The growing popularity of Poly lactic acid (PLA) is related to its biocompatibility, good mechanical properties, and its synthesis from renewable resources. PLA can be compounded with electrically conductive fillers (e.g., carbon nanotubes (CNTs)) to form carbon polymer composites (CPC). These fillers provide the conductive functionality by forming percolative paths. Featuring very low weight densities, CPCs have the potential to replace metals in the electronic industry if they exhibit similar electrical conductivities. The current challenges being faced during the mixing of CNTs in a polymer matrix are the formation of aggregates due to the strong van der Waals forces and the breakage of the CNTs during dispersion. In this study, we compare: (1) two fabrication methods to create CPCs (i.e., solution mixing by sonication and extrusion) and (2) effects of various CNT functionalization techniques (i.e., acid and plasma treatments) on the conductivity of the CPCs. First, the composites comprising of 30% PLA by weight in Dichloromethane (DCM) and CNTs in different concentrations (up to 5wt.%) are fabricated by two step sonication method (i.e., dissolving PLA in DCM and then dispersing the CNTs in the polymer solution). Second, CPCs are fabricated using a micro twin screw extruder operating at 180°C. To verify the effects of functionalization of the CNTs on the conductivity of composites, the CNTs are functionalized via three methods: - HNO3 acid functionalization, 3:1 ratio HNO3 + H2SO4 acid (stronger) functionalization and N2 plasma functionalization. CPC fibers are drawn using the solvent-cast printing method. These fibers are then tested for their electrical conductivity using the two probe method. The maximum electrical conductivity is showed by the 5% CNT concentration samples at 3.97 S/m and 25.16 S/m for the CPC fibers obtained via the solution blend and the extrusion methods, respectively. Regarding the functionalized CNTs, conductivity measurements show a negative effect of the CNTs functionalization on the electrical properties of the CPC.
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ASME 2014 International Mechanical Engineering Congress and Exposition
November 14–20, 2014
Montreal, Quebec, Canada
Conference Sponsors:
- ASME
ISBN:
978-0-7918-4644-5
PROCEEDINGS PAPER
Investigation of Carbon Nanotubes Mixing Methods and Functionalizations for Electrically Conductive Polymer Composites
Brijpal Singh Talwar,
Brijpal Singh Talwar
École Polytechnique de Montréal, Montréal, QC, Canada
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Kambiz Chizari,
Kambiz Chizari
École Polytechnique de Montréal, Montréal, QC, Canada
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Shuangzhuang Guo,
Shuangzhuang Guo
École Polytechnique de Montréal, Montréal, QC, Canada
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Daniel Therriault
Daniel Therriault
École Polytechnique de Montréal, Montréal, QC, Canada
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Brijpal Singh Talwar
École Polytechnique de Montréal, Montréal, QC, Canada
Kambiz Chizari
École Polytechnique de Montréal, Montréal, QC, Canada
Shuangzhuang Guo
École Polytechnique de Montréal, Montréal, QC, Canada
Daniel Therriault
École Polytechnique de Montréal, Montréal, QC, Canada
Paper No:
IMECE2014-39970, V02BT02A046; 5 pages
Published Online:
March 13, 2015
Citation
Talwar, BS, Chizari, K, Guo, S, & Therriault, D. "Investigation of Carbon Nanotubes Mixing Methods and Functionalizations for Electrically Conductive Polymer Composites." Proceedings of the ASME 2014 International Mechanical Engineering Congress and Exposition. Volume 2B: Advanced Manufacturing. Montreal, Quebec, Canada. November 14–20, 2014. V02BT02A046. ASME. https://doi.org/10.1115/IMECE2014-39970
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