Glass transition at the polystyrene/polyethylene glycol interface observed via contact angle measurements View Full Text


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Article Info

DATE

2019-05

AUTHORS

Takashi Sasaki, Kazuaki Hiraki, Aizzahtul Athirah, Kodai Matsuta, Natsuki Takeuchi

ABSTRACT

We investigated the possibility of detecting the interfacial glass transition of a polymer with static contact angle measurements of a liquid polyethylene glycol on the polymer surface. The observed contact angle θ reflects the deviation from an equilibrium state at low temperatures, and the temperature dependence of cos θ changes discontinuously at the interfacial glass transition temperature Tg, manifesting a change in the interfacial entropy. This outcome was demonstrated experimentally for a liquid of polyethylene glycol (PEG) on an atactic polystyrene (PS) surface. The evaluated Tg was ca. 362 K. This value is lower than a calorimetric Tg for a bulk PS. This difference reflects molecular interactions at the interface, indicating that the Tg obtained from the contact angle measurement is sensitive to the dynamics near the polymer/liquid interface. The possibility of detecting the interfacial glass transition of polystyrene with contact angle measurements of a liquid polyethylene glycol on the polymer surface was investigated. The observed contact angle reflects the deviation from an equilibrium state at low temperatures, exhibiting a discontinuous change in the temperature dependence of the interfacial tension. The evaluated Tg was ca. 362 K, which is lower than a calorimetric Tg for a bulk polystyrene. The interfacial glass transition appears to be detected when the polymer/liquid interactions affect the wetting process. More... »

PAGES

1-8

Journal

TITLE

Polymer Journal

ISSUE

5

VOLUME

51

Author Affiliations

From Grant

  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1038/s41428-018-0163-2

    DOI

    http://dx.doi.org/10.1038/s41428-018-0163-2

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1111260023


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