Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate)

Detalhes bibliográficos
Autor(a) principal: Wellen,Renate Maria Ramos
Data de Publicação: 2016
Outros Autores: Canedo,Eduardo Luís, Rabello,Marcelo Silveira, Fechine,Guilhermino José Macêdo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392016000400759
Resumo: The present work is concerned with the photodegradation and photostabilization of poly(3-hydroxybutyrate) (PHB) biopolymer. Two commercial grades of PHB were investigated, containing of 4.0% and 6.2% of hydroxyvalerate (HV) comonomer, named PHB1 and PHB2, respectively. Injection moulded specimens were exposed to ultraviolet radiation (UV-A) in the laboratory for periods of up to 12 weeks and then characterized by tensile testing, surface appearance, size exclusion chromatography (SEC), and scanning electron microscopy (SEM). The exposure to UV radiation caused great damaged on the surface color, reduction of molecular size and mechanical properties. The effects were more pronounced on PHB2, probably due a lighter surface color and less packed macromolecular structure which facilitates the transmission of light throughout the samples. Specimens of PHB1 were also injected with the addition of a UV absorber and antioxidant, resulting in a higher UV stability of PHB, as shown by a low reduction in molar mass and better mechanical properties.
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spelling Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate)Biodegradable polymersPHBultraviolet radiationphotodegradationphotostabilizationThe present work is concerned with the photodegradation and photostabilization of poly(3-hydroxybutyrate) (PHB) biopolymer. Two commercial grades of PHB were investigated, containing of 4.0% and 6.2% of hydroxyvalerate (HV) comonomer, named PHB1 and PHB2, respectively. Injection moulded specimens were exposed to ultraviolet radiation (UV-A) in the laboratory for periods of up to 12 weeks and then characterized by tensile testing, surface appearance, size exclusion chromatography (SEC), and scanning electron microscopy (SEM). The exposure to UV radiation caused great damaged on the surface color, reduction of molecular size and mechanical properties. The effects were more pronounced on PHB2, probably due a lighter surface color and less packed macromolecular structure which facilitates the transmission of light throughout the samples. Specimens of PHB1 were also injected with the addition of a UV absorber and antioxidant, resulting in a higher UV stability of PHB, as shown by a low reduction in molar mass and better mechanical properties.ABM, ABC, ABPol2016-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392016000400759Materials Research v.19 n.4 2016reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/1980-5373-MR-2015-0666info:eu-repo/semantics/openAccessWellen,Renate Maria RamosCanedo,Eduardo LuísRabello,Marcelo SilveiraFechine,Guilhermino José Macêdoeng2016-09-16T00:00:00Zoai:scielo:S1516-14392016000400759Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2016-09-16T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate)
title Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate)
spellingShingle Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate)
Wellen,Renate Maria Ramos
Biodegradable polymers
PHB
ultraviolet radiation
photodegradation
photostabilization
title_short Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate)
title_full Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate)
title_fullStr Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate)
title_full_unstemmed Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate)
title_sort Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate)
author Wellen,Renate Maria Ramos
author_facet Wellen,Renate Maria Ramos
Canedo,Eduardo Luís
Rabello,Marcelo Silveira
Fechine,Guilhermino José Macêdo
author_role author
author2 Canedo,Eduardo Luís
Rabello,Marcelo Silveira
Fechine,Guilhermino José Macêdo
author2_role author
author
author
dc.contributor.author.fl_str_mv Wellen,Renate Maria Ramos
Canedo,Eduardo Luís
Rabello,Marcelo Silveira
Fechine,Guilhermino José Macêdo
dc.subject.por.fl_str_mv Biodegradable polymers
PHB
ultraviolet radiation
photodegradation
photostabilization
topic Biodegradable polymers
PHB
ultraviolet radiation
photodegradation
photostabilization
description The present work is concerned with the photodegradation and photostabilization of poly(3-hydroxybutyrate) (PHB) biopolymer. Two commercial grades of PHB were investigated, containing of 4.0% and 6.2% of hydroxyvalerate (HV) comonomer, named PHB1 and PHB2, respectively. Injection moulded specimens were exposed to ultraviolet radiation (UV-A) in the laboratory for periods of up to 12 weeks and then characterized by tensile testing, surface appearance, size exclusion chromatography (SEC), and scanning electron microscopy (SEM). The exposure to UV radiation caused great damaged on the surface color, reduction of molecular size and mechanical properties. The effects were more pronounced on PHB2, probably due a lighter surface color and less packed macromolecular structure which facilitates the transmission of light throughout the samples. Specimens of PHB1 were also injected with the addition of a UV absorber and antioxidant, resulting in a higher UV stability of PHB, as shown by a low reduction in molar mass and better mechanical properties.
publishDate 2016
dc.date.none.fl_str_mv 2016-08-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392016000400759
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392016000400759
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/1980-5373-MR-2015-0666
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.19 n.4 2016
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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