Preparation, Characterization, and Dielectric Properties of PP/CaTiO₃ Composites for Microwave Substrate Applications

Abstract

Calcium titanate (CaTiO3) filled polypropylene (PP) composites have been fabricated through compression molding method. The phase purity of the PP/CaTiO3 composites was studied using X‐ray diffraction studies. Scanning electron microscopy technique has been employed to study the dispersion of the particulate filler in the PP matrix. The dielectric constant and loss tangent of the composites were measured at X‐band frequency region using waveguide cavity perturbation technique. PP/CaTiO3 composite has an effective dielectric constant of 11.74 and loss tangent 0.007 at optimum filler loading. The experimental dielectric constant of filled composites was compared with theoretically predicted dielectric constant values obtained using different modeling approaches. The linear coefficient of thermal expansion of PP/CaTiO3 composites was studied using thermomechanical analyzer.

The Effects of Concentration and Particle Size of TiO2 on the Dielectric Properties of Polyolefin‐Based Microwave Substrates

“…TiO 2 is an important filler in ceramic‐polymer systems owing to the high dielectric constant (∼ 100) and fantastic thermal stability . The dielectric properties of the composites are closely related to the mass fraction, particle size and morphology of the fillers . Therefore, composites with tailored dielectric properties can be obtained by varying the fillers.…”

Investigation of Structural and Optical Characteristics of Biopolymer Composites Based on Polyvinyl Alcohol Inserted with PbS Nanoparticles

“…These OH groups provide hydrogen bonding, which facilitates the development of polymer composites [1]. From a practical standpoint, nano-filled polymers as hybrid materials gather all the desired properties of the polymer and the filler to produce substrates for microwaves [17], an electrolyte for fuel cells [18], an adsorptive photocatalyst [19], a supercapacitor [20], and humidity sensors [21].…”