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In situ Foaming Evolution of Flexible Polyurethane Foam Nanocomposites

✍ Scribed by M. Mar Bernal; Miguel Angel Lopez-Manchado; Raquel Verdejo

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
860 KB
Volume
212
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

The effect of both as‐produced and functionalised CNTs on the polymerisation evolution of water‐blown PU foams containing up to 0.3 wt.‐% CNTs was studied by in situ FT‐IR spectroscopy. FT‐IR revealed a decrease on the rate of isocyanate conversion as a function of loading fraction for both as‐grown and oxidised CNTs. This dependency suggested that the isocyanate conversion at the early stages of the reaction was governed by the kinetic effects imposed by the presence of the CNTs. The onset of microphase separation was accelerated by the addition of functionalised CNTs (f‐CNTs) but not by as‐produced CNTs due to the different surface functionalities. Measurements of the foaming viscoelastic properties showed an increase on the storage modulus with the CNT content, which indicated the reinforcement of the foam. magnified image

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