Long range concentration gradients at the free surface of polymer films swollen by carbon dioxide

Xinxin Li, Bryan Vogt

Research output: Contribution to journalArticle

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Abstract

The local swelling through the thickness of a polymer film induced by exposure to carbon dioxide is assessed using in situ selective modification of a swollen amphiphilic polymer template. The swollen film is selectively modified by condensation of tetraethylorthosilicate within the hydrophilic domains. Monitoring the size of pores resulting from the unmodified hydrophobic domains provides a measure of the local CO 2 concentration within the film. A maximum in the average pore size is obtained near the density fluctuation ridge with a gradient in pore size extending approximately 150 nm into the film from, the free surface and a short (< 10 nm) gradient at the buried interface. Far from this maximum, the pore size through the thickness of the film is uniform.

Original languageEnglish (US)
Pages (from-to)9306-9311
Number of pages6
JournalMacromolecules
Volume41
Issue number23
DOIs
Publication statusPublished - Dec 9 2008

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All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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