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Solution filtering affects the glassy dynamics of spincoated thin films of poly(4-chlorostyrene)

  • Alice Debot
  • Pragya Tripathi
  • Simone NapolitanoEmail author
Regular Article
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Part of the following topical collections:
  1. Dielectric Spectroscopy Applied to Soft Matter

Abstract.

We investigated the impact of sample preparation on the glassy dynamics of thin films of poly(4-chlorostyrene), a polymer whose molecular mobility is particularly sensitive to changes in the specific volume. Samples were obtained by spincoating, the technique most commonly used to prepare thin organic layers, which consists of pouring dilute polymer solutions onto a plate rotating at a high rate. Our experimental results demonstrate that filtering the solutions before spincoating affects the value of the segmental relaxation time of the as-prepared films. Thin polymer layers obtained via filtered solutions show accelerated segmental dynamics upon confinement at the nanoscale level, once below 100nm, while the samples obtained via unfiltered solutions exhibit bulk-like dynamics down to 15-20nm. We analyzed these results by means of the cooperative free volume rate model, considering a larger free volume content in thin films obtained via filtered solutions. The validity of the model predictions was finally verified by measurements of irreversible adsorption, confirming a larger adsorbed amount, corresponding to a higher specific volume, in the case of samples obtained via unfiltered solutions. Our results prove that filtering is a crucial step in the preparation of thin films, and it could be used to switch on and off nanoconfinement effects.

Graphical abstract

Keywords

Topical issue: Dielectric Spectroscopy Applied to Soft Matter 

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Copyright information

© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Alice Debot
    • 1
  • Pragya Tripathi
    • 1
  • Simone Napolitano
    • 1
    Email author
  1. 1.Polymer and Soft Matter Dynamics, Experimental Soft Matter and Thermal Physics (EST), Faculté des SciencesUniversité libre de Bruxelles (ULB)BrusselsBelgium

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