NDLI: Wood surfaces protected with transparent multilayer UV-cured coatings reinforced with nanosilica and nanoclay. Part I: morphological study and effect of relative humidity on adhesion strength

Content Provider	Springer Nature Link
Author	Nkeuwa, William Nguegang Riedl, Bernard Landry, Véronic
Copyright Year	2014
Abstract	Multilayer coatings that are used to protect surfaces of wood components constituting ready to assemble furniture must have good adhesion to the substrate, particularly for wood furniture used in high humidity environments like bathrooms. It is not known whether adding nanoparticles to such coatings will change their properties. Surfaces of yellow birch wood (Betula alleghaniensis Britton) were protected with six different types of multilayer coatings (MCs). Prepared primer and topcoat UV-curable formulations constituting these MCs contained, respectively, hydrophobic-fumed silica (NS) and nanoclays (NC). They were added at 0 and 0.5 wt% for NS and at 0, 1, and 3 wt% for NC. The viscosity behavior of these formulations was evaluated as a function of shear rate. The morphology of the cross-section of coated wood samples was qualitatively studied by means of both scanning and transmission electron microscopy (SEM and TEM analysis). The adhesion strength of these MCs on wood surfaces was assessed as a function of relative humidity (RH). TEM images have revealed that topcoats reinforced with NC appear to have an intercalated (micro and nanoparticles) morphology. Statistical results have shown that NS and NS × NC do not significantly confer additional adhesion strength of MCs on wood surfaces, whereas the effect of NC is significant. The adhesion strength of coated wood samples conditioned at 80% RH was higher than that obtained on those conditioned at 40% RH. Multilayer coating # 5 ([0.5 wt% NS—1 wt% NC] combination) has been chosen as the ideal protection system for two reasons: (i) high adhesion strength at low RH and (ii) good barrier properties.
Starting Page	283
Ending Page	301
Page Count	19
File Format	PDF
ISSN	15470091
Journal	JCT Research
Volume Number	11
Issue Number	3
e-ISSN	19353804
Language	English
Publisher	Springer US
Publisher Date	2014-02-21
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Wood UV cure Multilayer coatings Nanoparticles Adhesion Relative humidity Tribology, Corrosion and Coatings Surfaces and Interfaces, Thin Films Polymer Sciences Industrial Chemistry/Chemical Engineering Materials Science
Content Type	Text
Resource Type	Article
Subject	Chemistry Surfaces, Coatings and Films Colloid and Surface Chemistry Surfaces and Interfaces

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