<論文>木材表面のプラスチック化

Abstract

ベソジル化あるいはアシル化反応により,木材の表面のみをプラスチック化することを試み,走査電顕による表面観察と,2・3の物性測定を行った。処理は,試片厚さおよび樹種に大きく依存した。厚い広葉樹試作で,良好な結果が得られた。処理木材は,吸湿性を示したが,寸法変化は少なかった。このことは,表面のプラスチック層に,肉眼では検知できなし小さな穴や亀裂が多く存在することによると考えられた。また,処理木材は,無処理木材に比べて,低い誘電率の値を示した。

Surface layer of wood specimen was converted into plastics through chemical modifications such as acylation with trifluoro acetic anhydride-higher aliphatic acids and benzylation with benzylchrolide, and an observation of the plasticized layer by a scanning electron microscope as well as measurements of some physical properties of the chemically treated specimen were carried out. The results were remarkably affected by wood species and thickness of the specimens. Good results were obtained on thick hardwood specimens. The treatments improved dimensional stability of wood without remarkable reduction of hygroscopicity. This effect was considered to result from many pinholes and small cracks existing in the plasticized layer which could not be detected by the naked eye. The chemically treated wood specimens had a low dielectric constant value compared with the untreated ones.