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Triethyl citrate (TEC) as a dispersing aid in polylactic acid/chitin nanocrystal nanocomposites prepared via liquid-assisted extrusion
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. (Trä och bionanokompositer)
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. (Trä och bionanokompositer)
University of the Basque Country.
University of the Basque Country.
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(English)In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840Article in journal (Refereed) Submitted
Abstract [en]

Polylactic acid/chitin nanocrystal (PLA/ChNC) nanocomposites with triethyl citrate (TEC) at varied concentrations (2.5, 5.0 and 7.5 wt%) were prepared using liquid-assisted extrusion. The goal was to find the minimum amount of the TEC plasticizer needed to enhance ChNC dispersion. The microscopy study showed that the dispersion and distribution of the ChNC into PLA improved with the increasing TEC content. Hence, the nanocomposite with the highest plasticizer content (7.5 wt%) showed the highest optical transparency and improved thermal and mechanical properties compared with its counterpart without the ChNC. Gel permeation chromatography confirmed that the water and ethanol used during the extrusion did not degrade PLA. Further, Fourier transform infrared spectroscopy showed improved interaction between PLA and ChNC through hydrogen bonding when TEC was added. All results confirmed that the plasticizer plays an important role as a dispersing aid in the processing of PLA/ChNC nanocomposites.

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Composite Science and Engineering
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URN: urn:nbn:se:ltu:diva-64861OAI: oai:DiVA.org:ltu-64861DiVA: diva2:1123805
Available from: 2017-07-13 Created: 2017-07-13 Last updated: 2017-07-13
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