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Attaining Toughness and Reduced Electrical Percolation Thresholds in Bio-Based PA410 by Combined Addition of Bio-Based Thermoplastic Elastomers and CNTs

Authors :
G. Guerrica-Echevarría
Itziar Otaegi
Nora Aranburu
Source :
Polymers, Volume 13, Issue 19, Addi. Archivo Digital para la Docencia y la Investigación, instname, Polymers, Vol 13, Iss 3420, p 3420 (2021)
Publication Year :
2021
Publisher :
MDPI, 2021.

Abstract

Multi-walled carbon nanotubes (CNTs) were added to provide electrical conductivity to bio-based polymer blends with improved toughness (based on commercially available Pebax thermoplastic elastomers and bio-based polyamide 4,10). A preliminary study including three different Pebax grades was carried out to select the grade and the composition that would best improve the impact properties of PA410. Thus, tough multiphasic PA/Pebax/CNT nanocomposites (NCs) with enhanced electrical conductivity were obtained. The CNTs were added either: (1) in the form of pristine nanotubes or (2) in the form of a PA6-based masterbatch. Hence, PA410/Pebax/CNT ternary NCs and PA410/PA6/Pebax/CNT quaternary NCs were obtained, respectively, up to a CNT content of 1 wt%. The ternary and quaternary NCs both showed similar mechanical and electrical properties. The electrical percolation threshold decreased with respect to previously studied corresponding NCs without Pebax, i.e., PA410/CNT and PA410/PA6/CNT, due to the partial volume exclusion effect of Pebax over the CNTs that were dispersed mainly in the PA matrix<br />materials with percolation concentrations as low as 0.38 wt% were obtained. With respect to mechanical properties, contrary to the NCs without Pebax, all the PA/Pebax/CNT NCs showed a ductile behavior and impact strength values that were from three to five-fold higher than that of the pure PA410.

Details

Language :
English
Database :
OpenAIRE
Journal :
Polymers, Volume 13, Issue 19, Addi. Archivo Digital para la Docencia y la Investigación, instname, Polymers, Vol 13, Iss 3420, p 3420 (2021)
Accession number :
edsair.doi.dedup.....a675e2e02441f91caf6eec869a6917db