Since the world’s interest in the transition to a circular economy has started to grow, researchers have made an effort to create and characterise recycled materials. As the use of carbon fibre reinforced polymers increases over the years, recycling and re-manufacturing processes are essential to limit waste and minimise their environmental impact. The reclamation, recycling and remanufacturing of carbon fibre reinforced polymer composites has already been studied and documented in literature . In combination with a recycled polymer, one can produce an environmentally and economically interesting product. The recycling of poly(ethylene terephthalate) in particular is already a soundly established process in the polymer recycling industry.
Re-manufacturing through additive manufacturing could improve mechanical properties compared to conventional re-manufacturing methods, as the degrees of freedom provided by a 3D printer can be exploited. The mechanical performance of printed parts however is dependent on the adhesion between adjacent deposited filaments.Since the level of entanglement of polymer chains from one filament to the other depends on temperature, the combination of the extrusion temperature and build plate temperature are important processing parameters. For example, Hertle et al. have reported that the contact temperature between substrate and newly extruded filament should be in the vicinity of the melting temperature of the semi-crystalline polymer . The melting of the polymer in the area of contact between substrate and extruded filament allows for a higher level of interdiffusion, leading to a higher level of load transfer, and thereby increasing mechanical performance.
This work investigates the influence of the build plate temperature on the tensile properties of recycled carbon fibre-reinforced recycled poly(ethylene terephthalate) composite parts,printed using the extrusion-based printing technique fused filament fabrication, also known as fused deposition modelling.
The influence of the build plate temperature on the tensile strength and stiffness of the material was determined by comparing specimens printed on a plate at a temperature above and below the glass transition temperature of the polymer matrix, holding all other printing and material parameters constant. It was found that samples printed using a build plate temperature of 100°C showed no significant difference in stiffness, nor failure stress, compared to the samples printed using a build plat etemperature of 40°C. Raising the build plate temperature above the glass transition temperature of the polymer thus had no influence on the investigated tensile properties of the samples.
The authors wish to thank SIM for their support of the SBO project RELFICOM, running in the NANOFORCE Program.
 S. Pimenta and S. T. Pinho, “Recycling carbon fibre reinforced polymers for structural applications: Technology review and market outlook,” Waste Manag., vol. 31, no. 2, pp. 378–392, 2011.
 S. Hertle, M. Drexler, and D. Drummer, “Additive Manufacturing of Poly(propylene) by Means of Melt Extrusion,” Macromol.Mater. Eng., vol. 301, no. 12, pp. 1482–1493, 2016.
|Status||Unpublished - 9 dec 2019|
|Evenement||FiBreMoD school and conference 2019: Fibre Break Models for Designing novel composite microstructures and applications - Aula of the Second Law, KU Leuven, (Kasteelpark Arenberg 41, 3001 Leuven, Belgium), Leuven, Belgium|
Duur: 9 dec 2019 → 12 dec 2019
|Conference||FiBreMoD school and conference 2019|
|Periode||9/12/19 → 12/12/19|