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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 12 — Apr. 20, 2014
  • pp: 2702–2710

Spectroscopic diagnostics of morphological changes arising in thermal processing of polypropylene

Donia Hakoume, Leonid A. Dombrovsky, Didier Delaunay, and Benoit Rousseau  »View Author Affiliations

Applied Optics, Vol. 53, Issue 12, pp. 2702-2710 (2014)

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Polypropylene is considered as a representative thermoplastic matrix for advanced composite materials that have some advantages in various engineering applications. Wide-range infrared optical properties of polypropylene are important for combined heat transfer modeling in these composite materials, which are semitransparent in a considerable part of the whole spectral range. This study is focused on optical properties of polypropylene in the visible and near-infrared ranges because the measurements in these ranges exhibit a stronger effect of the processing temperature used in the material manufacturing. The experimental study is based on spectral measurements of both the normal-hemispherical reflectance and transmittance of polypropylene samples. The main characteristics of volumetric absorption and scattering are identified using the inverse problem solution based on the modified two-flux approximation, which is sufficiently accurate to determine the hemispherical characteristics of the radiation field in the range of the problem parameters. In particular, the effect of a relatively strong scattering is observed at the absorption peaks in the near-infrared range. An approximate theoretical model based on spectroscopic data is developed to estimate morphological changes arising in thermal processing of polypropylene at different temperatures.

© 2014 Optical Society of America

OCIS Codes
(160.5470) Materials : Polymers
(290.4020) Scattering : Mie theory

ToC Category:
Thin Films

Original Manuscript: December 5, 2013
Revised Manuscript: March 21, 2014
Manuscript Accepted: March 24, 2014
Published: April 18, 2014

Virtual Issues
Vol. 9, Iss. 6 Virtual Journal for Biomedical Optics

Donia Hakoume, Leonid A. Dombrovsky, Didier Delaunay, and Benoit Rousseau, "Spectroscopic diagnostics of morphological changes arising in thermal processing of polypropylene," Appl. Opt. 53, 2702-2710 (2014)

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