Thermal Properties of Plasticized Cellulose Acetate and Its β-Relaxation Phenomenon

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dc.date.accessioned2023-06-09T12:45:17Z
dc.date.available2023-06-09T12:45:17Z
dc.date.issued2021-04-21
dc.identifierdoi:10.17170/kobra-202306098199
dc.identifier.urihttp://hdl.handle.net/123456789/14811
dc.language.isoeng
dc.relation.doidoi:10.3390/polym13091356
dc.rightsNamensnennung 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectcellulose acetateeng
dc.subjectplasticized cellulose acetateeng
dc.subjectbio-based polymerseng
dc.subjectglass temperature depressioneng
dc.subjectplasticizereng
dc.subjectglycerol triacetateeng
dc.subjecttriethyl citrateeng
dc.subjectbeta relaxationeng
dc.subjectactivation energyeng
dc.subject.ddc540
dc.subject.ddc600
dc.subject.ddc670
dc.subject.swdCelluloseger
dc.subject.swdCelluloseacetateger
dc.subject.swdEnergieger
dc.subject.swdAktivierungger
dc.subject.swdPolymereger
dc.titleThermal Properties of Plasticized Cellulose Acetate and Its β-Relaxation Phenomenoneng
dc.typeAufsatz
dc.type.versionpublishedVersion
dcterms.abstractCellulose acetate (CA), an organic ester, is a biobased polymer which exhibits good mechanical properties (e.g., high Young’s modulus and tensile strength). In recent decades, there has been significant work done to verify the thermal and thermomechanical behaviors of raw and plasticized cellulose acetate. In this study, the thermomechanical properties of plasticized cellulose acetate—especially its β-relaxation and activation energy—were investigated. The general thermal behavior was analyzed and compared with theoretical models. The study’s findings could be of special interest, due to the known β-relaxation dependency of some polymers regarding mechanical properties—which could also be the case for cellulose acetate. However, this would require further investigation. The concentration of the plasticizers—glycerol triacetate (GTA) and triethyl citrate (TEC)—used in CA ranged from 15 to 40 wt%. DMTA measurements at varying frequencies were performed, and the activation energies of each relaxation were assessed. Increasing plasticizer content first led to a shift in β-relaxation temperature to highervalues, then reached a maximum before declining again at higher concentrations. Furthermore, the activation energy of the β-relaxation constantly rose with increases in plasticizer content. The trend in the β-relaxation temperature of the plasticized CA could be interpreted as a change in the predominant phase of the overlapping β-relaxation of the CA itself and the α′-relaxation of the plasticizer—which appears in the same temperature range. The plasticizer used (GTA) demonstrated a higher plasticization efficiency than TEC. The efficiencies of both plasticizers declined with increasing plasticizer content. Additionally, both plasticizers hit the saturation point (in CA) at the lowest studied concentration (15 wt%).eng
dcterms.accessRightsopen access
dcterms.creatorErdmann, Rafael
dcterms.creatorKabasci, Stephan
dcterms.creatorHeim, Hans-Peter
dcterms.source.articlenumber1356
dcterms.source.identifiereissn:2073-4360
dcterms.source.issueIssue 9
dcterms.source.journalPolymerseng
dcterms.source.volumeVolume 13
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