Advertisement

The European Physical Journal Special Topics

, Volume 166, Issue 1, pp 103–106 | Cite as

Diffusion in multi-component polymeric systems: Diffusion of non-volatile species in thin films

Regular Article

Abstract

Polymeric films for high-tech products like LCD-panels, transdermal patches or medical test strips typically consist of a polymer and one or more non-volatile additives. If during the production process a multi-component solution is coated and subsequently dried, the diffusion of solvents and non-volatile species in the polymeric systems plays an important role. Recent experiments revealed that the drying conditions can have a significant influence on the formation of inhomogeneous distribution of the non-volatile components in the final foil and therefore affects desired product properties. The distribution of the non-volatile components in the final film has an important impact on the physical and chemical properties, including mechanical and optical properties, wetting behavior or drug release rates i.e. the product quality of the polymeric system. To be able to describe the diffusion of non-volatile species in a multi-component polymeric system during drying correctly, reliable information about the influence of the solvent concentration on the mobility of the additive are essential. To obtain information about the mobility of the additive in the polymeric solution new experiments were performed and observed by means of Inverse-Micro-Raman-Spectroscopy (IMRS). By fitting simulated concentration profiles to the experimental data, the temperature and concentration dependent diffusion coefficient of the non-volatile additive in the polymer solution was determined. The investigations are part of a bilateral funding of NFG in the US and DFG in Germany. Diffusion of volatile species in multicomponent polymeric systems are investigated by the group of Richard Cairncross.

Keywords

Polymeric Solution EUROPEAN Physical Journal Special Topic PVAc Water Vapor Transmission Rate MeCl 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. W. Schabel, P. Scharfer, M. Müller, I. Ludwig, M. Kind, Chem. Ing. Tech. 75, 9 (2003) Google Scholar
  2. B. Scharder, Infrared and Raman Spectroscopy: Methods and Application (Weinheim, 1995) Google Scholar
  3. J.S. Vrentas, J.L. Duda, J. Polym. Sci. 15, 403 (1977) Google Scholar
  4. E.B. Gutoff, J. Im. Sci. Tech. 38, 2 (1994) Google Scholar
  5. VDI-Wärmeatlas, 9. Auflage (VDI-Verlag, Düsseldorf, 2002) Google Scholar

Copyright information

© EDP Sciences and Springer 2009

Authors and Affiliations

  • M. Müller
    • 1
  • M. Kind
    • 1
  • R. Cairncross
    • 2
  • W. Schabel
    • 1
  1. 1.Institute for Thermal Process Engineering, Karlsruhe Institute of Technology (KIT)KarlsruheGermany
  2. 2.Department of Chemical and Biological EngineeringUniversityPhiladelphiaUSA

Personalised recommendations