Structure and Reactivity of Spruce Mechanical Pulp Lignins Part I. Bleaching and Photoyellowing ofin situLignins
作者:
Xiaoqi Pan,
Dominique Lachenal,
Catherine Lapierre,
Bernard Monties,
期刊:
Journal of Wood Chemistry and Technology
(Taylor Available online 1992)
卷期:
Volume 12,
issue 2
页码: 135-147
ISSN:0277-3813
年代: 1992
DOI:10.1080/02773819208545075
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
This paper reports the structural investigation of a series ofin situspruce lignins in wood, thermomechanical pulp (TMP) and the corresponding bleached (BTMP) and photoyellowed (YBTMP) samples. This was achieved by using an original two-step degradative technique, thioacidolysis followed by Raney nickel desulfuration. The determination of thioacidolysis monomeric and dimeric products allowed an estimate of various lignin building units and interunit bonds, respectively. It was observed that the thermomechanical and bleaching treatments did not affect spruce lignin structure to an appreciable extent. On the contrary, the photoyellowing treatment caused marked structural changes in lignin, particularly when run in severe conditions. These changes were essentially a decrease in the amount of β-O-4 and β-1 interunit bonds and a relative increase in catechol units and in vanillin end-groups.
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