Abstract
This paper investigated a polymer-based composite by homogeneously embedding calcium copper titanate (CaCu3Ti4O12; CCTO) fillers into a polytetrafluoroethylene matrix. We observed the composite filled by CCTO powder at different sizes. The particle size effects of the CCTO filling, including single-size particle filling and co-blending filling, on the microstructure and dielectric properties of the composite were discussed. The dielectric performance of the composite was investigated within the frequency range of 100 Hz to 1 MHz. Results showed that the composite filled by micron/submicron-blended CCTO particles had the highest dielectric constant (εr = 25.6 at 100 Hz) and almost the same dielectric loss (tanδ = 0.1 at 100 Hz) as the composite filled by submicron CCTO particles at the same volume percentage content. We researched the theoretical reason of the high permittivity and low dielectric loss. We proved that it was effective in improving the dielectric property of the polymer-based composite by co-blending filling in this experiment.
Highlights
Substrate materials have gained considerable attention because of their roles in the continuous development of the high-technology electronic industry [1]
Ceramic/polymer composites, in which particles with high dielectric permittivity are used as fillers and polymers are used as the matrix, combine the merits of ceramics and polymers with high dielectric permittivity and excellent mechanical properties
Compared with CCTO/polyvinylidene fluoride (PVDF) composites, which have been widely studied, our results show lower losses, which indicate these filled CCTO/PTFE materials can be applied to fields requiring high dielectric constants and low losses, such as substrate materials
Summary
Substrate materials have gained considerable attention because of their roles in the continuous development of the high-technology electronic industry [1] Traditional polymer materials, such as polytetrafluoroethylene (PTFE) [2,3] and epoxy [4], are flexible and can be produced by a simple process. Ceramic/polymer composites, in which particles with high dielectric permittivity are used as fillers and polymers are used as the matrix, combine the merits of ceramics and polymers with high dielectric permittivity and excellent mechanical properties. These composites exhibit potential for various applications [8,9,10,11]. The dielectric mechanism of the PTFE/CCTO composite is discussed in detail
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