A study on the spectral changes of reactive textile dyes and their implications for online control of dyeing processes

Detalhes bibliográficos
Autor(a) principal: Santos, Jorge Gomes
Data de Publicação: 2009
Outros Autores: Soares, Graça M. B., Hrdina, Radim, Campos, Ana M. F. Oliveira, Gomes, Jaime Rocha
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/14444
Resumo: Evidence is presented that confirms the colour changes of a widely used trichromatic mixture of bifunctional reactive dyes (Levafix CA) under alkaline conditions, showing that they occur slowly and throughout the dyeing time, and not instantly after alkali addition to the dyebath. Thus, it is impossible to determine the specific absorptivity of the dyes at each moment of the dyeing process. An investigation into the relationship of the type of reactive group to the dye and the visible spectral changes over time was undertaken. Model reactive dyes were studied. The samples collected from the simulated dyebaths were monitored online using an automated system and their absorption on the whole of the visible spectrum was measured. The studies of dyes that included halo-s-triazinyl groups revealed the existence of hypochromic shifts in the spectra of the dyes in the presence of an electrolyte (sodium chloride or sodium sulphate) and bathochromic and hyperchromic shifts, when evaluated in the presence of alkaline agents. However, the vinylsulphonyl derivatives present a more stable spectral profile. The use of buffer solution at pH 5 was an efficient method to stabilise the absorption profile of Levafix CA trichromatic samples.
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spelling A study on the spectral changes of reactive textile dyes and their implications for online control of dyeing processesOn-line controlDyeingTextileReactive dyesScience & TechnologyEvidence is presented that confirms the colour changes of a widely used trichromatic mixture of bifunctional reactive dyes (Levafix CA) under alkaline conditions, showing that they occur slowly and throughout the dyeing time, and not instantly after alkali addition to the dyebath. Thus, it is impossible to determine the specific absorptivity of the dyes at each moment of the dyeing process. An investigation into the relationship of the type of reactive group to the dye and the visible spectral changes over time was undertaken. Model reactive dyes were studied. The samples collected from the simulated dyebaths were monitored online using an automated system and their absorption on the whole of the visible spectrum was measured. The studies of dyes that included halo-s-triazinyl groups revealed the existence of hypochromic shifts in the spectra of the dyes in the presence of an electrolyte (sodium chloride or sodium sulphate) and bathochromic and hyperchromic shifts, when evaluated in the presence of alkaline agents. However, the vinylsulphonyl derivatives present a more stable spectral profile. The use of buffer solution at pH 5 was an efficient method to stabilise the absorption profile of Levafix CA trichromatic samples.We thank Fundacao para a Ciencia e Tecnologia and FEDER (POCTI-SFA-3-686). Radim Hrdina thanks the Ministry of Education, Youth and Sports of the Czech Republic for research grant VS MSMT 0021627501.WileyUniversidade do MinhoSantos, Jorge GomesSoares, Graça M. B.Hrdina, RadimCampos, Ana M. F. OliveiraGomes, Jaime Rocha20092009-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/14444eng1478-440810.1111/j.1478-4408.2008.00169.xhttp://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2008.00169.x/abstractinfo: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:RCAAP2023-07-21T12:32:00Zoai:repositorium.sdum.uminho.pt:1822/14444Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:27:18.146128Repositório 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 A study on the spectral changes of reactive textile dyes and their implications for online control of dyeing processes
title A study on the spectral changes of reactive textile dyes and their implications for online control of dyeing processes
spellingShingle A study on the spectral changes of reactive textile dyes and their implications for online control of dyeing processes
Santos, Jorge Gomes
On-line control
Dyeing
Textile
Reactive dyes
Science & Technology
title_short A study on the spectral changes of reactive textile dyes and their implications for online control of dyeing processes
title_full A study on the spectral changes of reactive textile dyes and their implications for online control of dyeing processes
title_fullStr A study on the spectral changes of reactive textile dyes and their implications for online control of dyeing processes
title_full_unstemmed A study on the spectral changes of reactive textile dyes and their implications for online control of dyeing processes
title_sort A study on the spectral changes of reactive textile dyes and their implications for online control of dyeing processes
author Santos, Jorge Gomes
author_facet Santos, Jorge Gomes
Soares, Graça M. B.
Hrdina, Radim
Campos, Ana M. F. Oliveira
Gomes, Jaime Rocha
author_role author
author2 Soares, Graça M. B.
Hrdina, Radim
Campos, Ana M. F. Oliveira
Gomes, Jaime Rocha
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Santos, Jorge Gomes
Soares, Graça M. B.
Hrdina, Radim
Campos, Ana M. F. Oliveira
Gomes, Jaime Rocha
dc.subject.por.fl_str_mv On-line control
Dyeing
Textile
Reactive dyes
Science & Technology
topic On-line control
Dyeing
Textile
Reactive dyes
Science & Technology
description Evidence is presented that confirms the colour changes of a widely used trichromatic mixture of bifunctional reactive dyes (Levafix CA) under alkaline conditions, showing that they occur slowly and throughout the dyeing time, and not instantly after alkali addition to the dyebath. Thus, it is impossible to determine the specific absorptivity of the dyes at each moment of the dyeing process. An investigation into the relationship of the type of reactive group to the dye and the visible spectral changes over time was undertaken. Model reactive dyes were studied. The samples collected from the simulated dyebaths were monitored online using an automated system and their absorption on the whole of the visible spectrum was measured. The studies of dyes that included halo-s-triazinyl groups revealed the existence of hypochromic shifts in the spectra of the dyes in the presence of an electrolyte (sodium chloride or sodium sulphate) and bathochromic and hyperchromic shifts, when evaluated in the presence of alkaline agents. However, the vinylsulphonyl derivatives present a more stable spectral profile. The use of buffer solution at pH 5 was an efficient method to stabilise the absorption profile of Levafix CA trichromatic samples.
publishDate 2009
dc.date.none.fl_str_mv 2009
2009-01-01T00:00:00Z
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/1822/14444
url http://hdl.handle.net/1822/14444
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 1478-4408
10.1111/j.1478-4408.2008.00169.x
http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2008.00169.x/abstract
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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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
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