文献类型：期刊文献

中文题名：热处理毛竹材吸湿与解吸特性

英文题名：The adsorption and desorption characteristics of moso bamboo induced by heat treatment

作者：雷文成[1] 张亚梅[1] 于文吉[1] 余养伦[1]

第一作者：雷文成

机构：[1]中国林业科学研究院木材工业研究所,北京100091

年份：2021

卷号：6

期号：3

起止页码：41-46

中文期刊名：林业工程学报

外文期刊名：Journal of Forestry Engineering

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD_E2021_2022】；

基金：国家自然科学基金(31700482)。

语种：中文

中文关键词：热处理;毛竹;吸湿;解吸;Guggenheim-Anderson-deBoer(GAB)模型;Hailwood-Horrobin(H-H)模型

外文关键词：heat treatment;moso bamboo;adsorption;desorption;Guggenheim-Anderson-deBoer(GAB)model;Hailwood-Horrobin(H-H)model

分类号：S781.9

摘要：热处理作为一种绿色环保的物理改性方法,已经在木、竹材企业得到广泛应用。竹材在180℃热处理时,其力学性能损失较小,尺寸稳定性能得到较好的改善。为揭示热处理对竹材吸湿解吸特性的影响,选择180℃对毛竹进行处理,并利用动态水分吸附分析仪(DVS)测试了热处理前后竹材在温度为25℃和相对湿度为5%-90%-5%条件下的等温吸附曲线。在上述试验的基础上,采用Guggenheim-Anderson-deBoer(GAB)和Hailwood-Horrobin(H-H)2种模型对试验数据进行了拟合分析。结果表明:与原竹相比,热处理竹材的平衡含水率降低;GAB模型分析结果显示,热处理降低了竹材的单分子层水吸附能力,但没有改变表面水分子与吸附点位之间的相互作用;H-H模型分析结果显示,热处理后竹材单分子层和多分子层的吸附水含量降低,而单分子层/多分子层的吸附水比例增大;傅里叶红外分析结果显示,热处理竹材的化学成分降解,亲水性官能团的含量减少。热处理后竹材中化学成分的变化是竹材吸湿和解吸特性变化的主要因素。
As an important renewable biomass material,bamboo has been used in different fields such as building materials,furniture,handicrafts,et al.However,because of the existence of hydrophilic functional groups in the components,the bamboo cell wall absorbs or desorbs water with the changes of the surrounding relative humidity(RH).This character of bamboo leads to cracks,deformation and biological contaminants.Therefore,the applications of bamboo have been limited by its low dimensional stability and poor biological durability,particularly in humid environments.Heat treatment is an environment-friendly method that is considered as a favorable approach to improve the dimensional stability of bamboo.Additionally,the bamboo heat-treated at 180℃can facilitate its effective use for indoor and outdoor applications.However,the mechanism of the effect of 180℃heat treatment on the adsorption and desorption characteristics of bamboo is unclear.Therefore,the adsorption and desorption characteristics of moso bamboo induced by heat treatment were studied by dynamic vapor sorption(DVS)at 25℃and in the RH range of 5%-90%-5%,and the experimental data were fitted by the Guggenheim-Anderson-deBoer(GAB)model and Hailwood-Horrobin(H-H)model.Meanwhile,the chemical modifications of the bamboo samples were examined by the Fourier transform infrared spectrometer(FT-IR).The results showed that the heat-treated bamboo had much lower moisture contents both in the adsorption and desorption process,especially at high relative humidity,and the hysteresis coefficient of bamboo increased after the heat treatment.The analysis using the GAB model and H-H model showed that heat treatment decreased the water sorption capability of bamboo,but had no effect on the equilibrium constant related to the multilayer sorption,and both the moisture contents of monolayer sorption and multilayer sorption were reduced by the heat treatment.Furthermore,as indicated by the FT-IR analysis,the contents of hygroscopic groups,such as OH,C O and C—O groups in bamboo were decreased by the heat treatment.These groups were the main adsorption groups in the monolayer sorption process,the decrease of these groups in bamboo consequently decreased the moisture content of monolayer sorption.The reduction of the hygroscopic groups was the main reason of the changes in the adsorption and desorption processes of the heat-treated bamboo.