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Material valorisation of amorphous polylactide. Influence of thermo-mechanical degradation on the morphology, segmental dynamics, thermal and mechanical performance

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Material valorisation of amorphous polylactide. Influence of thermo-mechanical degradation on the morphology, segmental dynamics, thermal and mechanical performance

dc.contributor.author	Badia Valiente, José David
dc.contributor.author	Strömberg, E.
dc.contributor.author	Karlsson, S.
dc.contributor.author	Ribes Greus, A.
dc.date.accessioned	2020-12-15T16:46:28Z
dc.date.available	2020-12-15T16:46:28Z
dc.date.issued	2012
dc.identifier.citation	Badia Valiente, José David Strömberg, E. Karlsson, S. Ribes Greus, A. 2012 Material valorisation of amorphous polylactide. Influence of thermo-mechanical degradation on the morphology, segmental dynamics, thermal and mechanical performance Polymer Degradation and Stability 97 4 670 678
dc.identifier.uri	https://hdl.handle.net/10550/76684
dc.description.abstract	This paper reports the effects of multiple mechanical recycling on the structure and properties of amorphous polylactide (PLA). The influence of the thermo-mechanical degradation induced by means of five successive injection cycles was initially addressed in terms of macroscopic mechanical properties and surface modification. A deeper inspection on the structure and morphology of PLA was associated to the thermal properties and viscoelastic behaviour. Although FT-IR analysis did not show significant changes in functional groups, a remarkable reduction in molar mass was found by viscometry. PLA remained amorphous throughout the reprocessing cycles, but the occurrence of a cold-crystallization during DSC and DMTA measurements, which enthalpy increased with each reprocessing step, suggested chain scission due to thermo-mechanical degradation. The effect of chain shortening on the glass-rubber relaxation studied by DMTA showed an increase in free volume affecting the segmental dynamics of PLA, particularly after the application of the second reprocessing step, in connection to the overall loss of performance showed by the remaining properties.
dc.language.iso	eng
dc.relation.ispartof	Polymer Degradation and Stability, 2012, vol. 97, num. 4, p. 670-678
dc.subject	Termoplàstics
dc.subject	Materials
dc.title	Material valorisation of amorphous polylactide. Influence of thermo-mechanical degradation on the morphology, segmental dynamics, thermal and mechanical performance
dc.type	journal article	es_ES
dc.date.updated	2020-12-15T16:46:29Z
dc.identifier.doi	10.1016/j.polymdegradstab.2011.12.019
dc.identifier.idgrec	134914
dc.rights.accessRights	open access	es_ES