Optical determination of molecule diffusion coefficients in polymer films

DOI PDF 被引用文献3件
  • R. P. Podgorsek
    Applied Physics Laboratory, Gerhard-Mercator University of Duisburg, D-47048 Duisburg, Germany
  • H. Franke
    Applied Physics Laboratory, Gerhard-Mercator University of Duisburg, D-47048 Duisburg, Germany

書誌事項

公開日
1998-11-16
DOI
  • 10.1063/1.122619
公開者
AIP Publishing

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説明

<jats:p>We present a method using surface-plasmon leaky mode spectroscopy for the analysis of the vapor–molecule diffusion process in polymer films leading to the diffusion coefficients of the molecules. The solution of the diffusion differential equation in the case of thin films yields a molecule concentration profile. Linearity between refractive index increase and molecule concentration gives the same variation for the index increase. Thus, a theoretical expression for the measured reflectivity can be derived using the transfer-matrix formalism for layered media, and theoretical fits to measured reflectivity data finally yield the corresponding diffusion coefficients. For the polymer Teflon®AF1600 diffusion coefficients for benzene and toluene are determined to 4.9×10−10 and 2.7×10−10 cm2/s, respectively.</jats:p>

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