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Preparation and Characterization of 3D Printed PLA-Based Conductive Composites Using Carbonaceous Fillers by Masterbatch Melting Method

1
Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China
2
Mechanical and Energy Engineering Department, University of North Texas, Denton, TX 76201, USA
3
College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(10), 1589; https://doi.org/10.3390/polym11101589
Received: 20 August 2019 / Revised: 20 September 2019 / Accepted: 26 September 2019 / Published: 29 September 2019
This study was aimed at improving the conductivity of polylactic acid (PLA)-based composites by incorporating carbonaceous fillers. The composites with the addition of graphene nanoplatelets (rGO) or multi-walled carbon nanotubes (MWCNTs) were fabricated by the masterbatch melting method in order to improve the dispersion of the two kinds of nano-fillers. The results showed that, with the addition of 9 wt % rGO, the volume electrical resistivity of the composite reached the minimum electrical resistance of 103 Ω·m, at which point the conductive network in the composites was completely formed. The interfacial compatibility, apparent viscosity, and the thermal stability of the composite were also good. The rGO functionalized by sodium dodecylbenzene sulfonate (SDBS) was an efficient method to further improve the electrical conductivity of the composite, compared with tannic acid and MWCNTs. The resistivity was reduced by an order in magnitude. Patterns printed onto different baseplates by fused deposition modeling illustrated that the functionalized composite had certain flexibility and it is suitable for printing complex shapes. View Full-Text
Keywords: polylactic acid; polymeric composites; masterbatch melting method; graphene nanoplatelets; electrical conductivity; fused deposition modeling polylactic acid; polymeric composites; masterbatch melting method; graphene nanoplatelets; electrical conductivity; fused deposition modeling
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Guo, R.; Ren, Z.; Jia, X.; Bi, H.; Yang, H.; Ji, T.; Xu, M.; Cai, L. Preparation and Characterization of 3D Printed PLA-Based Conductive Composites Using Carbonaceous Fillers by Masterbatch Melting Method. Polymers 2019, 11, 1589.

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