期刊
POLYMER DEGRADATION AND STABILITY
卷 95, 期 9, 页码 1721-1726出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2010.05.018
关键词
CP/MAS C-13 NMR; C-13 NMR; P-31 NMR; Heat treatment; Milled wood lignin; Thermal degradation
资金
- CPER
Holocellulose, Klason lignin and milled wood lignin (MWL) of beech wood were extracted before and after heat treatment and analysed using CP MAS C-13 NMR, C-13 NMR, P-31 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 beta-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. (C) 2010 Elsevier Ltd. All rights reserved.
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