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Title: Lignin enhances cellulose dissolution in cold alkali
Authors: Costa, Carolina
Medronho, Bruno 
Eivazi, Alireza
Svanedal, Ida
Lindman, Björn 
Edlund, Håkan 
Norgren, Magnus
Keywords: Cellulose amphiphilicity; Dissolution; Lignin; NaOH (aq.) solvent
Issue Date: 15-Nov-2021
Project: CEECIND/01014/2018 
Serial title, monograph or event: Carbohydrate Polymers
Volume: 274
Abstract: Aqueous sodium hydroxide solutions are extensively used as solvents for lignin in kraft pulping. These are also appealing systems for cellulose dissolution due to their inexpensiveness, ease to recycle and low toxicity. Cellulose dissolution occurs in a narrow concentration region and at low temperatures. Dissolution is often incomplete but additives, such as zinc oxide or urea, have been found to significantly improve cellulose dissolution. In this work, lignin was explored as a possible beneficial additive for cellulose dissolution. Lignin was found to improve cellulose dissolution in cold alkali, extending the NaOH concentration range to lower values. The regenerated cellulose material from the NaOH-lignin solvents was found to have a lower crystallinity and crystallite size than the samples prepared in the neat NaOH and NaOH-urea solvents. Beneficial lignin-cellulose interactions in solution state appear to be preserved under coagulation and regeneration, reducing the tendency of crystallization of cellulose.
ISSN: 01448617
DOI: 10.1016/j.carbpol.2021.118661
Rights: openAccess
Appears in Collections:I&D CQC - Artigos em Revistas Internacionais

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