Studies of Multi-Functional Wood Boron-compounds Composites.

本研究旨在通过简单的一次操作，在两年的时间里获得多功能木材硼化合物复合材料。结果表明：1）硼氧化物微溶于水，溶于一元醇。结果表明，用硼氧化物浸渍甲醇可得到木材硼氧化物复合材料。2）扫描电镜和X射线微区分析表明，木材细胞中的硼氧化物主要存在于木材细胞壁中。通过X-射线衍射分析，推测木材细胞壁中的氧化硼为酯键结构。3）含20%氧化硼的云杉-木材氧化硼复合材料（SW-B-C）的表观密度为0.56 g/cm ^3。这种复合材料是一种理想的复合材料，因为与未经处理的云杉木材的密度（0.51 g/cm ^3）相比，它的重量略有变化。在力学性能方面，添加20%氧化硼的SW-B-C板材的抗压强度和抗弯强度分别是未添加氧化硼的云杉板材的2倍和1.5倍具有20%的硼氧化物含量的（2 mm厚）直到约355 ℃才燃烧。另一方面，相同厚度的未处理云杉木材在约250 ℃下燃烧。这些木材硼-氧化物复合材料似乎有可能满足不燃材料II的耐燃性水平。

This study was investigated for getting the multi functional wood boron-compounds composite by simple single operation during two years. The results are as follows.1) It has been found that boron-oxide is slightly soluble in water, but is soluble in mono-alcohol. As a results, the wood boron-oxide compositewas obtained by impregnating metylalcohol with boron-oxide into wood.2) It was found by scanning electron microscopy (SEM) and X-ray microanalyzer that the boron-oxide in wood cell existed chiefly in wood cell walls. And, the chemical structure of the boron-oxide in wood cell wallwas estimated to be ester-linkage by X-ray diffraction analysis.3) The apparent density of the spruce-wood boron-oxide composite (SW-B-C) contained with 20% boron-oxide was 0.56 g/cm^3. This composite is an ideal one, because it is slightly changeable on its weight as compared with the density of untreated spruce wood (0.51 g/cm^3). And, on its mechanical properties, the compression strength and the bending strengthof SW-B-C contained with 20% boron oxide were espectively 2 times and 1.5 times those of untreated spruce wood.4) On the burnning resistance, the thin SW-B-C board (2 mm thickness) with 20% boron-oxide content did not burn until about 355ﾟC.On the other hand, untreated spruce wood of the same thickness burned atabout 250ﾟC.It was appeared that these wood boron-oxide conposites had the posibility to satisfy the burning resistance level of the incom-bustible material II.