In DLP, each layer of the resin is exposed all at once to the light source and then cured simultaneously. This approach includes Stereolithography (SLA) and Digital Light Processing (DLP). Īmong the different 3D printing technologies, the photochemical approach is extremely attractive as objects can be produced via photopolymerization reactions of monomers/oligomers, which possess environmental, economic and production benefits. In this way, the use of 3D printing technologies in electronics has great potential since it allows the integration of sensors, conductors, devices with different electronic functions, etc., in the manufacturing process of three-dimensional objects at an affordable cost, while maintaining freedom in design.
Therefore, more research is required on providing materials with new features with the minimum environmental cost, as demanded by today’s society. However, one of the major drawbacks of AM remains-its limited materials selection portfolio, with low availability of high-performance materials with specific properties.
The mechanical properties of the acrylic matrix are maintained in the composites, confirming the viability of these simple, low-cost, conductive composites for applications in flexible electronic devices.Īdditive manufacturing (AM) or 3D printing technologies are gaining importance in the industry due to the new production models that establish the paradigms of Industry 4.0. The optimal photoinitiator concentration was found between 6 and 7 wt%. Higher PANI loadings hinder printing quality without improving electrical conductivity. In the working conditions, the maximum amount of PANI embedded within the resin was ≃3 wt% with a conductivity of 10 −5 S cm −1, three orders of magnitude higher than the pure resin. The adjustment of the layer thickness according to cure depth values ( C d) allows printing of most formulations, except those with the highest gel point times determined by photorheology. In this work, photorheology, in combination with Jacobs working curves, efficaciously predict the printability of polyaniline (PANI)/acrylate formulations with different contents of PANI and photoinitiator. There is need for developing novel conductive polymers for Digital Light Processing (DLP) 3D printing.
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