Temperature dependences of the dynamic viscoelastic properties of wood and acetylated wood swollen by water or organic liquids
Temperature dependences of the dynamic viscoelastic properties of wood and acetylated wood swollen by water or organic liquids
复制标题
DOI：
10.1007/s10086-017-1688-2
复制
发表时间：
2018-01
影响因子：
2.9
通讯作者：
Y. Miyoshi;Ai Sakae;Nao Arimura;K. Kojiro;Y. Furuta
中科院分区：
文献类型：
--
作者：
Y. Miyoshi;Ai Sakae;Nao Arimura;K. Kojiro;Y. Furuta
在本研究中，为了总结由于膨胀液体种类的差异而导致的木材和乙酰化木材的热软化行为的变化，进行了以下测量。未经处理和乙酰化的木材样品被各种液体溶胀，并且在样品之间的加热和冷却历史统一后测量动态粘弹性特性的温度依赖性。得到的结果如下。未经高极性液体溶胀处理的样品具有较低的 tanδ 峰值温度，而乙酰化样品的 tanδ 峰值温度高于未经处理的木材。另一方面，经低极性液体溶胀的未处理木材样品具有较高的 tanδ 峰值温度，而乙酰化样品的 tanδ 峰值温度低于未处理的木材。膨胀量是由木材与液体之间由于质子接受能力和液体摩尔体积等而产生的相互作用决定的，因此tanδ的峰值温度和动态弹性模量(E´)随温度升高的降低程度与膨胀量相对应。
In this study, to summarize the changes of thermal-softening behaviors of wood and acetylated wood due to differences in the kinds of swelling liquids, the following measurements were conducted. Untreated and acetylated wood samples were swollen by various liquids and the temperature dependences of the dynamic viscoelastic properties were measured after the heating and cooling histories were unified among the samples. The results obtained are as follows. Untreated samples swollen by high-polarity liquid had lower peak temperature of tanδ, however acetylated samples had higher peak temperature of tanδthan those of untreated wood. On the other hand, untreated wood samples swollen by low-polarity liquid had higher peak temperature of tanδ, however acetylated samples had lower peak temperature of tanδthan those of untreated wood. The amount of swelling is determined by interaction between wood and liquid due to proton-accepting power and molar volumes of liquid and so on, therefore the peak temperature of tanδand degree of reduction in dynamic elastic modulus (E´) with increasing temperature were corresponded to the amount of swelling.