Studies on photostability of butyrylated, milled wood lignin using spectroscopic analyses

被引：37

作者：

Chang, HT

Su, YC

Chang, ST

机构：

[1] Natl Taiwan Univ, Sch Forest Resources & Conservat, Taipei 106, Taiwan

[2] Taiwan Forestry Res Inst, Div Wood Cellulose, Council Agr, Taipei 106, Taiwan

来源：

POLYMER DEGRADATION AND STABILITY | 2006年 / 91卷 / 04期

关键词：

milled wood lignin; phenoxyl radical; photodegradation; chemical modification; butyrylation; NMR; FT-IR; ESR; light stability;

D O I：

10.1016/j.polymdegradstab.2005.06.010

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Photo-stabilisation of butyrylated milled wood lignin (MWL) was investigated in this study. Chemical changes were confirmed by NMR and FT-IR spectra after butyrylation. Improvements in the photostability of MWL by butyrylation were evaluated by spectral analyses including ESR, FT-IR and UV-VIS spectra. From ESR analyses, butyrylation reduces the amount of phenoxyl free radicals of MWL after UV irradiation, which results in inhibiting the photo-oxidation of lignin followed by a significant decrease in the formation of colored chromophores. The carbonyl, carboxyl and quinonoid structures were less detected in the butyrylated MWL after UV irradiation than those of untreated MWL, and the content of degraded water-soluble materials from the photo-degradation of MWL was also reduced upon butyrylation. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：816 / 822

页数：7

共 27 条

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