Microwave dielectric properties of polytetrafluoroethylene-polyacrylate composite films made via aerosol deposition

作者：O'Keefe Shamus; Luscombe Christine K^*

来源：Polymer International, 2016, 65(7): 820-826.

DOI：10.1002/pi.5138

• permittivity
• loss tangent
• microwave
• nanocomposite
• dielectric

Few studies have examined the deposition of polytetrafluoroethylene (PTFE) using additive manufacturing and their subsequent properties in microwave devices. The present study examines polytetrafluoroethylene-polyacrylate (PTFE-PA) composite films made via aerosol deposition to assess the potential use of PTFE in additive manufacturing processes. The composites are composed of PTFE-PA core-shell nanoparticles, synthesized using a seeded emulsion polymerization, containing various PTFE weight fractions up to 50%. The synthesized nanoparticles were sprayed onto a heated glass substrate and subsequently annealed at a temperature above the glass transition temperature of PA and below that of PTFE, rendering a solid film approximately 40 mu m thick. A cavity perturbation resonance technique was employed to determine the complex permittivity of the films. As the volume fraction of PTFE increased, the real part of the permittivity E decreased while the imaginary part of the permittivity E showed little variation. The results demonstrate a promising approach for incorporating PTFE into additive manufacturing processes, particularly for microwave devices.

• 出版日期2016-7