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首页> 外文期刊>Journal of Applied Polymer Science >Surface chemistry and moisture sorption properties of wood coated with multifunctional alkoxysilanes by sol-gel process
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Surface chemistry and moisture sorption properties of wood coated with multifunctional alkoxysilanes by sol-gel process

机译：用溶胶 - 凝胶工艺用多功能烷氧基硅烷涂覆木材的表面化学和水分吸附性能

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Sol-gel surface deposition of a hydrophobic polysiloxane coating on wood was accomplished by using a mixture of a low molecular weight multifunctional alkoxysilane, methyltrimethoxysilane (MTMOS), and a high molecular weight multifunctional alkoxysilane, hexadecyltrimethoxysilane (HDTMOS). Investigation of the surface chemistry and morphology of the wood specimens by means of ATR-FTIR, energy-dispersive X-ray analysis, X-ray photoelectron spectroscopy, SEM, and atomic force microscopy indicated that the sol-gel process results in deposition of polysiloxane networks that are bonded to the wood by polycondensation with surface hydroxyl groups. The surface hydroxyl groups involved in the bonds appear to be located predominantly on the cellulose component of the wood. The sol-gel deposit on the wood substrates lowered the rates of water and water vapor sorption. The low molecular weight MTMOS apparently penetrated the outer surface layers of the wood and condensed with hydroxyls that may not be readily accessible to the high molecular weight HDTMOS. Once attached to such sites, it is reasonable to assume that some of these surface derivatives of MTMOS condensed with other molecules of MTMOS and HDTMOS with a long hydrocarbon chain to form a polysiloxane network that is hydrophobic. The ultimate effect of the sol-gel deposit can therefore be regarded as not only to decrease the surface concentration of hydrogen-bonding sites, but also to stereochemically hinder the formation of hydrogen bonds between such sites and water molecules. (C) 2003 Wiley Periodicals, Inc. [References: 24]
机译：通过使用低分子量多官能烷氧基硅烷，甲基三甲氧基硅烷（MTMOS）和高分子量多官能烷氧基氧硅烷，十六烷基三甲氧基硅烷（HDTMOS）的混合物完成木材上疏水聚硅氧烷涂层的溶胶 - 凝胶表面沉积。通过ATR-FTIR，能量分散X射线分析，X射线光电子体光谱，SEM和原子力显微镜和原子力显微镜和原子力显微镜以及溶胶 - 凝胶工艺依赖于聚硅氧烷的表面化学和形态研究通过具有表面羟基的缩聚键合到木材的网络。粘合剂中涉及的表面羟基似乎主要位于木材的纤维素组分上。木材基材上的溶胶 - 凝胶沉积物降低了水和水蒸气吸附的速率。低分子量MTMO显然穿透了木材的外表层并用羟基缩合，高分子量HDTMO可以易于易于接近。一旦附着在这样的场地，就是合理的，假设MTMO的一些表面衍生物与其他MTMOS和HDTMOS的MTMO的一些表面衍生物具有长的烃链以形成疏水的聚硅氧烷网络。因此，可以认为溶胶 - 凝胶沉积物的最终效果不仅可以降低氢键位点的表面浓度，而且还可以立体化学阻碍这种位点和水分子之间的形成氢键。 （c）2003 Wiley期刊，Inc。[参考文献：24]

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