Study On The Influence Of Environmental Stability Of Pvdf Films Modified By PANI And MWCNT

In this paper, PVDF was chosen as the polymer matrix, while the PANI and MWCNT were the filler. The PVDF/PANI, PVDF/MWCNT, PVDF/PANI/MWCNT composite films were put into the VUV environment, AO environment, and collaborative environment to carry out the ground simulation test. By the research of their electrical properties, mechanical properties, crystal structures and surface morphology etc, it was essential to discuss the influence of the space irradiation to the mass loss, properties and structures of the composite films.The experimental results showed that the mass loss of the PVDF/PANI composite films under space irradiation increased. Their mechanical properties deteriorated and the breaking strength decreased. VUV and AO irradiation made the dielectric permittivity decreased, but dielectric loss and electrical conductivity increased. However, the collaborative irradiation between VUV and AO made the dielectric permittivity reduced,while the dielectric loss and electrical conductivity of the composite films decreased with the increase of the irradiation time.When the space irradiation finished, the mass loss of PVDF/MWCNT composite films was less than the mass loss of PVDF/PANI at the same time. Their mechanical properties deteriorated and the breaking strength decreased. Under space irradiation, the relative intensity of the diffraction peaks of crystal phases decreased, and their surface morphology changed. The effect of VUV irradiation made the dielectric permittivity,dielectric loss and electrical conductivity increased while the AO irradiation and the collaborative irradiation made them be less than the original films.Compared with other two films, the mass loss of PVDF/PANI/MWCNT films was in the middle. Under VUV irradiation or AO irradiation, the dielectric permittivity,dielectric loss and electrical conductivity decreased, and the mechanical properties deteriorated. There were some holes and folds in the surface of these films. The collaborative irradiation accelerated the changes of the composite films’ surface morphology. The surface was more rough, even appeared many cracks and white spots.The dielectric permittivity increased while the dielectric loss and electrical conductivitydecreased when the irradiation finished.