Study on the Influence Mechanisms of Superheated Steam Pressures on Dynamic Viscoelastic Properties of Surface-Compressed Wood

XIANG Elin; HUANG Rongfeng

doi:10.12326/j.2096-9694.2025013

SPECIAL SUBJECT ON PERMANENT SETTING OF COMPRESSION WOOD | Views : 0 下载量: CSCD: 0 CNKI被引量: 0 Crossref: 0 Wos: 0 Scopus: 0 更多指标

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Study on the Influence Mechanisms of Superheated Steam Pressures on Dynamic Viscoelastic Properties of Surface-Compressed Wood
Research Institute of Wood Industry，Chinese Academy of Forestry，Beijing 100091，China
Vol. 39, Issue 4, Pages: 33-39(2025)
DOI： 10.12326/j.2096-9694.2025013
稿件说明：

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向娥琳,黄荣凤.过热蒸汽压力对表层压缩木材动态黏弹性的影响机制研究[J].木材科学与技术,2025,39(04):33-39. DOI： 10.12326/j.2096-9694.2025013.

XIANG Elin,HUANG Rongfeng.Study on the Influence Mechanisms of Superheated Steam Pressures on Dynamic Viscoelastic Properties of Surface-Compressed Wood[J].Chinese Journal of Wood Science and Technology,2025,39(04):33-39. DOI： 10.12326/j.2096-9694.2025013.

摘要

以毛白杨（

Populus tomentosa

）边材为试验对象，采用表层压缩和过热蒸汽对其进行联合处理。利用扫描电子显微镜和傅里叶变换红外光谱表征表层压缩和不同蒸汽压力（0.1~0.7 MPa、180 ℃、）对木材细胞形态和化学结构的影响，并采用

动态热机械分析仪探究木材的动态黏弹性变化情况。结果表明：当测试温度由30 ℃增加至300 ℃，过热蒸汽处理定型材（简称定型材）的相对贮存模量的降低幅度明显高于对照材和压缩材。与压缩材相比，较低（≤0.3 MPa）蒸汽压力下，定型材的损耗模量变化不明显；当蒸汽压力超过0.5 MPa时，随着蒸汽压力升高，定型材α力学松弛损耗峰温度和所需的表观活化能分别降低了11~45 ℃和22.89%~50.28%。过热蒸汽处理后，压缩材中半纤维素脱乙酰基、木质素发生降解反应，使得低分子量高聚物占比升高，压缩材弹性和黏滞性回复下降，尺寸稳定性增强。研究结果可以为过热蒸汽处理表层压缩木材的加工利用提供理论依据。

Abstract

In this study

a combination of surface compression and superheated steam treatment was conducted to improve the properties of poplar (

Populus tomentosa

) sapwood. The effects of surface compression and varying steam pressures (180 ℃

0.1~0.7 MPa) on the cellular morphology and chemical structure of the surface-compressed wood were investigated using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). When the test temperature increased from 30 ℃ to 300 ℃

the reduction in the relative storage modules of the permanent setting wood treated with superheated steam (referred to as the permanent setting wood) was significantly greater than that of the control wood and the compressed wood. Compared to compressed wood

at a lower steam pressure (≤0.3 MPa)

the loss modulus of the permanent setting wood showed no significant changes. However

when the steam pressure exceeded 0.5 MPa

both the peak temperature and apparent activation energy of α mechanical relaxation loss gradually decreased along with the increasing of steam pressures

by 11~45 ℃ and 22.89%~50.28%

respectively. After superheated steam treatment

deacetylation of hemicelluloses and lignin degradation reactions occurred in the compressed wood. This led to an increasing proportion of low molecular weight polymers and reducing the elasticity and viscosity recovery of the compressed wood. As a result

the dimensional stability was enhanced. The findings of this study provide a theoretical basis for the processing and utilization of surface-compressed wood with superheated steam treatment.

关键词

Keywords

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