Reference : End-grained wood-polyurethane composites, 1 Synthesis, morphology and characterization
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Physical, chemical, mathematical & earth Sciences : Physics
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/126465
End-grained wood-polyurethane composites, 1 Synthesis, morphology and characterization
English
Persenaire, Olivier [Université de Mons-Hainaut - UMH > > Laboratory of Polymeric and Composite Materials (LPCM) > >]
Alexandre, Michaël mailto [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 - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Dubois, Philippe [Université de Mons-Hainaut - UMH > > Laboratory of Polymeric and Composite Materials (LPCM) > >]
20-Oct-2004
Macromolecular Materials and Engineering
Wiley-V C H Verlag Gmbh
289
10
895-902
Yes (verified by ORBi)
International
1438-7492
Weinheim
[en] composites ; end-grained wood ; impregnation ; morphology ; polyurethanes
[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.
Researchers
http://hdl.handle.net/2268/126465
10.1002/mame.200400113

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