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Optical expandometry: A technique to analyze the expansion kinetics of chemically blown thermoplastic foams
Author(s) -
Solórzano Eusebio,
Antunes Marcelo,
SaizArroyo Cristina,
RodríguezPérez Miguel A.,
Velasco José I.,
de Saja José A.
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.34306
Subject(s) - polyolefin , materials science , thermoplastic , composite material , blowing agent , rheology , expansion ratio , kinetics , polymer , anisotropy , thermoplastic elastomer , work (physics) , polyurethane , mechanical engineering , optics , copolymer , physics , layer (electronics) , quantum mechanics , engineering
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 polyolefin‐based 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. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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