抽提物对高温热处理材光降解进程的影响

doi:10.3969/j.issn.0253-2417.2017.04.008

林产化学与工业 ›› 2017, Vol. 37 ›› Issue (4): 51-58.doi: 10.3969/j.issn.0253-2417.2017.04.008

抽提物对高温热处理材光降解进程的影响

沈海颖, 曹金珍, 蒋军, 王佳敏

北京林业大学材料科学与技术学院, 北京 100083

收稿日期:2016-10-21 出版日期:2017-08-25 发布日期:2017-09-02
通讯作者: 曹金珍,教授,博士生导师,研究领域为木材功能性改良;E-mail:caoj@bjfu.edu.cn E-mail:caoj@bjfu.edu.cn
作者简介:沈海颖(1989-),女,河北唐山人,博士生,主要研究方向为木材功能性改良
基金资助:
中央高校基本科研业务费专项资金（2015ZCQ-CL-01）

Effects of Extractives on Photo-degradation of Thermally-modified Wood During Artificial Weathering

SHEN Haiying, CAO Jinzhen, JIANG Jun, WANG Jiamin

College of Material Science and Technology, Beijing Forestry University, Beijing 100083, China

Received:2016-10-21 Online:2017-08-25 Published:2017-09-02

摘要/Abstract

摘要： 将经3种不同抽提处理的高温热处理欧洲赤松（Pinus sylvestris L.）和山毛榉（Fagus longipetiolata Seem.）木材及其对照材置于氙灯老化箱中加速老化1008 h，测定老化过程中表面颜色的变化，并使用扫描电镜（SEM）、傅里叶红外光谱（FT-IR）和X射线光电子能谱（XPS）分析老化前后木材表面宏观和微观结构的变化，旨在探究不同抽提物对高温热处理材的光降解进程的影响。结果表明：1）高温热处理材中抽提物的存在有利于缓解其光老化进程，提高热处理材的颜色稳定性；2）碱抽提物对热处理山毛榉表面材色的影响最为显著，其存在有利于延缓老化过程中热处理材表面颜色的变化，苯醇及冷水抽提出的极性抽提物对热处理材的颜色稳定性具有积极作用，冷水抽提后的热处理山毛榉在老化过程中出现射线细胞剥离现象； 3）在老化过程中，热处理欧洲赤松的表面颜色变化相对山毛榉大，这是因为热处理欧洲赤松的材色较山毛榉浅，碱抽提物对热处理欧洲赤松颜色稳定性的影响相对较小，而苯醇抽提物及冷水抽出物可提高其耐老化性。

关键词: 热处理, 光降解, 抽提物, 宏观结构, 微观结构

Abstract: In order to investigate the effects of extractives on photo-degradation of thermally-modified wood during artificial weathering, different kinds of extracted thermally-modified and unmodified wood samples were exposed in a xenon weatherometer for 1008 h and then the surface color and chemical changes were tested by chromameter, scanning electron microscope (SEM), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FT-IR) and X-ray photoelectron spectroscopy (XPS), respectively. The results showed that:1) The existence of polar extractives with low molecular weight could release the photodegradation of thermally-modified wood, but could not prevent the degradation of lignin and the formation of carbonyl derivatives during weathering; 2) Alkali extractive influenced the color of beech wood most significantly and slowed the color change during weathering. Polar substances that were extracted with benzene-ethanol and water showed positive effects for improving the color stability of thermally-modified beech. Exfoliation of wood ray cells occurred in water extracted thermally-modified beech; 3) The color change of thermally-modified Scots pine was more obvious than beech wood during weathering because original color of Scots pine was slighter than beech wood. The effect of alkali extractives on color stability of thermally-modified Scots pine was not significant, while benzene-ethanol and water extractives improved the anti-weathering property of Scots pine significantly.

Key words: thermal modification, photo-degradation, extractive, macrostructure, microstrructure

中图分类号:

TQ35
TS6

沈海颖, 曹金珍, 蒋军, 王佳敏. 抽提物对高温热处理材光降解进程的影响[J]. 林产化学与工业, 2017, 37(4): 51-58.

SHEN Haiying, CAO Jinzhen, JIANG Jun, WANG Jiamin. Effects of Extractives on Photo-degradation of Thermally-modified Wood During Artificial Weathering[J]. Chemistry and Industry of Forest Products, 2017, 37(4): 51-58.

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抽提物对高温热处理材光降解进程的影响

Effects of Extractives on Photo-degradation of Thermally-modified Wood During Artificial Weathering

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