Photodegradation and photostabilization of poly(3-Hydroxybutyrate)

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dc.contributor.authorWellen R.M.R.
dc.contributor.authorCanedo E.L.
dc.contributor.authorRabello M.S.
dc.contributor.authorFechine G.J.M.
dc.date.accessioned2024-03-13T00:52:54Z
dc.date.available2024-03-13T00:52:54Z
dc.date.issued2016
dc.description.abstractThe 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.
dc.description.firstpage759
dc.description.issuenumber4
dc.description.lastpage764
dc.description.volume19
dc.identifier.doi10.1590/1980-5373-MR-2015-0666
dc.identifier.issn1516-1439
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/35956
dc.relation.ispartofMaterials Research
dc.rightsAcesso Aberto
dc.subject.otherlanguageBiodegradable polymers
dc.subject.otherlanguagePHB
dc.subject.otherlanguagePhotodegradation
dc.subject.otherlanguagePhotostabilization
dc.subject.otherlanguageUltraviolet radiation
dc.titlePhotodegradation and photostabilization of poly(3-Hydroxybutyrate)
dc.typeArtigo
local.scopus.citations11
local.scopus.eid2-s2.0-84981249343
local.scopus.subjectCommercial grade
local.scopus.subjectHydroxyvalerate
local.scopus.subjectInjection moulded
local.scopus.subjectMacromolecular structures
local.scopus.subjectPhotostabilization
local.scopus.subjectPoly(3-hydroxybutyrate)
local.scopus.subjectSurface appearance
local.scopus.subjectSurface colors
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84981249343&origin=inward
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