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Surface characterization and biodegradability of sodium hydroxide-treated Moso bamboo substrates
European Journal of Wood and Wood Products ( IF 2.6 ) Pub Date : 2020-11-22 , DOI: 10.1007/s00107-020-01613-x
Haixia Yu , Honglian Zheng , Mengyao Zhan , Wenfu Zhang , Jin Wang , Xin Pan , Xiao-wei Zhuang

Alkali solution immersion is widely used as a pretreatment process during bamboo and wood product manufacturing. In this study, a surface analysis on bamboo chips pre-treated with sodium hydroxide (NaOH) at room temperature was performed. The influence of this treatment on the bamboo surface color, microstructure, surface chemical composition, and biological resistance was evaluated. The surface color rapidly became dark at 5% NaOH and became rough at 20% NaOH. After the alkali treatment, an absorption peak occurred near wavelengths of 390–410 nm in the Kubelka–Munk curve, owing to the presence of chromophore groups derived from lignin. Fourier transform infrared spectroscopy revealed that the conjugate structure of lignin-phenols changed after proton transfer in a hydroxyl radical solution. During the treatment, lignin and hemicellulose in the bamboo degraded to some extent, but cellulose was less affected. X-ray photoelectron spectroscopy demonstrated that the oxygen-carbon ratio and the oxygenated to unoxygenated carbon ratio increased with the treatment, indicating a decrease in the amount of extractives and lignin. X-ray diffraction results showed that the area of the crystallization zone increased rapidly at 5% NaOH and then decreased. Furthermore, upon reaching the crystalline region, the NaOH solution led to swelling of the cell wall, thereby increasing the accessibility of fungi and, hence, the susceptibility of the bamboo to fungi infection. The bamboo weight loss of decay after the alkaline treatment was larger than that of the control and was a maximum at 10% NaOH.



中文翻译:

氢氧化钠处理的毛竹基材的表面表征和生物降解性

碱溶液浸入被广泛用作竹木产品制造中的预处理过程。在这项研究中,对在室温下用氢氧化钠(NaOH)预处理的竹片进行了表面分析。评估了这种处理对竹子表面颜色,微观结构,表面化学成分和生物抗性的影响。在5%的NaOH下,表面颜色迅速变暗,而在20%的NaOH下,表面颜色变粗糙。碱处理后,由于存在木质素衍生的生色基团,在Kubelka-Munk曲线中的390-410 nm波长附近出现一个吸收峰。傅里叶变换红外光谱显示,木质素-酚的共轭​​结构在质子转移到羟基自由基溶液后发生变化。在治疗期间 竹子中的木质素和半纤维素有一定程度的降解,但对纤维素的影响较小。X射线光电子能谱表明,氧碳比和氧化碳与未氧化碳的比率随处理而增加,表明提取物和木质素的量减少。X射线衍射结果表明,在5%的NaOH中,结晶区的面积迅速增加,然后减小。此外,在到达结晶区时,NaOH溶液导致细胞壁膨胀,从而增加了真菌的可及性,因此增加了竹子对真菌感染的敏感性。碱处理后竹子腐烂的失重比对照大,在10%NaOH时最大。X射线光电子能谱表明,氧碳比和氧化碳与未氧化碳的比率随处理而增加,表明提取物和木质素的量减少。X射线衍射结果表明,在5%的NaOH中,结晶区的面积迅速增加,然后减小。此外,在到达结晶区时,NaOH溶液导致细胞壁膨胀,从而增加了真菌的可及性,因此增加了竹子对真菌感染的敏感性。碱处理后竹子腐烂的失重比对照大,在10%NaOH时最大。X射线光电子能谱表明,氧碳比和氧化碳与未氧化碳的比率随处理而增加,表明提取物和木质素的量减少。X射线衍射结果表明,在5%的NaOH中,结晶区的面积迅速增加,然后减小。此外,在到达结晶区时,NaOH溶液导致细胞壁膨胀,从而增加了真菌的可及性,因此增加了竹子对真菌感染的敏感性。碱处理后竹子腐烂的失重比对照大,在10%NaOH时最大。表明提取物和木质素的量减少。X射线衍射结果表明,在5%的NaOH中,结晶区的面积迅速增加,然后减小。此外,在到达结晶区时,NaOH溶液导致细胞壁膨胀,从而增加了真菌的可及性,因此增加了竹子对真菌感染的敏感性。碱处理后竹子腐烂的失重比对照大,在10%NaOH时最大。表明提取物和木质素的量减少。X射线衍射结果表明,在5%的NaOH中,结晶区的面积迅速增加,然后减小。此外,在到达结晶区时,NaOH溶液导致细胞壁膨胀,从而增加了真菌的可及性,因此增加了竹子对真菌感染的敏感性。碱处理后竹子腐烂的失重比对照大,在10%NaOH时最大。竹子对真菌感染的敏感性。碱处理后竹子腐烂的失重比对照大,在10%NaOH时最大。竹子对真菌感染的敏感性。碱处理后竹子腐烂的失重比对照大,在10%NaOH时最大。

更新日期:2020-11-22
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