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首页> 外文期刊>Wood and Fiber Science >Effect of pH on chemical components and mechanical properties of thermally modified wood.
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Effect of pH on chemical components and mechanical properties of thermally modified wood.

机译：pH对热改性木材化学成分和机械性能的影响。

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摘要

To investigate the correlation between acidity and degradation during thermal treatment of wood, Cathay poplar (Populus cathayana Rehd.) wood samples were impregnated with solutions of different pH values, which included disodium octoborate tetrahydrate (DOT, pH=8.3), monoethanolamine (MEA, pH=12), and four buffering solutions composed of boric acid and sodium hydroxide (BA/NaOH, pH=6, 7, 8, 9). Samples were then heated for 4 h at 180, 200, and 2208 deg;C, respectively. Bending MOR and MOE, mass losses, pH values, and percentages of lignin and hemicelluloses were subsequently determined in thermally modified samples and compared with control samples without pretreatment and/or thermal treatment. Results of the experiments indicated that DOT and buffering solutions decreased mass loss of thermally treated wood and increased bending MOR and MOE, whereas MEA pretreatment increased mass loss and showed comparable or even lower bending MOR and MOE than the untreated control with or without thermal treatments. Chemical analyses suggested that degradation of hemicelluloses was inhibited by DOT and BA/NaOH pretreatments within the temperature range 180-200 degrees C, which may explain the mechanical property improvement.
机译：为了研究木材热处理过程中酸度与降解之间的相关性，将国泰杨树（ Populus cathayana Rehd。）木材样品浸入了不同pH值的溶液，其中包括四水合辛硼酸二钠（DOT，pH = 8.3），单乙醇胺（MEA，pH = 12）和四种由硼酸和氢氧化钠组成的缓冲溶液（BA / NaOH，pH = 6，7，8，9）。然后将样品分别在180、200和2208℃下加热4小时。随后在热改性样品中测定弯曲的MOR和MOE，质量损失，pH值以及木质素和半纤维素的百分比，并与未经预处理和/或热处理的对照样品进行比较。实验结果表明，DOT和缓冲溶液减少了热处理木材的质量损失，并增加了弯曲MOR和MOE，而MEA预处理增加了质量损失，并且与未处理的有或没有热处理的对照相比，弯曲MOR和MOE相当甚至更低。化学分析表明，在180-200摄氏度的温度范围内，DOT和BA / NaOH预处理抑制了半纤维素的降解，这可以解释其机械性能的提高。

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