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Characterization of hyperporous polyurethane-based gels by non intrusive mercury porosimetry

Abstract : Evaporative drying of polyurethane-based gels produces xerogels. Supercritical drying after replacement of interstitial liquid by supercritical CO2 produces aerogels. SEM micrographs show that both materials are made up of small size particles gathered up in filament-shaped, strongly cross-linked aggregates. Density measurements show that they both have a large pore volume. When submitted to mercury porosimetry, the behavior of these materials is similar to that of inorganic aerogels, as previously observed. Mercury does not penetrate the pore network, but the whole material is densified. The usual Washburn equation cannot be used to analyze the mercury porosimetry. A well-suited equation based on a buckling model of filament-shaped aggregates has been developed in order to determine the pore volume distribution of mineral dried gels. This equation is also valid for analyzing the texture of organic hyperporous materials like polyurethane dried nanoporous gel. © 2003 Elsevier Science Ltd. All rights reserved.
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Soumis le : mardi 26 octobre 2010 - 14:17:42
Dernière modification le : jeudi 24 septembre 2020 - 17:22:03



R. Pirard, Arnaud Rigacci, J.C. Maréchal, D. Quenard, B. Chevalier, et al.. Characterization of hyperporous polyurethane-based gels by non intrusive mercury porosimetry. Polymer, Elsevier, 2003, 44 (17), p.4881-4887. ⟨10.1016/S0032-3861(03)00481-6⟩. ⟨hal-00529725⟩



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