Multiscale characterisation of the electrical response of 3d printed carbon black polylactic acid
D. Robin, Noble Thomas, Laurane Roumy, Fernandez Toribio Juan Carlos, Robert Colin, Truong Hoang Thuy Quynh, Martinez Hergueta Francisca
Abstract
Abstract In this paper, the electrical response of a carbon black polylactic acid 3D printed polymer is characterised in detail by a combination of advanced experimental techniques at different scale lengths. The electrical properties as a function of the temperature become repeatable after the second heating cycle, exhibiting different trends as a function of the printing parameters. Joule heating and oven-heating techniques have been compared, showing the advantages of the Joule heating method to maintain electrical conductivity due to the lower thermal inertia. Small-Angle X-Ray Scattering has been employed to discern the underlying physics, showing the crucial role of crystallinity, filler dispersion and carbon black aggregates to form an effective segregated conductive network. This investigation provides guidelines to produce 3D-printed devices with a reliable electrical response and the governing equations to operate them with sufficient accuracy for engineering applications. Graphical abstract