Photodegradation of poly(3-hydroxybutyrate)

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dc.contributor.authorSadi R.K.
dc.contributor.authorFechine G.J.M.
dc.contributor.authorDemarquette N.R.
dc.date.accessioned2024-03-13T01:30:35Z
dc.date.available2024-03-13T01:30:35Z
dc.date.issued2010
dc.description.abstractThe effect of ultraviolet radiation on the properties of poly(3-hydroxybutyrate) (PHB) was studied. The PHB investigated is produced from microbial fermentation using saccharose from sugarcane as the carbon source to the bacteria. The material was exposed to artificial UV-A radiation for 3, 6, 9 and 12 weeks. The photodegradation effect was followed by changes of molecular weight, of chemical and crystalline structures, of thermal, morphological, optical and mechanical properties, as well as of biodegradability. The experimental results showed that PHB undergoes both chain scission and crosslinking reactions, but the continuous decrease in its mechanical properties and the low amount of gel content upon UV exposure indicated that the scission reactions were predominant. Molar mass, melting temperature and crystallinity measurements for two layers of PHB samples with different depth suggested that the material has a strong degradation profile, which was attributed to its dark colour that restricted the transmission of light. Previous photodegradation initially delayed PHB biodegradability, due to the superficial increase in crystallinity seen with UV exposure. The possible reactions taking place during PHB photodegradation were presented and discussed in terms of the infrared and nuclear magnetic resonance spectra. A reference peak (internal standard) in the infrared spectra was proposed for PHB photodegradation.© 2010 Elsevier Ltd. All rights reserved.
dc.description.firstpage2318
dc.description.issuenumber12
dc.description.lastpage2327
dc.description.volume95
dc.identifier.doi10.1016/j.polymdegradstab.2010.09.003
dc.identifier.issn0141-3910
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/37132
dc.relation.ispartofPolymer Degradation and Stability
dc.rightsAcesso Restrito
dc.subject.otherlanguagePHB
dc.subject.otherlanguagePhoto-oxidation
dc.subject.otherlanguagePhotodegradation
dc.subject.otherlanguagePolyhydroxybutyrate
dc.subject.otherlanguageUV
dc.titlePhotodegradation of poly(3-hydroxybutyrate)
dc.typeArtigo
local.scopus.citations67
local.scopus.eid2-s2.0-78649451258
local.scopus.subjectCarbon source
local.scopus.subjectChain scission
local.scopus.subjectCrosslinking reaction
local.scopus.subjectCrystalline structure
local.scopus.subjectCrystallinities
local.scopus.subjectCrystallinity measurements
local.scopus.subjectDegradation profiles
local.scopus.subjectGel contents
local.scopus.subjectInfrared spectrum
local.scopus.subjectInternal standards
local.scopus.subjectMelting temperatures
local.scopus.subjectMicrobial fermentation
local.scopus.subjectOptical and mechanical properties
local.scopus.subjectPHB
local.scopus.subjectPoly(3-hydroxybutyrate)
local.scopus.subjectPolyhydroxybutyrate
local.scopus.subjectScission reactions
local.scopus.subjectTwo layers
local.scopus.subjectUV
local.scopus.subjectUV exposure
local.scopus.subjectUVA radiation
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=78649451258&origin=inward
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