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Impact of hydrothermal ageing on the thermal stability, morphology and viscoelastic performance of PLA/sisal biocomposites

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Impact of hydrothermal ageing on the thermal stability, morphology and viscoelastic performance of PLA/sisal biocomposites

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dc.contributor.author	Gil Castell, O.
dc.contributor.author	Badia Valiente, José David
dc.contributor.author	Kittikorn, T.
dc.contributor.author	Strömberg, E.
dc.contributor.author	Ek, M.
dc.contributor.author	Karlsson, S.
dc.contributor.author	Ribes Greus, A.
dc.date.accessioned	2019-10-21T12:56:08Z
dc.date.available	2019-10-21T12:56:08Z
dc.date.issued	2016
dc.identifier.citation	Gil Castell, O. Badia Valiente, José David Kittikorn, T. Strömberg, E. Ek, M. Karlsson, S. Ribes Greus, A. 2016 Impact of hydrothermal ageing on the thermal stability, morphology and viscoelastic performance of PLA/sisal biocomposites Polymer Degradation and Stability 132 87 96
dc.identifier.uri	https://hdl.handle.net/10550/71778
dc.description.abstract	The influence of the combined exposure to water and temperature on the behaviour of polylactide/sisal biocomposites coupled with maleic acid anhydride was assessed through accelerated hydrothermal ageing. The biocomposites were immersed in water at temperatures from 65 to 85 C, between the glass transition and cold crystallisation of the PLA matrix. The results showed that the most influent factor for water absorption was the percentage of fibres, followed by the presence of coupling agent, whereas the effect of the temperature was not significant. Deep assessment was devoted to biocomposites subjected to hydrothermal ageing at 85 C, since it represents the extreme degrading condition. The morphology and crystallinity of the biocomposites were evaluated by means of X-Ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The viscoelastic and thermal performance were assessed by means of dynamic mechanic thermal analysis (DMTA) and thermogravimetry (TGA). The presence of sisal generally diminished the thermal stability of the biocomposites, which was mitigated by the addition of the coupling agent. After composite preparation, the effectiveness of the sisal fibre was improved by the crystallisation of PLA around sisal, which increased the storage modulus and reduced the dampening factor. The presence of the coupling agent strengthened this effect. After hydrothermal ageing, crystallisation was promoted in all biocomposites therefore showing more fragile behaviour evidencing pores and cracks. However, the addition of coupling agent in the formulation of biocomposites contributed in all cases to minimise the effects of hydrothermal ageing.
dc.language.iso	eng
dc.relation.ispartof	Polymer Degradation and Stability, 2016, vol. 132, p. 87-96
dc.subject	Solucions polimèriques
dc.subject	Termoplàstics
dc.title	Impact of hydrothermal ageing on the thermal stability, morphology and viscoelastic performance of PLA/sisal biocomposites
dc.type	journal article	es_ES
dc.date.updated	2019-10-21T12:56:09Z
dc.identifier.doi	10.1016/j.polymdegradstab.2016.03.038
dc.identifier.idgrec	118605
dc.rights.accessRights	open access	es_ES