Free volume expansion and nanofoaming of supercritical carbon dioxide treated polystyrene

Toshitaka Oka, Kenji Ito, Chunqing He, Cedric Dutriez, Hideaki Yokoyama, Yoshinori Kobayashi

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Free volume of polystyrene films treated with supercritical carbon dioxide (SCCO2) were examined by positron annihilation lifetime spectroscopy. Variation of the free volume sizes after the SCCO2 treatment due to the release of trapped CO2 and structural relaxation of the polymer was observed. After 500 h from the depressurization, the free volume of the treated films free from CO2 was ∼0.306 nm in radius and much larger than that of the untreated films of ∼0.295 nm in radius due to the freezing of the swollen structure caused by the large solubility of CO 2.

Original languageEnglish
Pages (from-to)12191-12194
Number of pages4
JournalJournal of Physical Chemistry B
Volume112
Issue number39
DOIs
Publication statusPublished - 2008 Oct 2
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Free volume expansion and nanofoaming of supercritical carbon dioxide treated polystyrene'. Together they form a unique fingerprint.

  • Cite this

    Oka, T., Ito, K., He, C., Dutriez, C., Yokoyama, H., & Kobayashi, Y. (2008). Free volume expansion and nanofoaming of supercritical carbon dioxide treated polystyrene. Journal of Physical Chemistry B, 112(39), 12191-12194. https://doi.org/10.1021/jp802188p