Effect of treatment temperature on structures and properties of flax rove in supercritical carbon dioxide
Effect of treatment temperature on structures and properties of flax rove in supercritical carbon dioxide
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DOI：
10.1177/0040517516676068
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发表时间：
2018
影响因子：
2.3
通讯作者：
Juan Zhang;Huanda Zheng;Laijiu Zheng
中科院分区：
文献类型：
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作者：
Juan Zhang;Huanda Zheng;Laijiu Zheng
在超临界二氧化碳环境下对亚麻粗纱进行处理。采用扫描电镜（SEM）、傅里叶变换红外光谱（FT-IR）、x射线衍射（XRD）、热分析（NMR）和核磁共振（NMR）研究了不同处理温度对亚麻粗纱表面形貌、化学和晶体结构、热性能以及分离化合物的影响。结果表明，超临界二氧化碳处理后的亚麻纤维表面出现了更温和的凹槽和条纹。红外光谱显示，亚麻纤维的大分子发生了水解，产生了一个C≡C基团。XRD谱图证实，随着处理温度的升高，处理后亚麻样品的结晶度逐渐升高。同时，热重分析仪（TGA）、差热重分析仪（DTG）和差示扫描量热仪（DSC）分析表明，随着处理温度的升高，亚麻粗纱的热性能有所改善。此外，核磁共振分析证实了从亚麻中提取的木质素和分离化合物的单糖组成。此外，分离得到的化合物的木质素以β - o - 4′芳醚键为主，其次是β - 5′苯香豆素键和β -β′树脂醇键。因此，研究结果证实了用超临界二氧化碳对亚麻粗纱进行精练漂白在技术上是可行的。
In this study, flax rove was treated in supercritical carbon dioxide. The effect of different treatment temperatures on the surface morphology, chemical and crystal structures, and thermal properties, as well as isolated compounds of flax rove, were investigated by employing scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermal analysis, and nuclear magnetic resonance (NMR), respectively. The results showed that more mild grooves and stripes appeared on the surface of the treated flax fibers after supercritical carbon dioxide treatment. FT-IR spectra showed that hydrolysis of macromolecule of flax fibers occurred, producing a C≡C group. XRD spectra confirmed that the crystallinity of the treated flax samples was gradually increased with the raising of treatment temperature. Simultaneously, thermo gravimetric analyzer (TGA), differential thermal gravity (DTG) and differential scanning calorimetry (DSC) analysis indicated that the thermal properties of flax rove were improved with the increase of treatment temperature. In addition, NMR analysis proved that lignin and the monosaccharide composition of isolated compound were extracted from flax rove. Moreover, a predominance of β–O–4’ arylether linkages, followed by β–5’ phenylcoumaran and β–β’ resinol-type linkages for lignins of isolated compound was shown in NMR. Therefore, the results confirmed that it is technically feasible to using supercritical carbon dioxide to conduct the scouring and bleaching of flax rove.