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Properties of blends of amorphous and semicrystalline <scp>PLAs</scp> containing multiwalled carbon nanotubes

Mojtaba Mohammadi, Mohammadreza Nofar and Pierre Carreau

Article (2024)

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Abstract

Blend nanocomposites of amorphous polylactide (aPLA) and semicrystalline PLA (scPLA)-multiwalled carbon nanotubes (MWCNTs) were prepared by a twin-screw extruder below the melting temperature of the scPLA. The maximum weight percent of MWCNTs in the blends was 0.9 wt.%. The extrudates were either pelletized immediately or after drawing at a drawing ratio of about 10. According to small amplitude oscillatory shear rheological analysis, the rheological properties of the aPLA/scPLA (85/15 wt.%) drawn sample were significantly increased compared to the undrawn samples. With the presence of MWCNTs, more crystallites could develop in the scPLA, and the electrical conductivity of the aPLA/scPLA nanocomposites was reduced due to the encapsulation of MWCNTs within the crystallites of scPLA. Increasing the temperature during compression moulding to 190°C, which is above the melting temperature of the scPLA, effectively removed this obstacle and the electrical conductivity was increased by a factor of up to 106 compared to the samples moulded at 150°C.

Uncontrolled Keywords

amorphous polylactide (aPLA); electrical properties; multiwalled carbon nanotubes(MWCNTs); PLA blend nanocomposites; rheological properties; semicrystalline PLA(scPLA); thermal properties

Subjects: 1800 Chemical engineering > 1800 Chemical engineering
Department: Department of Chemical Engineering
Research Center: CREPEC - Center for Applied Research on Polymers and Composites
Funders: NSERC / CRSNG, İstanbul Technical University Scientific Research Project (ITU-BAP)
Grant number: 43627
PolyPublie URL: https://publications.polymtl.ca/59137/
Journal Title: The Canadian Journal of Chemical Engineering
Publisher: Wiley Blackwell
DOI: 10.1002/cjce.25463
Official URL: https://doi.org/10.1002/cjce.25463
Date Deposited: 04 Sep 2024 15:39
Last Modified: 26 Sep 2024 22:07
Cite in APA 7: Mohammadi, M., Nofar, M., & Carreau, P. (2024). Properties of blends of amorphous and semicrystalline <scp>PLAs</scp> containing multiwalled carbon nanotubes. The Canadian Journal of Chemical Engineering, 25463 (12 pages). https://doi.org/10.1002/cjce.25463

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