Effect of printing parameters on tensile, thermal and structural properties of 3D‐printed poly (ether ketone ketone) PEKK material using fused deposition modeling

Abstract

AbstractPoly(ether ketone ketone) (PEKK) is a thermoplastic of the poly(aryl ether ketone) (PAEK) family, with excellent mechanical and thermal performances and high chemical resistance properties. This makes it an appealing material in high‐performance applications as a replacement for poly (ether ether ketone) (PEEK). PEKK was thus selected in this study as a base material for application in 3D printing. The effects of nozzle temperature, layer orientation and layer thickness on the final properties of 3D‐printed PEKK parts were investigated. Furthermore, we assessed the mechanical and morphological features of printed samples through tensile tests and scanning electron microscope, respectively. Thermal properties of samples were also evaluated through DSC and DMA analysis. Optimum printing parameters were found at 0.15 mm layer thickness, 380°C nozzle temperature, and [45/−45°] layer orientation. The printed PEKK samples were annealed at various temperatures to allow the relaxation of residual stress and enhance the degree of crystallinity. Samples annealed for 1 h at 240°C have shown an improved elastic modulus by ~14%, tensile strength by 17%, and glass transition temperature by 17.2°C from the increased by 24% degree of crystallinity.