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Effect of sisal and hydrothermal ageing on the dielectric behaviour of polylactide/sisal biocomposites
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. Prince of Songkla University, Thailand.
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2017 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 149, 1-10 p.Article in journal (Refereed) Published
Abstract [en]

The dielectric properties of virgin polylactide (PLA) and its reinforced composites with different weight amounts of sisal fibres were assessed at broad temperature (from −130 °C to 130 °C) and frequency ranges (from 10−2–107 Hz), before and after being subjected to accelerated hydrothermal ageing. The synergetic effects of both the loading of sisal and hydrothermal ageing were analysed by means of dielectric relaxation spectra. The relaxation time functions were evaluated by the Havriliak-Negami model, substracting the ohmic contribution of conductivity. The intramolecular and intermolecular relaxations were respectively analysed by means of Arrhenius and Vogel-Fulcher-Tammann-Hesse thermal activation models. The addition of fibre increased the number of hydrogen bonds, which incremented the dielectric permittivity and mainly hindered the non-cooperative relaxations of the biocomposites by increasing the activation energy. Hydrothermal ageing enhanced the formation of the crystalline phase at the so-called transcrystalline region along sisal. This fact hindered the movement of the amorphous PLA fraction, and consequently decreased the dielectric permittivity and increased the dynamic fragility.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 149, 1-10 p.
Keyword [en]
Biocomposites, Crystallinity, Degradation, Dielectric spectroscopy, Dynamic fragility, Hydrothermal ageing, Natural fibre, poly(lactide) (PLA), Segmental cooperativity, Sisal
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-209498DOI: 10.1016/j.compscitech.2017.05.026ISI: 000408286600001Scopus ID: 2-s2.0-85020314243OAI: oai:DiVA.org:kth-209498DiVA: diva2:1112985
Note

QC 20170621

Available from: 2017-06-21 Created: 2017-06-21 Last updated: 2017-09-12Bibliographically approved

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