Spectroscopic Studies and Evaluation of Thermorheological Properties of Softwood and Hardwood Lignin

被引：60

作者：

Awal, Abdul ^{[1
]}

Sain, Mohini ^{[1
]}

机构：

[1] Univ Toronto, Ctr Biocomposites & Biomat Proc, Toronto, ON M5S 3B3, Canada

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2011年 / 122卷 / 02期

关键词：

lignin; FTIR spectroscopy; molecular weight; thermal properties; rheological properties; MOLAR-MASS; FIBERS; MELTS;

D O I：

10.1002/app.34211

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 [高分子化学与物理];

摘要：

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 ((1)H 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. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: 956-963, 2011

引用

页码：956 / 963

页数：8

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