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首页> 外文期刊>Journal of Applied Polymer Science >Spectroscopic studies and evaluation of thermorheological properties of softwood and hardwood lignin
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Spectroscopic studies and evaluation of thermorheological properties of softwood and hardwood lignin

机译：软木和硬木木质素的光谱学研究和热流变性能评估

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Fourier transform infrared spectroscopy (FTIR) was used to determine characteristic absorption peaks of softwood kraft lignin and soda hardwood lignin. Remarkable spectral differences were noticed between the different lignins due to their various chemical structures. Proton nuclear magnetic resonance spectrometry (1H NMR) was employed to analyze the structure of lignin. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF) provided important data regarding the molecular weight distribution of lignin. Thermal stability of softwood lignin was found to be remarkably higher than that of hardwood lignin. Softening temperature and glass transition temperature of lignin were measured by differential scanning calorimetry (DSC) which was useful in selecting an optimal temperature profile during extrusion process. Rheological studies provided valuable information about the viscosity of lignins.
机译：傅里叶变换红外光谱（FTIR）用于确定软木牛皮纸木质素和苏打硬木木质素的特征吸收峰。由于它们不同的化学结构，在不同的木质素之间发现了明显的光谱差异。质子核磁共振光谱法（1 H NMR）被用来分析木质素的结构。基质辅助激光解吸/电离飞行时间质谱（MALDI-TOF）提供了有关木质素分子量分布的重要数据。发现软木木质素的热稳定性显着高于硬木木质素。木质素的软化温度和玻璃化转变温度通过差示扫描量热法（DSC）进行测量，这对于选择挤出过程中的最佳温度曲线很有用。流变学研究提供了有关木质素粘度的有价值的信息。

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