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Proceedings Paper

Light scattering methods and characterization of polymer systems and processes
Author(s): Jaroslav Holoubek
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Paper Abstract

Various light scattering and optical techniques have been investigated as potential candidates for characterization of multiphase polymeric materials. The Mueller matrix formalism is briefly mentioned as an effective procedure of complete optical description of the medium. The effects of multiple and dependent scattering as well as coherent and diffuse light attenuation are discussed in model calculations and corresponding experiments (small-angle light scattering, time-resolved light scattering, transmission or diffuse reflectance measurements and image analysis). The following physical processes has been investigated: kinetics of phase separation and dissolution (demixing) of polymer blends, stress whitening process and photon migration in polymer composites. Light scattering and the diffuse reflectance method were used to characterize heterogeneous structures of polypropylene-based materials before and after solid-state deformation. The application of a hybrid model of Monte Carlo simulation and diffusion theory recently developed to describe propagation of photons into sufficient depth in the turbid media is presented for polypropylene samples with various amounts of ethylene-propylene rubber particles. The value of reduced scattering coefficient determined from experiment is an important structural parameter with direct relationship to size of particles and their volume fraction in the polymer matrix. Since speckles play an important role in many physical phenomena, it is essential to fully understand their properties. Structural aspects of the laser speckle techniques and their application in polymer physics are presented.

Paper Details

Date Published: 4 March 1999
PDF: 12 pages
Proc. SPIE 3726, Saratov Fall Meeting '98: Light Scattering Technologies for Mechanics, Biomedicine, and Material Science, (4 March 1999); doi: 10.1117/12.341426
Show Author Affiliations
Jaroslav Holoubek, Institute of Macromolecular Chemistry (Czech Republic)

Published in SPIE Proceedings Vol. 3726:
Saratov Fall Meeting '98: Light Scattering Technologies for Mechanics, Biomedicine, and Material Science
Valery V. Tuchin; Vladimir P. Ryabukho; Dmitry A. Zimnyakov, Editor(s)

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