Studies on developments of novel wooden resinified materials and wood-synthetic polymer composites

作为第一个主题，研究了化学改性木材的溶解或液化及其转化为胶粘剂的问题。为了实现木材酚类胶粘剂的高防水胶粘性，可以获得有关木素在液化和树脂化过程中的酚化、甲醛和交联剂的加入量等方面的重要信息。通过对硫代木质素酚化胶粘剂的研究，证明了其在木素酚化反应中的重要性。另一方面，在这项研究中发现，未经化学改性的木材也可以用活性有机溶剂液化，这些溶液很容易转化为胶粘剂，具有很高的粘合功能。因此，以下的研究主要集中在未经处理的木材粘合剂上。因此，可以在不对木材进行化学改性的情况下开发出具有防水胶粘性的木材酚醛树脂和木材环氧树脂胶粘剂。One o…前者的更多特点是，在氨基树脂固化温度低的情况下，可以固化具有高防水粘性的树脂。成功降低酚醛树脂胶粘剂的固化温度有助于木材单板含水率调节的模型化。木材-合成聚合物复合材料的研究有两个主题：一个是由具有热塑性和热流动性的化学改性木材和合成聚合物组成的复合材料，另一个是未经处理的木材纤维或木粉与合成聚合物的复合材料。以前的复合材料被发现含有很高比例的化学修饰木材，并且由于其高的热流动性，可以很容易地与合成聚合物混合。由于木纤维或木粉结构的混合，后一种复合材料具有高强度的特点。在这两种情况下，很明显，通过改善合成聚合物和木材本身之间的界面粘附性，可以获得具有优异物理性能的复合材料。特别是加入少量的相容剂，可以有效地改善复合材料的性能。较少

As a first topic, dissolution or liquefaction of chemically modified woods and their conversion to adhesives have been studied based on the original proposal. In order to achieve high waterproof gluability of wood phenol adhesives, avandant information could be obtained on phenolation of lignin during the liquefaction and resinification, the amount of formaldehyde and crosslinking agents added. The importance in lignin phenolation was proved by studies on phenol resinified adhesives from thiolignin. On the other hand, during this study, it has been found that non-chemically modified wood could also be liquefied with reactive organic solvents and that these solution obtained could easily converted to abhesives which have high functionality in gluing. Accordingly, following investigations have focussed on adhesives from non-treated wood. As a result, wood-phenol resin and wood-epoxy resin adhesives with waterproof gluability could be developed without chemical modification of wood. One o … More f the characteristics of the former resins is that they can be cured with high waterproof gluability at the temperature as low as amino-resins can be cured. A success in lowering the cure-temperature of resol-type phenol resin adhesives can contribute to the modelation of water content regulation of the wood veneer.Studies of wood-synthetic polymer composites have been made on two topics; one being on composites comprising chemically modified wood with thermoplasticity and thermofluidity and synthetic polymers, while the other being on composites of non-treated wood fibers or wood flours with synthetic polymers. The former composites were found to contain a high proportion of chemically modified wood and to be blended with ease with synthetic polymers because of the high thermal fluidity. The latter composites are characteristic of high strength properties due to the wood fiber or wood flour structure blended. In both cases, it became apparent that the composites with superior physical properties can be achieved by improving the gluability in its interface between synthetic polymers and wood itself. Particularly, an addition of the compatibilizer in a small amount was found to be effective in betterment of the properties of the composites. Less