木材动态黏弹性的湿热耦合效应

doi:10.11707/j.1001-7488.20141214

林业科学 ›› 2014, Vol. 50 ›› Issue (12): 101-108.doi: 10.11707/j.1001-7488.20141214

木材动态黏弹性的湿热耦合效应

蒋佳荔^1,2, 吕建雄²

1. 中国林业科学研究院林业新技术研究所北京 100091;
2. 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与技术重点实验室北京 100091

收稿日期:2014-01-22 修回日期:2014-05-13 出版日期:2014-12-25 发布日期:2015-01-08
通讯作者: 吕建雄
基金资助:
中国林业科学研究院林业新技术所基本科研业务费专项基金(CAFINT2014C03);国家自然科学基金青年科学基金项目(31000266).

Hydrothermal Effects on Dynamic Viscoelastic Properties of Wood

Jiang Jiali^1,2, Lü Jianxiong²

1. Research Institute of Forestry New Technology, CAF Beijing 100091;
2. Key Laboratory of Wood Science and Technology of State Forestry Administration Research Institute of Wood Industry, CAF Beijing 100091

Received:2014-01-22 Revised:2014-05-13 Online:2014-12-25 Published:2015-01-08

摘要/Abstract

摘要：

采用动态热机械分析仪(DMA Q800),在一系列恒定温湿度场(温度: 25 ~ 90 ℃,湿度: 0 ~ 93%)中测定不同含水率(0 ~ 19.39%)人工林杉木木材试样的贮存模量和损耗因子在550 min湿热耦合作用过程中的经时变化,研究湿热耦合作用对木材动态黏弹性的影响.结果表明: 湿热耦合作用可以降低木材半纤维素和木质素的玻璃化转变温度.对于全干材试样,没有出现木材软化现象; 对于含水率为5.88% ~ 13.36%的木材试样,可在40 ~ 60 ℃温度域内观察到半纤维素的湿热软化现象; 对于含水率为9.08% ~ 19.39%的木材试样,当温度高于50 ℃时可观察到木质素的湿热软化现象.研究表明,升高温度或增加木材含水率均能缩短引起半纤维素和木质素发生软化的热作用时间.

关键词: 杉木, 含水率, 湿热耦合, 相对贮存模量, 损耗因子

Abstract:

The hydrothermal effects of time and temperature on dynamic viscoelastic properties of Chinese fir (Cunninghamia lanceolata) were investigated using dynamic mechanical analysis (DMA Q800) in this study. The tests were applied to specimens at a series of constant temperature and humidity fields (25- 90 ℃, 0-93%) for 550 min. Changes in storage modulus and loss tangent with heating time were examined. The results indicated that the impacts of hydrothermal processes mainly resulted in the decreasing of glass transition temperature of hemicellulose and lignin. For absolutely dried wood, there was no softening occurred in this study. At the temperature range of 40 ℃ to 60 ℃, a relaxation phenomenon was observed for wood with 5.88% -13.36% MC, which could be attributed to the glass transition of hemicellulose. At the temperatures above 50 ℃, an increasing trend of loss factor with heating time due to the hydrothermal softening of lignin was observed for wood with 9.08% -19.39% MC. It is suggested that the hemicellulose and lignin softening occur at higher temperatures or higher moisture content with shorter heating times.

Key words: Chinese fir, moisture content, hydrothermal, relative storage modulus, loss factor

中图分类号:

S781

蒋佳荔, 吕建雄. 木材动态黏弹性的湿热耦合效应[J]. 林业科学, 2014, 50(12): 101-108.

Jiang Jiali, Lü Jianxiong. Hydrothermal Effects on Dynamic Viscoelastic Properties of Wood[J]. Scientia Silvae Sinicae, 2014, 50(12): 101-108.

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木材动态黏弹性的湿热耦合效应

Hydrothermal Effects on Dynamic Viscoelastic Properties of Wood

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