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首页> 外文期刊>Journal of Wood Chemistry and Technology >Investigation of Structural Changes of Alkaline-extracted Wood Using X-ray Microtomography and X-ray Diffraction:A Comparison of Microwave versus Conventional Method of Extraction
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Investigation of Structural Changes of Alkaline-extracted Wood Using X-ray Microtomography and X-ray Diffraction:A Comparison of Microwave versus Conventional Method of Extraction

机译：X射线显微照片和X射线衍射研究碱性提取木材的结构变化：微波提取方法与常规提取方法的比较

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摘要

The effect of extraction of wood components on wood anatomy and cellulose crystallinity was studied using X-ray computed microtomography (micro CT) and X-ray crystallography. Micro CT of the xylem vessels of birch wood samples was used for the quantitative determination of the wood porosity after conventional and microwave extraction. The method was also used as an indirect means for the determination of temperature generated inside the fibers. Original porosity of birch wood was 18.5 ± 1.5%, and porosity increased with both extractions. The increase in wood porosity after 10 minutes of microwave extraction was double that of wood after conventional method of extraction at 90℃ for two hours (42% vs. 26%), indicating a sudden rupture of the wood structure due to the volumetric heating effect produced by the microwave heating. Comparison of porosities of the conventionally extracted samples at different temperatures for the same duration indicated that the temperature generated inside the fibers during 10 minutes of microwave extraction is around 12(PC. Crystallinity of cellulose did not change after both extractions, suggesting that the extraction did not affect the strength of the fibers.
机译：使用X射线计算机断层扫描（micro CT）和X射线晶体学研究了提取木材成分对木材解剖结构和纤维素结晶度的影响。桦木样品的木质部容器的显微CT用于常规和微波萃取后木材孔隙率的定量测定。该方法还用作测定纤维内部产生温度的间接手段。桦木的原始孔隙度为18.5±1.5％，两种提取方式的孔隙度均增加。微波萃取10分钟后，木材孔隙率的增加是传统方法在90℃下萃取2小时后木材孔隙率的两倍（42％比26％），这表明由于体积加热效应，木材结构突然破裂由微波加热产生。比较常规提取的样品在相同温度下在相同温度下的持续时间的孔隙率，表明在微波提取10分钟内纤维内部产生的温度约为12（PC。纤维素的结晶度在两次提取后均未改变，这表明提取确实不影响纤维的强度。

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