Article (Scientific journals)
Characterization of hyperporous polyurethane-based gels by non-intrusive mercury porosimetry
Pirard, René; Rigacci, Arnaud; Marechal, Jacqueline et al.
2003In Polymer, 44 (17), p. 4881-4887
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Keywords :
porous texture; mercury porosimetry; dried gels
Abstract :
[en] 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. (C) 2003 Elsevier Science Ltd. All rights reserved.
Disciplines :
Chemical engineering
Materials science & engineering
Author, co-author :
Pirard, René ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Rigacci, Arnaud
Marechal, Jacqueline ;  Centre Hospitalier Universitaire de Liège - CHU > Secteur prélèvements sanguins
Quenard, D.
Chevalier, B.
Achard, Patrick
Pirard, Jean-Paul ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Language :
English
Title :
Characterization of hyperporous polyurethane-based gels by non-intrusive mercury porosimetry
Publication date :
2003
Journal title :
Polymer
ISSN :
0032-3861
eISSN :
1873-2291
Publisher :
Elsevier Science, Oxford, United Kingdom
Volume :
44
Issue :
17
Pages :
4881-4887
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 August 2009

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