Article (Scientific journals)
End-grained wood-polyurethane composites, 1 Synthesis, morphology and characterization
Persenaire, Olivier; Alexandre, Michaël; Degée, Philippe et al.
2004In Macromolecular Materials and Engineering, 289 (10), p. 895-902
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Keywords :
composites; end-grained wood; impregnation; morphology; polyurethanes
Abstract :
[en] In order to improve the dimensional stability of end-grained wood upon environmental humidity variations, a two-step procedure was thoroughly Studied which involved the osmotic impregnation of native poplar wood by PEG, followed by the reactive impregnation with HMDI, leading to polymer chain extension and polyurethane formation. It came out that the efficiency of PEG and/or polyurethane grafting within ligno-cellulosic cell walls was intimately related to parameters such as concentration of the PEG impregnation bath, PEG molar mass, time and temperature of impregnation steps. Based on the different sample characterizations, Soxhlet extraction and density measurements, it came out that adequate experimental conditions are to carry out osmotic impreanation at 20degreesC for 24 h starting from an aqueous solution of PEG([PEG] = 0.5mol(.)L(-1) and (M) over bar (nPEG) = 400 or 1000) and reactive impregnation in bulk with a large excess of HMDI at 20degreesC for 2 h. Combining scanning electron microscopy and mercury porosimetry demonstrated the selective impregnation of cell wall and wood rays which were collapsed in native wood and expanded in wood polyurethane composites.
Disciplines :
Chemistry
Materials science & engineering
Physics
Author, co-author :
Persenaire, Olivier;  Université de Mons-Hainaut - UMH > Laboratory of Polymeric and Composite Materials (LPCM)
Alexandre, Michaël ;  Université de Mons-Hainaut - UMH > Laboratory of Polymeric and Composite Materials (LPCM)
Degée, Philippe;  Université de Mons-Hainaut - UMH > Laboratory of Polymeric and Composite Materials (LPCM)
Pirard, René ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Dubois, Philippe;  Université de Mons-Hainaut - UMH > Laboratory of Polymeric and Composite Materials (LPCM)
Language :
English
Title :
End-grained wood-polyurethane composites, 1 Synthesis, morphology and characterization
Publication date :
20 October 2004
Journal title :
Macromolecular Materials and Engineering
ISSN :
1438-7492
eISSN :
1439-2054
Publisher :
Wiley-V C H Verlag Gmbh, Weinheim, Germany
Volume :
289
Issue :
10
Pages :
895-902
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 28 June 2012

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