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Chemical improvement of surfaces. Part 2: Permanent hydrophobization of wood by covalently bonded fluoroorganyl substituents
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Martin H.H. Drafz
Published/Copyright:
February 29, 2012
Abstract
A recently developed esterification method in our laboratory was applied to permanent hydrophobization of wood surfaces. Specifically, the covalent attachment of fluoroorganyl substituents to wood hydroxy groups via benzotriazolyl-activated, substituted benzoic acids was in focus. Weight percent gain values from 10% to 28% were obtained on Scots pine (Pinus sylvestris) sapwood veneer chips. It proved feasible to lower the temperature for wood modification from 150°C to 120°C, or even to 70°C so that thermal decomposition of wood during modification can be neglected. The modified chips were analyzed by attenuated total reflection – infrared and X-ray photoelectron spectroscopy. Covalent attachment of the fluorobenzoic acids led to a very high, permanent hydrophobicity of the wood surface, documented by outstanding contact angles of up to 143°.
Keywords: attenuated total reflection IR (ATR-IR); contact angle (CA); covalent fixation; esterification; fluorine; hydrophobation of wood surface; X-ray photoelectron spectroscopy (XPS)
Received: 2011-10-25
Accepted: 2012-1-30
Published Online: 2012-02-29
Published in Print: 2012-08-01
©2012 by Walter de Gruyter Berlin Boston
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Articles in the same Issue
- Masthead
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- Original Papers
- Anthraquinone polymer catalysts for alkaline delignification of lignocellulosic matter. Part 1. Syntheses and characterizations
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