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Wood Science and Technology

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01-05-2013 | Original

Location and fate of carboxyl groups in aspen alkaline peroxide-impregnated chemithermomechanical pulp fibres during alkaline peroxide bleaching

Authors: Yingjuan Fu, Menghua Qin, Yanzhu Guo, Qinghua Xu, Zongquan Li, Na Liu, Zaiwu Yuan, Yang Gao

Published in: Wood Science and Technology | Issue 3/2013

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Abstract

The origin and kinetic changes of carboxyl groups in aspen chemithermomechanical pulp (CTMP) fibres during alkaline peroxide bleaching were evaluated. The results showed that the major contributors of carboxyl groups in aspen CTMP fibres were the 4-O-methylglucuronic acid, galacturonic acid and the carboxyl groups in oxidized lignin. Alkaline peroxide bleaching could increase the total carboxyl groups, surface charge and dissolved anionic substances. However, the excess degradation by superfluous hydroxide and peroxide could result in the reduction of carboxyl groups in fibres because of the production and dissolution of low-molar-mass substances. The total carboxyl groups from polysaccharides in fibres remained constant, and the increase of carboxyl groups in fibres should result from the carboxyl groups newly formed by the lignin oxidation during peroxide bleaching. Alkaline peroxide bleaching could also result in the removal of a large part of extractives and a small fraction of lignin on the fibre surface.

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Title: Location and fate of carboxyl groups in aspen alkaline peroxide-impregnated chemithermomechanical pulp fibres during alkaline peroxide bleaching
Authors: Yingjuan Fu
Menghua Qin
Yanzhu Guo
Qinghua Xu
Zongquan Li
Na Liu
Zaiwu Yuan
Yang Gao
Publication date: 01-05-2013
Publisher: Springer-Verlag
Published in: Wood Science and Technology / Issue 3/2013
Print ISSN: 0043-7719
Electronic ISSN: 1432-5225
DOI: https://doi.org/10.1007/s00226-012-0510-y

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