Structure and Reactivity of Spruce Mechanical Pulp Lignins Part III. Bleaching and Photoyellowing of Isolated Lignin Fractions
作者:
Xiaoqi Pan,
Dominique Lachenal,
期刊:
Journal of Wood Chemistry and Technology
(Taylor Available online 1993)
卷期:
Volume 13,
issue 2
页码: 145-165
ISSN:0277-3813
年代: 1993
DOI:10.1080/02773819308020512
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Organosolv lignin fractions were used as substrate for further investigations on the effect of bleaching and photoyellowing on lignin. These lignins were extracted from spruce TMP, bleached TMP (BTMP) and bleached and yellowed TMP (YBTMP). Furthermore, lignin fractions from TMP were also directly submitted to bleaching conditions and lignin fractions from BTMP to irradiation in the solid state. These lignin samples were all analyzed by thioacidolysis and FT-IR spectroscopy. The bleaching did not substantially change the lignin polymer but considerably destroyed some chromophoric structures such as coniferaldehyde end-groups. On the other hand, the photoyellowing resulted in marked degradations of lignin, shown by a decrease in the amount of β-O-4 and β-1 interunit bonds and a substantial increase in vanillin and vanillic acid end-groups and in catechol units.
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