Preparation, structures and properties of interpenetrating network structure-type Phosphate/PEEK composites with enhanced compressive strength and high temperature resistance

Abstract

Phosphate/polyether ether ketone (PEEK) composites were successfully prepared by molding method and thermal treating at the temperature of 360 °C. The structures and compositions of phosphate/PEEK composites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, differential scanning calorimetry and scanning electron microscopy. The mechanical properties thermal resistance and dielectric properties were strictly evaluated by the mechanical testing, thermogravimetric analysis and dielectric constant analysis. As the results, the interpenetrating network structure (IPNS) of Al2O3-phosphates was completely formed in PEEK matrix. And the phosphate/PEEK composite with 40% Al2O3-phosphate showed a 15.9% increasing for tensile strength and 74.5% increasing for compressive strength at room temperature. Besides, the phosphate/PEEK composite with 80 wt% Al2O3-phosphate dispalyed a dielectric constant of 4.0, a dielectric loss of 0.0601 and a Shore hardness of 91 HD. As the structural materials, these composites would exhibited the potential applications in aviation, aerospace and other fields.