Photodegradation and Photostabilization of Poly(3-Hydroxybutyrate)
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , |
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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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 |
_version_ |
1754212667929657344 |