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Stratification and Two Glass-Like Thermal Transitions in Aged Polymer Films

Abstract

Using x-ray reflectivity, spectroscopic ellipsometry and Raman spectroscopy, we have studied the stratified structure and the two glass-like thermal transitions in sufficiently aged glassy polystyrene (PS) films. We find that favorable interaction between the solid substrate and the polymer film induces stratification within the film resulting in different densities across the film thickness. Existence of two glass-like thermal transitions (one at 70 °C and the other at 95 °C) are independently confirmed by temperature dependent spectroscopic ellipsometry and Raman spectroscopy measurements. Interestingly, the thermal coefficient of expansion of the polymer film displays anomalous behavior with temperature and is found to have the lowest value over the temperature range 70 - 95 °C i.e. between the two observed glass-like thermal transition temperatures.

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Publication details

The article was received on 22 Aug 2017, accepted on 10 Oct 2017 and first published on 10 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP05726A
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Stratification and Two Glass-Like Thermal Transitions in Aged Polymer Films

    L. Pradipkanti, M. Chowdhury and D. K. Satapathy, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP05726A

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