Abstract
The present work reports on the production and characterization of acrylonitrile butadiene styrene (ABS) hybrid nanocomposite filaments incorporating graphene nanoplatelets (GNPs) and carbon nanotubes (CNTs) suitable for fused filament fabrication (FFF). At first, nanocomposites with a total nanofiller content of GNP and/or CNT of 6 wt.% and a GNP/CNT relative percentage ratio of 0, 10, 30, 50, 70, and 100 were produced by melt compounding and compression molding. Their mechanical, electrical resistivity, and electromagnetic interference shielding effectiveness (EMI SE) properties were evaluated. The hybrid nanocomposites showed a linear increase in modulus and decrease in strength as a function of GNP content; on the other hand, the addition of CNT in hybrid nanocomposites determined a positive increase in electrical conductivity, but a potentially critical decrease of melt flow index. Due to the favorable compromise between processability and enhancement of performance (i.e., mechanical and electrical properties), the hybrid composition of 50:50 GNP/CNT was selected as the most suitable for the filament production of 6 wt.% carbonaceous nanocomposites. EMI SE of ABS-filled single CNT and hybrid GNP/CNT nanofillers obtained from compression molding reached the requirement for applications (higher than −20 dB), while slightly lower EMI SE values (in the range −12/−16 dB) were obtained for FFF parts dependent on the building conditions.
Highlights
Polymer nanocomposites with carbonaceous nanomaterial reinforcements are extensively investigated due to their remarkable performance including mechanical, electrical, and thermal properties
The manufacture of the nanocomposites with a total amont of 6 wt.% of graphene nanoplatelets (GNPs)/carbon nanotubes (CNTs) nanofiller was performed by direct melt compounding, and various samples with different compositions were produced either by compression molding or by filament extrusion
The GNP/CNT hybrid nanocomposites showed values of elastic modulus, strength, electrical resistivity, and processability intermediate to those manifested by nanocomposites filled with either GNP or CNT
Summary
Polymer nanocomposites with carbonaceous nanomaterial reinforcements are extensively investigated due to their remarkable performance including mechanical, electrical, and thermal properties. The use of nanomaterials can offer extraordinary structural and functional properties of polymers that can be tailored for broad application in many fields, but sometimes requires an adequate optimization of material processability. The nanocomposites could help the development of lightweight structural materials with functionalities that can be utilized for electronic components, micro-batteries, circuits, and electromagnetic shielding [1,2,3,4,5]. The extensive global development of novel electronic devices in many fields such as industrial, household, medical, science, military, and telecommunication cause electromagnetic pollution. Shielding is necessary for preventing electronics from undesired electromagnetic radiations associated with strategic
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