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Hygrothermal ageing of reprocessed polylactide

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Hygrothermal ageing of reprocessed polylactide

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dc.contributor.author	Badia Valiente, José David
dc.contributor.author	Santonja-Blasco, L.
dc.contributor.author	Martínez-Felipe, A.
dc.contributor.author	Ribes Greus, A.
dc.date.accessioned	2019-10-21T13:43:59Z
dc.date.available	2019-10-21T13:43:59Z
dc.date.issued	2012
dc.identifier.citation	Badia Valiente, José David Santonja-Blasco, L. Martínez-Felipe, A. Ribes Greus, A. 2012 Hygrothermal ageing of reprocessed polylactide Polymer Degradation and Stability 97 10 1881 1890
dc.identifier.uri	https://hdl.handle.net/10550/71779
dc.description.abstract	The influence of an accelerated hygrothermal ageing simulation test on a commercial PLA and its three subsequent mechanically-reprocessed materials was studied. The analysis was focused on the water diffusion kinetics and the physico-chemical changes induced by the hygrothermal degradation. Water diffusion proceeded faster than chain relaxation processes, as defined by a Case II absorption model. It was proved that the water diffusion rate decreased with subsequent reprocessing cycles and increased with higher hygrothermal ageing temperatures. Hydrolytic chain scission provoked significant molar mass decays and consequent general losses of thermal and mechanical performance. The rearrangement into crystalline fractions of shorter chains provoked by hygrothermal ageing was qualitatively and quantitatively followed by both Fourier-Transform Infrared Spectroscopy and Differential Scanning Calorimetry. The microstructural changes were monitored by the cold-crystallization temperature, the crystallinity degree XC and the absorbance intensity ratio I921/I955. A Weibull model showed that the crystallites were formed faster at higher reprocessing cycles and at lower hygrothermal ageing temperatures. All these effects were particularly significant for PLA reprocessed more than one time.
dc.language.iso	eng
dc.relation.ispartof	Polymer Degradation and Stability, 2012, vol. 97, num. 10, p. 1881-1890
dc.subject	Solucions polimèriques
dc.subject	Termoplàstics
dc.title	Hygrothermal ageing of reprocessed polylactide
dc.type	journal article	es_ES
dc.date.updated	2019-10-21T13:43:59Z
dc.identifier.doi	10.1016/j.polymdegradstab.2012.06.001
dc.identifier.idgrec	134917
dc.rights.accessRights	open access	es_ES