Liaisons dangereuses, conservation of modern and contemporary art: a study of the synthetic binding media in Portugal

Detalhes bibliográficos
Autor(a) principal: Ferreira, Joana Lia
Data de Publicação: 2011
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10362/5342
Resumo: Dissertação apresentada para obtenção do Grau de Doutor em Conservação e Restauro, especialidade de Ciências da Conservação, pela Universidade Nova de Lisboa, Faculdade de Ciências e Tecnologia
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spelling Liaisons dangereuses, conservation of modern and contemporary art: a study of the synthetic binding media in PortugalDissertação apresentada para obtenção do Grau de Doutor em Conservação e Restauro, especialidade de Ciências da Conservação, pela Universidade Nova de Lisboa, Faculdade de Ciências e TecnologiaThis project is focused on the study of synthetic materials used by Portuguese artists in the twentieth century. The aim of the study was the molecular characterization of vinyl and acrylic polymers used since the 1960s and the study of their photodegradation and evolution over time. In modern and contemporary art, water based synthetic emulsions have been widely used as painting binding media, especially acrylic and vinyl based emulsions. In some countries like Portugal where the first aqueous emulsions used as paint binders were the poly(vinyl acetate) – PVAc – ones, both as household and artist’s paints, the study of vinyl polymers is of particular importance. In Portugal these emulsions were used by outstanding artists like Joaquim Rodrigo and Ângelo de Sousa since the 1960s. In order to guarantee the preservation of the artworks for the future generations it is essential to understand how these paints will behave upon ageing. The molecular photodegradation of PVAc was studied and the presence of degradation products on reference and model samples, as well as on dated artworks was investigated. Paintings by Joaquim Rodrigo and Ângelo de Sousa, and also a hand painted catalogue for the Sabu vinyl artists’ paints, were selected as case studies. The characterization of micro-samples from the artworks provided useful information on the real evolution of the polymer binder over time. Accelerated photodegradtion studies were performed by the exposure of PVAc films on an ageing chamber equipped with a xenon-arc lamp. The behaviour of PVAc (homopolymer) was compared with a commercial emulsion(Vulcano V7) and paint reconstructions prepared in the laboratory. The results achieved by means of infrared microspectroscopy (FTIR) point out the considerably stable nature of these binding media as no molecular evidence was obtained concerning the formation of other carbonyl functions, the disappearance of the PVAc carbonyl or the formation of hydroperoxides. The polymer photodegradation process was further studied by means of size exclusion chromatography (SEC), following the molecular weight distribution and correspondent average molecular weights. It was concluded that no side-chain reactions are taking place and that main-chain scission is the foremost degradation mechanism, although not affecting the polymer performance significantly. The influence of pigments, such as titanium dioxide and iron oxide, on the polymer’s stability was also considered and it was concluded that they do not promote degradation, which might be explained due to pigment encapsulation in inert materials inhibiting its photocatalytic behaviour. The photodegradation quantum yield was determined as 7.4 x 10-8 at 313 nm for PVAc homopolymer; therefore, degradation is quantified and comparisons may be performed for different polymers. A parallel study, according to a similar experimental approach, was undertaken on the stability of poly(methyl methacrylate) – PMMA – used as acrylic sheet by the Portuguese artist Lourdes Castro.Faculdade de Ciências e TecnologiaMelo, Maria JoãoRamos, Ana MariaÁvila, María JesúsRUNFerreira, Joana Lia2011-03-11T14:36:25Z20112011-01-01T00:00:00Zdoctoral thesisinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10362/5342TID:101232500enginfo: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:RCAAP2024-05-22T17:08:39Zoai:run.unl.pt:10362/5342Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-05-22T17:08:39Repositório 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 Liaisons dangereuses, conservation of modern and contemporary art: a study of the synthetic binding media in Portugal
title Liaisons dangereuses, conservation of modern and contemporary art: a study of the synthetic binding media in Portugal
spellingShingle Liaisons dangereuses, conservation of modern and contemporary art: a study of the synthetic binding media in Portugal
Ferreira, Joana Lia
title_short Liaisons dangereuses, conservation of modern and contemporary art: a study of the synthetic binding media in Portugal
title_full Liaisons dangereuses, conservation of modern and contemporary art: a study of the synthetic binding media in Portugal
title_fullStr Liaisons dangereuses, conservation of modern and contemporary art: a study of the synthetic binding media in Portugal
title_full_unstemmed Liaisons dangereuses, conservation of modern and contemporary art: a study of the synthetic binding media in Portugal
title_sort Liaisons dangereuses, conservation of modern and contemporary art: a study of the synthetic binding media in Portugal
author Ferreira, Joana Lia
author_facet Ferreira, Joana Lia
author_role author
dc.contributor.none.fl_str_mv Melo, Maria João
Ramos, Ana Maria
Ávila, María Jesús
RUN
dc.contributor.author.fl_str_mv Ferreira, Joana Lia
description Dissertação apresentada para obtenção do Grau de Doutor em Conservação e Restauro, especialidade de Ciências da Conservação, pela Universidade Nova de Lisboa, Faculdade de Ciências e Tecnologia
publishDate 2011
dc.date.none.fl_str_mv 2011-03-11T14:36:25Z
2011
2011-01-01T00:00:00Z
dc.type.driver.fl_str_mv doctoral thesis
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10362/5342
TID:101232500
url http://hdl.handle.net/10362/5342
identifier_str_mv TID:101232500
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
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
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution 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 mluisa.alvim@gmail.com
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