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Electrically conductive adhesives as the new materials for Fused Filament Fabrication 3D printing process | Abstract
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12013805565

European Journal of Applied Engineering and Scientific Research

Abstract

Electrically conductive adhesives as the new materials for Fused Filament Fabrication 3D printing process

Author(s): Paulina Latko-DuraÅ?ek

Fused Filament Fabrication (FFF) is the most commonly-used and cost-effective way to produce 3D complex shapes from various thermoplastic polymers and their associated composites. In this work, a new type of the electrically conductive copolyamides were adapted to the FFF process. These copolyamides belong to the group of hot melt adhesives which are a mixture of different components such as polymer base, tackifier, resin, wax, additives and have the low melting point between 100-150???C. Here, two types of copolyamides containing 7wt% of multi-walled carbon nanotubes (MWCNTs) were manufactured using twin-screw microextruder. These new filaments possess porosity below 1% and high flexibility without breakage during printing. Although the addition of 7wt% MWCNTs significantly increased the viscosity of the copolyamides, both were printable using the nozzle of 0.6mm and the temperature of around 70???C higher than their melting point. Mechanical properties and electrical conductivity of the filaments were evaluated before and after 3D printing. For this, the filaments were printed using Raise3D Pro2D on 5 different temperatures: 205???C, 215???C, 225???C, 235???C and 245???C. It was found that electrical conductivity is improved with an increase of the nozzle temperature while the tenile strength decreases. Using these thermoplastic adhesives it was possible to print the conductive tracks onto the polymeric fabrics by FFF 3D printing which maintain the conductive properties even during bending. This project was conducted by the support of the Polish National Agency for Academic Exchange (NAWA) in funding under the Bekker programme received by Dr. Paulina Latko-Dura??ek.