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A novel technique to determine in situ the
free expansion kinetics of chemically foamed thermoplastic
foams, so-called optical expandometry, is presented
in this work. This technique is based on the
camera monitoring of a free-foaming material placed
inside a furnace. Images are acquired under special illumination
conditions to facilitate the later image processing.
The present article explains the experimental set-up
and the image processing methods used to determine
the free volumetric expansion of different polyolefinbased foams. The results are compared with those
obtained using thermo-mechanical analysis. In addition,
several possible applications of this method are detailed,
such as studying the effect of polymer rheology, foaming
temperature, blowing agent content and the anisotropy
of the expansion.
CitationSolórzano, E. [et al.]. Optical expandometry: a technique to analyze the expansion kinetics of chemically blown thermoplastic foams. "Journal of applied polymer science", Juliol 2012, vol. 125, núm. 2, p. 1059-1067.
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