Fabrication, Mechanical and Dielectric Characterization of 3D Orthogonal Woven Basalt Reinforced Thermoplastic Polyimide Composites
The 3D orthogonal woven basalt fiber reinforced polyimide (PI) composites were fabricated and characterized in this study. The PI film was firstly prepared to determine PI processing parameters. Fourier transform infrared (FTIR) analysis showed that 300°C was the suitable imidization temperature. Thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) results showed relatively good thermal properties of the PI film. In the fabrication of composites, the multi-step impregnation method was applied. The bending properties of 3 mm-thick composite showed increasing trend in all and the second-time impregnated composite had much higher value than the first-time impregnated composite. Moreover, the bending fracture mode photos showed obvious creases except for the first-time impregnated materials, which agreed well with the bending property values. The dielectric constants for the composites were complex because they had not regular value following the mixing rule of the composites, which was mainly due to the interfacial polarization and other effects in the fabrication processing.
Influence of thermal aging on the transverse tensile creep response of a carbon fiber/thermoplastic polyimide composite
The effects of thermal aging on the transverse tensile creep compliance and creep rupture of carbon fiber reinforced AVIMID K3B composites are reported. For aging times ofup to 1,000 hours and a temperature as high as 200°C, the aging characteristics were primarily physical in nature (as opposed to chemical aging). The aging shift rates were determined from linear viscoelastic tests, and the creep rupture times were determined for the nonlinear regime.
Wear of polymers
Vitesse d'usure d'un polyethersulfane frottant contre de l'acier en presence de solvants organiques dans des conditions de lubrification limite