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Theses

Modification de l’énergie de surface du bois par fluoration

Abstract : The availability, the ecological and economic characteristics of wood are advantages which explain the very wide scope of applications of this material in several domains such as the paper industry, furniture, carpentry and construction. However, wood is a hygroscopic material, highly sensitive to ambient humidity and temperature. The swelling and the shrinking caused by water adsorption and desorption cycles lead to cracking and deformation in the wood volume, making it incompatible for some applications.In this study an original surface treatment was applied to wood samples (douglas and silver fir species) to decrease their hydrophilic character: direct fluorination using F2 gas. The covalent grafting of fluorine atoms onto extreme wood surfaces through a conversion of C-OH groups into C-F was evidenced by Fourier-Transform infrared spectroscopy and 19F solid state Nuclear Magnetic Resonance.The wood which is initially hydrophilic acquires a hydrophobic character comparable to that of Teflon, thanks to fluorination. Good durability of this treatment under ambient atmosphere and UV irradiation was also highlighted. Moreover, because it affects only the extreme surface, this treatment allowed us to obtain a hydrophobic character without major structural (morphology, density and colour) or mechanical changes. The maintaining of these properties after fluorination appears to be a remarkable advantage over other traditional physical and chemical wood treatments.
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Submitted on : Tuesday, June 26, 2018 - 2:39:05 PM
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2017CLFAC086_POUZET.pdf
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  • HAL Id : tel-01823794, version 1

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Martial Pouzet. Modification de l’énergie de surface du bois par fluoration. Matériaux. Université Clermont Auvergne, 2017. Français. ⟨NNT : 2017CLFAC086⟩. ⟨tel-01823794⟩

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