Comparative Studies on Water Vapor Sorption Characteristics between Compression Wood and Opposite Wood of Chinese Fir

Zhu LI; Fang-yu YIN; Jia-li JIANG; Jian-xiong LYU

doi:10.12326/j.2096-9694.2022018

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Comparative Studies on Water Vapor Sorption Characteristics between Compression Wood and Opposite Wood of Chinese Fir
1.Research Institute of Wood Industry， Chinese Academy of Forestry， Beijing 100091， China
Vol. 36, Issue 5, Pages: 37-42(2022)
DOI： 10.12326/j.2096-9694.2022018

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李珠,殷方宇,蒋佳荔等.杉木应压木和对应木的水分吸附特性比较研究[J].木材科学与技术,2022,36(05):37-42.

LI Zhu,YIN Fang-yu,JIANG Jia-li,et al.Comparative Studies on Water Vapor Sorption Characteristics between Compression Wood and Opposite Wood of Chinese Fir[J].Chinese Journal of Wood Science and Technology,2022,36(05):37-42.
李珠,殷方宇,蒋佳荔等.杉木应压木和对应木的水分吸附特性比较研究[J].木材科学与技术,2022,36(05):37-42. DOI： 10.12326/j.2096-9694.2022018.

LI Zhu,YIN Fang-yu,JIANG Jia-li,et al.Comparative Studies on Water Vapor Sorption Characteristics between Compression Wood and Opposite Wood of Chinese Fir[J].Chinese Journal of Wood Science and Technology,2022,36(05):37-42. DOI： 10.12326/j.2096-9694.2022018.

摘要

以杉木（,Cunninghamia lanceolata,）应压木和对应木为研究对象，采用动态水蒸气吸附仪，借助GAB模型和H-H模型探究其水分吸附特性的异同。结果表明，当相对湿度低于70%时，应压木与对应木的平衡含水率较为接近；当相对湿度高于70%时，应压木的平衡含水率低于对应木。应压木和对应木均表现出明显的吸湿滞后现象，吸湿滞后值在相对湿度70%时均达到最大，分别为3.11%和3.28%。GAB模型和H-H模型均可用于描述应压木和对应木的水分吸附等温线（,R,2,>,0.995）。通过GAB模型计算得出应压木和对应木的单分子层吸附水含量分别为6.00%和5.40%；通过H-H模型计算得出应压木的单分子层吸附水最大含量（4.93%）略高于对应木（4.72%），而应压木的多分子层吸附水最大含量（13.57%）则低于对应木（14.79%）。杉木应压木与对应木水分吸附行为的差异与其化学组分含量密切相关。,2

Abstract

In this research, differences in water adsorption behavior between the compression wood (CW) and the opposite wood (OW) from Chinese fir (,Cunninghamia lanceolata,) were investigated with the dynamic water vapor sorption analysis (DVS) using the GAB model and H-H model. Results showed that when the relative humidity (RH) of specimens was lower than 70%, the equilibrium moisture content (EMC) of CW was close to OW. When RH was above 70%, the EMC of CW was lower than that of OW. The hygroscopic hysteresis was observed for both CW and OW, and the max values of hysteresis of CW and OW was 3.11% and 3.28%, respectively. The GAB model and H-H model can be used to describe the water adsorption isotherms of CW and OW, with ,R,2, both above 0.995. In the GAB model, the monolayer molecules water adsorption for CW and OW were 6.00% and 5.40%, respectively. In the H-H model, the maximum of monolayer molecules water adsorption of CW (4.93%) was slightly higher than that of OW (4.72%), while the maximum of polylayer molecules water adsorption of CW (13.57%) was lower than that of OW (14.79%). The differences in water adsorption behavior of CW and OW were closely related to its chemical constituent contents.

关键词

杉木应压木对应木水分吸附GAB模型H-H模型

Keywords

Chinese fircompression woodopposite woodwater adsorptionGAB modelH-H model

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