杨木不同纹理方向介电特性初步探究  

Preliminary study on dielectric properties of poplar in different grain directions

作　　者：王佩[1] 黄思维[1] 张芮[1] 周定国[1] 

机构地区：[1]南京林业大学材料科学与工程学院,南京210037

出　　处：《林业科技开发》2015年第2期99-101,共3页China Forestry Science and Technology

基　　金：国家林业公益性行业科研专项"木质纤维化学材料及功能化技术"(201104004)

摘　　要：对杨木在室温下不同纹理方向、不同含水率及不同频率下的介电特性进行了测量.结果显示,杨木顺纹方向介电特性比横纹方向更为明显,介电常数和损耗因子都随含水率的增加而增大,且当含水率在0 ～5％时,木材介电常数随含水率的提高而增加得较为缓慢,介电常数随频率的增大逐渐变小,而介电损耗随频率增大而加大.研究结果为杨木高频加热、干燥及人造板胶合等工艺提供了理论依据.The influence of grain direction,moisture content and electric field frequency on dielectric properties of poplar was investigated. The results indicated that the direction parallel to the grain exhibited more significant dielectric behavior than that along the transverse direction. The dielectric constant and loss factor increased with the rising of moisture content,while the increase of dielectric constant was slow when the moisture content was below 5%. Dielectric constant decreased with the rising of frequency while dielectric loss increased with it. These findings provided theoretical basis for high frequency heating,drying and gluing of wood-based panel.

关 键 词：杨木 介电特性 纹理方向 频率 含水率 

分 类 号：TS611[轻工技术与工程]