Wood modification with alkoxysilanes
Wood modification with alkoxysilanes
复制标题
DOI：
10.1007/s00226-004-0257-1
复制
发表时间：
2004-11-01
影响因子：
3.4
通讯作者：
Mai, C
中科院分区：
文献类型：
--
作者：
Donath, S;Militz, H;Mai, C
用三种不同的烷氧基硅烷处理木材，它们能够经历溶胶-凝胶过程：正硅酸乙酯（TEOS），甲基三乙氧基硅烷（MTES）和丙基三乙氧基硅烷（PTEO）。两种类型的治疗进行了比较：浸渍纤维饱和木材与单体硅烷溶液，和浸渍预水解的部分低聚硅烷。木材性能，如细胞壁膨胀，防溶胀效率（ASE），吸湿性和耐久性更显着改善与单体硅烷处理的样品比低聚硅烷处理的样品。SEM-EDX图谱显示，这种处理导致更高程度的硅掺入细胞壁中，尽管与用预水解的部分低聚硅烷处理相比，重量百分比增加（WPG）较低。对土壤微生物的抵抗力在培养的初始阶段得到增强，特别是在用有机官能烷氧基硅烷处理的那些样品中。在用白腐担子菌Trametes versicolor进行的接种块试验中，在试验期内观察到耐久性的改善。在空气调节步骤期间，发生经处理的样品的重量损失，其伴随着膨胀和ASE的减少。处理后观察到的水分吸收的初始减少几乎完全消失。这种效果是由木材细胞壁中的凝胶老化来解释的，这是在处理过程中硅烷的不完全水解和缩合的结果。
Wood was treated with three different alkoxysilanes which are able to undergo a sol-gel process: tetraethoxysilane (TEOS), methyl triethoxysilane (MTES) and propyl triethoxysilane (PTEO). Two types of treatments were compared: impregnation of fibre saturated wood with monomeric silane solutions, and impregnation with pre-hydrolysed partly oligomeric silanes. Wood properties such as cell wall bulking, anti-swelling efficiency (ASE), moisture uptake and durability were more significantly improved in samples treated with monomeric silanes than in samples treated with oligomeric silanes. SEM-EDX mapping showed that this treatment resulted in a higher degree of silicon incorporation into the cell wall, although the weight percent gain (WPG) was lower compared to the treatment with pre-hydrolysed partly oligomeric silanes. The resistance against soil micro-organisms was enhanced in the initial phase of incubation especially in those samples treated with organo-functional-alkoxysilanes. In miniaturised block tests with the white-rot basidiomycete Trametes versicolor, an improved durability was observed within the test period. During an air conditioning step, a weight loss of the treated samples occurred which was accompanied by a reduction in bulking and ASE. The initial reduction of moisture uptake observed after treatment diminished almost completely. This effect was explained by an ageing of the gels in the wood cell wall which is a consequence of uncompleted hydrolysis and condensation of the silanes during the treatment.