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https://hdl.handle.net/10316/96446
Título: | Lignin enhances cellulose dissolution in cold alkali | Autor: | Costa, Carolina Medronho, Bruno Eivazi, Alireza Svanedal, Ida Lindman, Björn Edlund, Håkan Norgren, Magnus |
Palavras-chave: | Cellulose amphiphilicity; Dissolution; Lignin; NaOH (aq.) solvent | Data: | 15-Nov-2021 | Projeto: | CEECIND/01014/2018 UID/QUI/00313/2020 info:eu-repo/grantAgreement/FCT/PTDC/ASP-SIL/30619/2017 info:eu-repo/grantAgreement/FCT/UIDB/05183/2020 |
Título da revista, periódico, livro ou evento: | Carbohydrate Polymers | Volume: | 274 | Resumo: | 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. | URI: | https://hdl.handle.net/10316/96446 | ISSN: | 01448617 | DOI: | 10.1016/j.carbpol.2021.118661 | Direitos: | openAccess |
Aparece nas coleções: | I&D CQC - Artigos em Revistas Internacionais |
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Lignin enhances cellulose dissolution in cold alkali.pdf | 2.65 MB | Adobe PDF | Ver/Abrir |
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