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  Refractive index and swelling of thin PMMA films in CO2/MMA mixtures at elevated pressures

Fehrenbacher, U., Jakob, T., Berger, T., Knoll, W., & Ballauff, M. (2002). Refractive index and swelling of thin PMMA films in CO2/MMA mixtures at elevated pressures. Fluid Phase Equilibria, 200(1), 147-160.

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 Creators:
Fehrenbacher, U., Author
Jakob, T.1, Author           
Berger, T., Author
Knoll, Wolfgang1, Author           
Ballauff, M.1, Author           
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

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Free keywords: waveguide spectroscopy; supercritical CO2; PMMA; MMA; refractive index; swelling
 Abstract: Waveguide spectroscopy has been applied to optically study the influence of the concentration (0-1.5 M) of methylmethacrylate (MMA) in supercritical CO2 on the refractive index and swelling of PMMA as a function of pressure (up to 52 MPa at 333 K). The refractive index of pure CO2 is compared to literature in order to validate the technique in a supercritical fluid environment. The MMA content was varied, which resulted in an increased refractive index of the fluid in conjunction with a decreased refractive index of the PMMA film. This behavior is a direct result of a larger sorption and therefore swelling of the polymer layer and was measured at different pressures. With increasing pressure an increase of the refractive index of the solution and a decrease of the one of the PMMA layer was observed. The obtained refractive indices were modeled assuming an ideal mixture. The comparison with the experimental results showed that the qualitative behavior agrees well with the calculations. (C) 2002 Elsevier Science B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2002-07-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: eDoc: 28678
ISI: 000176886500012
Other: P-02-95
 Degree: -

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Title: Fluid Phase Equilibria
  Alternative Title : Fluid Phase Equilib.
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 200 (1) Sequence Number: - Start / End Page: 147 - 160 Identifier: ISSN: 0378-3812