dynamics
Thin polystyrene films
Glass transition
Fecha de publicación2013
EditorElsevier
CitaciónThermochimica Acta 566: 186-192 (2013)
ResumenBroadband dielectric spectroscopy (BDS), specific heat spectroscopy (HCS) and capacitive scanning dilatometry (CSD) are used to study the glass transition and segmental dynamics in thin supported polystyrene (PS) films. Different molecular weights (Mw = 50 kg/mol, Mw = 260 kg/mol, M w = 1408 kg/mol) and annealing protocols are employed in the study. The segmental dynamics is independent of the film thickness for each M w in the temperature window of the dielectric measurement. The thermal glass transition temperature, Tg, measured by CSD depends on the film thickness and shows also a dependence on Mw. These observations are explained in terms of the formation of irreversibly adsorbed layer due to chain adsorption on the Al substrates during annealing. © 2013 Elsevier B.V. All rights reserved.
URIhttp://hdl.handle.net/10261/102571
DOI10.1016/j.tca.2013.05.034
Identificadoresdoi: 10.1016/j.tca.2013.05.034
issn: 0040-6031
e-issn: 1872-762X
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