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首页> 外文期刊>Journal of Applied Polymer Science >Enhancement of oxidative stabilization of viscose rayon fibers impregnated with ammonium sulfate prior to carbonization and activation steps
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Enhancement of oxidative stabilization of viscose rayon fibers impregnated with ammonium sulfate prior to carbonization and activation steps

机译：在碳化和活化步骤之前，增强浸渍有硫酸铵的粘胶人造丝纤维的氧化稳定性

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摘要

The oxidative thermal stability of microcrystalline plant-based viscose rayon cellulose fiber was improved in the presence of an ammonium sulfate solution. The structural characterization of the oxidized samples was carried out using a combination of fiber thickness, linear density, burning test, X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and infrared (IR) spectroscopy measurements. Oxidized viscose rayon fibers showed physical and chemical transformations with increasing oxidation temperature and were characterized by a reduction in fiber diameter and linear density values together with color changes with increasing oxidation temperature. The results obtained from XRD analysis showed the loss of crystallinity due to the amorphization processes. XRD analysis also showed increasing conversion to a highly crosslinked and cyclized structure with progressing temperature. The DSC and TGA measurements indicated that there was an improvement in thermal stability. The results obtained from IR spectra showed the progress of dehydrogenation and dehydration reactions. IR spectra in the 2000-800 cm-1 region showed a loss of crystalline structure confirming the results of XRD. The IR spectra of the oxidized samples also showed the conversion of primary hydroxyl (OH) groups to carbonyl (C=O) groups and the presence of C=C double bonds arising from the formation of a cyclized and crosslinked structure.
机译：在硫酸铵溶液的存在下，基于微晶植物的粘胶人造丝纤维素纤维的氧化热稳定性得到改善。使用纤维厚度，线密度，燃烧测试，X射线衍射（XRD），差示扫描量热法（DSC），热重分析（TGA）和红外（IR）光谱的组合进行氧化样品的结构表征测量。氧化粘胶人造丝纤维随着氧化温度的升高而表现出物理和化学转变，其特征是纤维直径和线密度值的减小以及随着氧化温度的升高而颜色变化。 XRD分析获得的结果表明由于非晶化过程导致结晶度的损失。 XRD分析还显示随着温度的升高，向高度交联和环化结构的转化增加。 DSC和TGA测量表明，热稳定性有所提高。从IR光谱获得的结果表明了脱氢和脱水反应的进展。 2000-800 cm-1区域的红外光谱显示晶体结构损失，证实了XRD的结果。氧化样品的IR光谱还显示伯羟基（OH）基团向羰基（C = O）基团的转化以及由于环化和交联结构的形成而存在的C = C双键。

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