木材光降解机理及研究进展  

Wood Photodegradation Mechanism and Its Research Advances

作　　者：韩英磊[1] 李艳云[1] 周宇[1] 

机构地区：[1]中国林业科学研究院木材工业研究所国家林业局木材科学重点实验室,北京100091

出　　处：《世界林业研究》2011年第4期35-39,共5页World Forestry Research

基　　金：木质产品耐光性评定与检测技术研究(200904065)

摘　　要：木材受紫外可见光照射后易发生降解,表面的材色和力学性能都会下降,大大影响木材的使用价值和美学特点。文中针对木材光降解机理进行了讨论,在提出木质素是木材光降解中关键组分的同时,强调了抽提物对木材光变色的具体影响;通过详细叙述光降解过程中木材发生的化学变化,进一步表明该过程中自由基中间体的生成和新的发色团的产生;系统总结了影响木材光降解的主要因素,并提出防治木材表面光降解的技术手段。Photodegradation may easily happen on the surface of wood when exposed to solar radiation of UV-Vis region.This also induces discoloration of the surface and the decrease of wood physical properties,which degrade the utilities and aesthetics of wood.The paper discussed the mechanism of wood photodegradation.Lignin was believed to be the key factor in photodegradation while the highlight was put on the specific influence of the extractives on discoloration of wood surface.The chemical changes during the photodegradation were described in detail to show how free radicals and new chromophores get formed finally.Meanwhile,the paper also systemically expounded the main factors influencing the photodegradation and came up with the technology against the photodegradation of wood surface.

关 键 词：木材 光降解 自由基 发色团 乙酰化 阻胺类光稳定剂 

分 类 号：S781[农业科学—木材科学与技术]