Non-coherent video-reflectometry of growing pores in plasticized polymers during supercritical fluidic foaming
A method of non-coherent video-reflectometry based on acquisition and analysis of image sequences in the back-reflection mode under white light illumination is examined for application to characterization of the nucleation stage in plasticized bioresorbable polymer (polylactide) foamed under pressure quenching in the “polylactide – supercritical/subcritical carbon dioxide” system. Features of image formation are discussed for the cases of the formation and growth of the surface and bulk pores in the plasticized polymer. Expansion of the video-reflectometric technique for the case of coherent illumination (the full-field speckle-correlometric technique) is considered.
Yury Gagarin State Technical University of Saratov, 77 Polytechnicheskaya st., Saratov, 410054, Russia
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