木质素
乙醚
大小排阻色谱法
山毛榉
摩尔质量分布
碳-13核磁共振
材料科学
化学结构
凝胶渗透色谱法
聚合物
化学
有机化学
植物
生物
酶
作者
Nicolas Brosse,Roland El Hage,Mounir Chaouch,Mathieu Pétrissans,Éric Gelhaye,Philippe Gérardin
标识
DOI:10.1016/j.polymdegradstab.2010.05.018
摘要
Holocellulose, Klason lignin and milled wood lignin (MWL) of beech wood were extracted before and after heat treatment and analysed using CP MAS 13C NMR, 13C NMR, 31P NMR and size exclusion chromatography (SEC). Experimental results showed that the thermal treatment degrades hemicelluloses and affects lignin polymer through depolymerisation due mainly to cleavage of β-aryl-ether linkages and recondensation reactions. The spectroscopic analysis of MWL demonstrated that these recondensation reactions involved mainly guaiacyl units through formation of 5,5′-biphenolic and diarylmethane structures. Analysis of molecular weight distribution of MWL by SEC indicated that average molecular weights of heat treated milled wood lignin were lower than those of native milled wood lignin.
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