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首页> 外文期刊>Journal of Applied Polymer Science >Some physical properties of acetosolv lignins from bagasse
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Some physical properties of acetosolv lignins from bagasse

机译：蔗渣中乙酰酚木质素的一些物理性质

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Acetosolv-solubilized lignins were characterized by their solubility in different organic solvents, Fourier transform infrared, C-13-NMR, UV, gel permeation chromatography, differential scanning calorimetry, and thermogravimetric analysis. Solvents having a solubility parameter in the range of 1.0-12.7 and a hydrogen-bonding parameter in the range of 3.6-5 were considered good solvents for acetosolv lignins. Fourier transform infrared spectra of the lignins were typical. for lignins containing p-hydroxy phenylpropane (H), guaiacyl (G), and syringyl (S) units. The lignins contained more conjugated and fewer nonconjugated C=O groups, and the guaiacyl groups were etherified and condensed. C-13-NMR confirmed partial acetylation of the lignins and the presence of beta-O-4 and beta-5 linkages. Acetosolv lignins also showed the typical UV spectrum of annual plants. The effects of the acetic acid concentration and pulping time on the molecular weights of the lignins were explained with the presieving and condensation concepts. The thermal behavior of the acetosolv lignins was also studied. (c) 2008 Wiley Periodicals, Inc.
机译：乙酰溶剂化的木质素的特征在于它们在不同有机溶剂中的溶解度，傅立叶红外光谱，C-13-NMR，UV，凝胶渗透色谱，差示扫描量热法和热重分析。溶解度参数在1.0-12.7范围内且氢键参数在3.6-5范围内的溶剂被认为是乙酰溶剂木质素的良好溶剂。木质素的傅立叶变换红外光谱是典型的。用于含有对羟基苯丙烷（H），愈创木脂基（G）和丁香基基（S）单元的木质素。木质素包含更多的共轭和更少的非共轭C = O基团，并且愈创木脂基醚化并缩合。 C-13-NMR证实了木质素的部分乙酰化以及存在β-O-4和β-5键。乙酰溶剂木质素还显示出一年生植物的典型紫外线光谱。用筛分和缩合概念解释了乙酸浓度和制浆时间对木质素分子量的影响。还研究了乙酰溶剂木质素的热行为。 （c）2008 Wiley期刊公司

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