Cationic cellulosic derivatives as flocculants in papermaking
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/42736 https://doi.org/10.1007/s10570-017-1313-y |
Resumo: | Water-soluble cationic cellulose derivatives were synthesized by three different procedures, cationizing bleached hardwood kraft pulp with (3- chloro-2-hydroxypropyl) trimethylammonium chloride. The first procedure involved a previous depolymerization step with orthophosphoric acid. The second one consisted on dissolving cellulose in NaOH/urea before cationization. For the third procedure, the reaction medium was heterogeneous since it was carried out with a part of cellulose with high degree of polymerization. Oppositely to the common methods, cationization occurred under mild conditions. Differences among the three derivatives are illustrated by X-ray diffraction patterns of pretreated samples, infrared spectra, and determinations of the degree of substitution, the zeta potential, the charge density and the molecular weight. The performance of these polyelectrolytes for the flocculation of mineral fillers used in papermaking was tested by laser diffraction spectrometry. The flocculant with the highest degree of polymerization and charge originated the best results, particularly when the filler used was kaolin, proving that water-soluble cationic cellulose derivatives can aid in the flocculation of fillers used in papermaking. On the contrary, the shortestchained derivative was not effective. The results were interpreted in terms of the characteristics of the cellulose derivatives flocculants and of the fillers, and neutralization and patching were proposed as the dominant mechanisms. |
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Cationic cellulosic derivatives as flocculants in papermakingCationizationCelluloseFillers for papermakingFlocculationLaser diffraction spectrometryWater-soluble cationic cellulose derivatives were synthesized by three different procedures, cationizing bleached hardwood kraft pulp with (3- chloro-2-hydroxypropyl) trimethylammonium chloride. The first procedure involved a previous depolymerization step with orthophosphoric acid. The second one consisted on dissolving cellulose in NaOH/urea before cationization. For the third procedure, the reaction medium was heterogeneous since it was carried out with a part of cellulose with high degree of polymerization. Oppositely to the common methods, cationization occurred under mild conditions. Differences among the three derivatives are illustrated by X-ray diffraction patterns of pretreated samples, infrared spectra, and determinations of the degree of substitution, the zeta potential, the charge density and the molecular weight. The performance of these polyelectrolytes for the flocculation of mineral fillers used in papermaking was tested by laser diffraction spectrometry. The flocculant with the highest degree of polymerization and charge originated the best results, particularly when the filler used was kaolin, proving that water-soluble cationic cellulose derivatives can aid in the flocculation of fillers used in papermaking. On the contrary, the shortestchained derivative was not effective. The results were interpreted in terms of the characteristics of the cellulose derivatives flocculants and of the fillers, and neutralization and patching were proposed as the dominant mechanisms.Springer2017-04-28info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/42736http://hdl.handle.net/10316/42736https://doi.org/10.1007/s10570-017-1313-yhttps://doi.org/10.1007/s10570-017-1313-yeng0969-0239e1572-882Xhttps://link.springer.com/content/pdf/10.1007%2Fs10570-017-1313-y.pdfAguado, RobertoLourenço, Ana F.Ferreira, Paulo J.Moral, AnaTijero, Antonioinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2021-06-29T10:02:53Zoai:estudogeral.uc.pt:10316/42736Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:59:22.552194Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Cationic cellulosic derivatives as flocculants in papermaking |
title |
Cationic cellulosic derivatives as flocculants in papermaking |
spellingShingle |
Cationic cellulosic derivatives as flocculants in papermaking Aguado, Roberto Cationization Cellulose Fillers for papermaking Flocculation Laser diffraction spectrometry |
title_short |
Cationic cellulosic derivatives as flocculants in papermaking |
title_full |
Cationic cellulosic derivatives as flocculants in papermaking |
title_fullStr |
Cationic cellulosic derivatives as flocculants in papermaking |
title_full_unstemmed |
Cationic cellulosic derivatives as flocculants in papermaking |
title_sort |
Cationic cellulosic derivatives as flocculants in papermaking |
author |
Aguado, Roberto |
author_facet |
Aguado, Roberto Lourenço, Ana F. Ferreira, Paulo J. Moral, Ana Tijero, Antonio |
author_role |
author |
author2 |
Lourenço, Ana F. Ferreira, Paulo J. Moral, Ana Tijero, Antonio |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Aguado, Roberto Lourenço, Ana F. Ferreira, Paulo J. Moral, Ana Tijero, Antonio |
dc.subject.por.fl_str_mv |
Cationization Cellulose Fillers for papermaking Flocculation Laser diffraction spectrometry |
topic |
Cationization Cellulose Fillers for papermaking Flocculation Laser diffraction spectrometry |
description |
Water-soluble cationic cellulose derivatives were synthesized by three different procedures, cationizing bleached hardwood kraft pulp with (3- chloro-2-hydroxypropyl) trimethylammonium chloride. The first procedure involved a previous depolymerization step with orthophosphoric acid. The second one consisted on dissolving cellulose in NaOH/urea before cationization. For the third procedure, the reaction medium was heterogeneous since it was carried out with a part of cellulose with high degree of polymerization. Oppositely to the common methods, cationization occurred under mild conditions. Differences among the three derivatives are illustrated by X-ray diffraction patterns of pretreated samples, infrared spectra, and determinations of the degree of substitution, the zeta potential, the charge density and the molecular weight. The performance of these polyelectrolytes for the flocculation of mineral fillers used in papermaking was tested by laser diffraction spectrometry. The flocculant with the highest degree of polymerization and charge originated the best results, particularly when the filler used was kaolin, proving that water-soluble cationic cellulose derivatives can aid in the flocculation of fillers used in papermaking. On the contrary, the shortestchained derivative was not effective. The results were interpreted in terms of the characteristics of the cellulose derivatives flocculants and of the fillers, and neutralization and patching were proposed as the dominant mechanisms. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-04-28 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10316/42736 http://hdl.handle.net/10316/42736 https://doi.org/10.1007/s10570-017-1313-y https://doi.org/10.1007/s10570-017-1313-y |
url |
http://hdl.handle.net/10316/42736 https://doi.org/10.1007/s10570-017-1313-y |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0969-0239 e1572-882X https://link.springer.com/content/pdf/10.1007%2Fs10570-017-1313-y.pdf |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Springer |
publisher.none.fl_str_mv |
Springer |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799133885343203328 |