文献类型：期刊文献

中文题名：木材动态粘弹性的含水率依存性

英文题名：Moisture dependence of the dynamic viscoelastic properties for wood

作者：蒋佳荔[1] 吕建雄[1]

第一作者：蒋佳荔

通信作者：Jiang, J.-L.

机构：[1]中国林业科学研究院木材工业研究所

年份：2006

卷号：0

期号：S2

起止页码：118-123

中文期刊名：北京林业大学学报

外文期刊名：Journal of Beijing Forestry University

收录：CSTPCD;;EI(收录号：20071610557069);Scopus(收录号：2-s2.0-34147208219);北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金项目(30271053)

语种：中文

中文关键词：杉木;贮存模量;损耗模量;损耗峰温度;表观活化能;平衡含水率

外文关键词：Chinese fir, storage modulus, loss modulus, loss peak temperature, apparent activation energy, equilibrium moisture content

分类号：S781

摘要：该文研究了不同含水率平衡态下杉木人工林木材的动态粘弹性质.测定的温度范围为-120~40℃,频率范围为0·5~10Hz.结果表明:①随着含水率增加,木材的贮存模量随温度升高而降低的程度增大.②在测定温度范围内观察到两个力学松弛过程,较高温度域的α力学松弛过程是由低分子量的半纤维素发生玻璃化转变引起的;低温域的β力学松弛过程是基于木材细胞壁无定型区中伯醇羟基的回转取向运动与吸着水分子的回转取向运动两者叠加而成.③力学松弛过程的损耗峰温度随着含水率的增加而降低,随着测量频率的增加而向高温方向移动.④力学松弛过程的表观活化能随着含水率的增加而减小.
The dynamic viscoelastic properties of Cunninghamia lanceolata(Lamb.) Hook. plantation wood with various equilibrium moisture content had been studied in the temperature range from -120 to 40℃ at frequencies ranging from 0.5 to 10 Hz. The results showed that:1)with moisture content increasing, the decreasing extent of wood storage modulus extended with temperature increasing;2) two mechanical relaxation processes were observed in this study. The α relaxation process in high temperature range was due to glass transition of hemicellulose with low molecular weight, while the β relaxation process occurred in low temperature range was based on the reorientation of methylol groups in amorphous of wood cell wall and the reorientation of adsorbed moisture moleculars in wood; 3)the loss peak temperature of mechanical relaxation process moved to lower temperature range with the increase of moisture content, and moved to higher temperature range with the testing frequency increase; 4)the apparent activation energy of mechanical relaxation process decreased with the increase of moisture content.