Skip to Main content Skip to Navigation
Journal articles

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.
Document type :
Journal articles
Complete list of metadata
Contributor : Magalie Prudon Connect in order to contact the contributor
Submitted on : Tuesday, October 26, 2010 - 2:17:42 PM
Last modification on : Tuesday, June 7, 2022 - 2:56:01 PM

Links full text



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⟩



Record views