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Increased processing temperature assisted reactive toughening of poly(lactic acid)
- Source :
- eXPRESS Polymer Letters, Vol 17, Iss 2, Pp 169-180 (2023)
- Publication Year :
- 2023
- Publisher :
- Budapest University of Technology, 2023.
-
Abstract
- Toughening efficiency of poly(ethylene-n-butylene-acrylate-co-glycidyl methacrylate) (EBA-GMA) in poly(lactic acid) (PLA) matrix has been found to significantly increase at elevated blending temperature. In the case of PLA/EBAGMA blends having 10.0 or 12.5 wt% EBA-GMA contents, the accelerated PLA degradation at raised processing temperature resulted in reduced mechanical performance. At 15.0 wt% EBA-GMA ratio, however, increased elongation and by 250% improved notched Izod impact strength was achieved when the blending temperature was raised from 240 to 260 °C. This beneficial effect is attributed to the accelerated compatibilization reactions between the components in the presence of shortchain PLA molecules, which allow the rapid formation of a toughening enhancer interphase (TEI) during melt processing. As a result, the brittle-ductile transition can be reached at lower elastomer content than expected. Decreased melt flow index (MFI) values besides stabilized blend morphology indicated efficient PLA–EBA-GMA compatibilization at elevated processing temperature. Accordingly, enhanced nucleation ability of the PLA/EBA-GMA interphase and hindered chain crystallization of PLA were found by differential scanning calorimetry (DSC) analyses. In association with the intensified compatibilization reactions cross-linking of the terpolymer was also revealed using the thermally stimulated depolarization current (TSDC) technique.
Details
- Language :
- English
- ISSN :
- 1788618X
- Volume :
- 17
- Issue :
- 2
- Database :
- Directory of Open Access Journals
- Journal :
- eXPRESS Polymer Letters
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.4aa51b9a0e424bbcb5fabeba68eb82
- Document Type :
- article
- Full Text :
- https://doi.org/10.3144/expresspolymlett.2023.12