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Differentiation between Hydrolytic and Thermo-Oxidative Degradation of Poly(lactic acid) and Poly(lactic acid)/Starch Composites in Warm and Humid Environments

dc.date.accessioned2024-08-01T12:13:46Z
dc.date.available2024-08-01T12:13:46Z
dc.date.issued2024-07-25
dc.identifierdoi:10.17170/kobra-2024080110613
dc.identifier.urihttp://hdl.handle.net/123456789/15949
dc.description.sponsorshipGefördert durch den Publikationsfonds der Universität Kassel
dc.language.isoeng
dc.rightsNamensnennung 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectbiopolymerseng
dc.subjectPLAeng
dc.subjectstarcheng
dc.subjectdurabilityeng
dc.subjectagingeng
dc.subjecthydrolysiseng
dc.subjectoxidationger
dc.subject.ddc600
dc.titleDifferentiation between Hydrolytic and Thermo-Oxidative Degradation of Poly(lactic acid) and Poly(lactic acid)/Starch Composites in Warm and Humid Environmentseng
dc.typeAufsatz
dcterms.abstractFor the application of poly(lactic acid) (PLA) and PLA/starch composites in technical components such as toys, it is essential to know their degradation behavior under relevant application conditions in a hydrothermal environment. For this purpose, composites made from PLA and native potato starch were produced using twin-screw extruders and then processed into test specimens, which were then subjected to various one-week ageing processes with varying temperatures (23, 50, 70, 90 °C) and humidity levels (10, 50, 75, 90%). This was followed by mechanical characterization (tensile test) and identification of degradation using Gel Permeation Chromatography (GPC), Thermogravimetric Analysis (TGA), Fourier Transform Infrared Spectroscopy (FTIR), and Nuclear Magnetic Resonance spectroscopy (NMR). With increasing temperature and humidity, there was a clear degradation of the PLA, which could be reduced or slowed down by adding 50 wt.% starch, due to increased crystallinity. Hydrolysis was identified as the main degradation mechanism for PLA and PLA/starch composites, especially above the glass transition temperature, with thermo-oxidative degradation also playing a subordinate role. Both hydrolytic degradation and thermo-oxidative degradation led to a reduction in mechanical properties such as tensile strength.eng
dcterms.accessRightsopen access
dcterms.creatorGoetjes, Victoria
dcterms.creatorZarges, Jan-Christoph
dcterms.creatorHeim, Hans-Peter
dcterms.extent15 Seiten
dc.relation.doidoi:10.3390/ma17153683
dc.subject.swdHydrolyseger
dc.subject.swdOxidationger
dc.subject.swdPolymilchsäureger
dc.subject.swdBioverbundwerkstoffger
dc.type.versionpublishedVersion
dcterms.source.identifiereissn:1996-1944
dcterms.source.issueIssue 15
dcterms.source.journalMaterialseng
dcterms.source.volumeVolume 17
kup.iskupfalse
dcterms.source.articlenumber3683


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Except where otherwise noted, this item's license is described as Namensnennung 4.0 International