论文部分内容阅读
为了揭示真空热处理温度与时间对落叶松木材动态粘弹性的影响,以落叶松木材为研究对象,分别在160℃、200℃和240℃的条件下对其进行真空热处理4h,在200℃的条件下对其进行真空热处理2h、6h、10h。利用动态粘弹性分析仪测试了未处理材与热处理材在温度30~300℃范围内,测试频率1Hz条件下的动态粘弹性。结果表明:随着测试温度的逐渐升高,未处理材与热处理材的储存模量均呈下降的趋势,损耗模量呈现先升高后下降的变化趋势;在相同的测试条件下,热处理木材的储存模量均高于未处理材的储存模量;随着热处理温度的升高和热处理时间的延长,木材的储存模量逐渐增大;在测试的温度范围内,可以观察到2个力学松弛过程,热处理木材的α力学损耗峰温度高于未处理材的α力学损耗峰温度,热处理后木材的β力学损耗峰强度降低。
In order to reveal the effect of vacuum heat treatment temperature and time on the dynamic viscoelasticity of larch wood, the larch wood was taken as the research object and subjected to vacuum heat treatment at 160 ℃, 200 ℃ and 240 ℃ for 4h respectively. Under the condition of 200 ℃ Under vacuum heat treatment 2h, 6h, 10h. The dynamic viscoelasticity of untreated material and heat-treated material at temperature of 30 ~ 300 ℃ and frequency of 1Hz was tested by dynamic viscoelasticity analyzer. The results show that with the increasing of the test temperature, the storage modulus of the untreated and the heat treated materials decrease and the loss modulus increases first and then decreases. Under the same test conditions, the heat treatment of wood Of the storage modulus is higher than the untreated material storage modulus; with the heat treatment temperature and heat treatment time, the storage modulus of wood gradually increased; in the test temperature range, you can observe the 2 mechanics In the relaxation process, the peak temperature of α-loss of heat-treated wood is higher than that of untreated wood, and the peak intensity of β-loss of wood decreases after heat treatment.