Fabrication and Characterization of Poly(methyl methacrylate)/CaCu 3 Ti 4 O 12 Composites (original) (raw)
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Dielectric properties ofPoly(methyl methacrylate) (PMMA)/CaCu3Ti4012 Composites
Materials with high dielectric constant are in great demand for the miniaturization of electronic devices. More specifically, high dielectric constant polymer-ceramic composites are useful for embedded capacitor applications. A composite consisting of giant dielectric CaCu3 Ti4012 (CCTO) incorporated into the Poly(methyl methacrylate) (PMMA) polymer matrix has been fabricated by melt mixing followed by hot pressing. The composites thus fabricated has been characterised for structural, morphological and dielectric properties. The effective dielectric constant of the composite increased when the CCTO content increased in the PMMA matrix. The dielectric constant permittivity of PMMA is around 4.9 @ 100Hz which has increased to 15.7 @ 100Hz when the ceramic content has increased to 40 Vol %. At low frequency, space charge polarisation is dominant. This composite also exhibited remarkably low dielectric loss at high frequency, which makes this composite a suitable candidate for the capacitors in high frequency application.
Thermal and dielectric performance of Melt processed Polycarbonate /CaCu 3 Ti 4 O 12 composites
Composites comprising Polycarbonate (PC) and CaCu 3 Ti 4 O 12 (CCTO) were fabricated via melt mixing followed by hot pressing by employing both micron (1-7µm) and Nano (75-100 nm) sized crystallites of CCTO. Both the micro and Nano CCTO powders were self-synthesized using solid state and co-precipitation routes respectively.These were characterized using X-ray Diffraction (XRD), Thermo Gravimetric (TGA), Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM),Impedance analyzer for their structural, morphology and dielectric properties. Nanocomposites inducted with nCCTO-50 wt% exhibited better thermal stability than that of pure PC and composite embedded with micron sized CCTO. However, there was no significant difference in the glass transition (T g) temperature between the polymer and the composites. The Nano composites (PC+nCCTO-50 wt%) exhibited 2.5times higher permittivity values as compared to that of composites having 50 vol% micron sized CCTO crystallites.
Effect on dielectric, structural and thermal behaviour of CaCu 3 Ti 4 O 12 in a Nylon 11 matrix
2019
This paper discusses the probability of obtaining high-dielectric permittivity from ceramic-polymer composites by mixing higher dielectric material, CaCu 3 Ti 4 O 12 (CCTO) in a Nylon 11 matrix by the melt-mixing method. The volume percentage of addition of CCTO micro-particles was from 0 to 20 vol%. The dielectric, structural morphology and thermal properties of the composites were analysed using an impedance analyser, a scanning electron microscope, a differential scanning calorimeter and a thermogravimetric analyser, respectively. The permittivity of 50 vol% of the composite is 12, which is increased to that of virgin Nylon 11 of 5.8. Different theoretical models were employed to rationalize the dielectric behaviour of the composite and found to be accurate with that of the experimental data. The thermal behaviour of the composites was good after the addition of CCTO micro-particles into it. It provides the means to employ the ceramic-polymer composites at low temperature with less permittivity and loss.
Nylon 6,9/CaCu 3 Ti 4 O 12 (CCTO) nanocrystal composites with relatively high dielectric permittivity (220 at 100 Hz) were fabricated by melt mixing followed by hot pressing. The CCTO nanoceramics were synthesized using the oxalate precursor route, and the transmission electron microscopy studies exhibited that the crystallites are in the range of 20–200 nm. The nanocomposites were characterized using X-ray diffraction, scanning electron micros-copy, thermogravimetric analysis, differential scanning calorimetry, and impedance analyzer to study their structural , thermal, and dielectric properties. The introduction of CCTO nanoparticles into the matrix had influenced the thermal properties. The effective dielectric permit-tivity of the nanocomposite increased by the augmentation of CCTO content in the Nylon 6,9. Our experimental outcomes showed that the fixed dielectric permittivity of such two-phase composite was established above 200 when the CCTO concentration was closer to its percolation threshold. The room temperature dielectric permittivity as high as 220 at 100 Hz has been achieved when the CCTO content increased to 58 vol% in the polymer and this was increased to 3845 at 150°C. The increase in AC conductivity with the increase in the CCTO content in the polymer matrix supported the hopping of the charge carrier conduction mechanism.
Dielectric behaviour of CaCu3Ti4O12-epoxy composites
Materials Research-ibero-american Journal of Materials, 2008
The dielectric behavior of composite materials (epoxy resin -barium titanate and epoxy -CCTO) was analysed as a function of ceramic amount. Composites were prepared by mixing the components and pouring them into suitable moulds. In some compositions, the matrix was reduced by tetrahydrofuran (THF) incorporation. Samples containing various amounts of ceramic filler were examined by TG/DTA and scanning electron microscopy analysis. Dielectric measurements were performed from 20 Hz to 1 MHz and 30 to 120 °C. It was demonstrated that the epoxy -CCTO composites possessed higher permittivity than classic epoxy -BaTiO 3 composites. However, the low resin permittivity prevailed in the composite dielectric performance.
Journal of Composites Science
Polymer blend or composite, which is a combination of two or more polymers and fillers such as semiconductors, metals, metal oxides, salts and ceramics, are a synthesized product facilitating improved, augmented or customized properties, and have widespread applications for the achievement of functional materials. Polymer materials with embedded inorganic fillers are significantly appealing for challenging and outstanding electric, dielectric, optical and mechanical applications involving magnetic features. In particular, a polymer matrix exhibiting large values of dielectric constant (ε′) with suitable thermal stability and low dielectric constant values of polymer blend, having lesser thermal stability, together offer significant advantages in electronic packaging and other such applications in different fields. In this review paper, we focused on the key factors affecting the dielectric properties and its strength in thin film of inorganic materials loaded poly methyl meth acryla...
Dielectric composites with a high and temperature-independent dielectric constant
Journal of Advanced Ceramics, 2012
Dielectric composites made using P(VDF-CTFE) 88/12 mol% as polymer matrix and both micro-sized and nano-sized CaCu 3 Ti 4 O 12 (CCTO) particles as filler are developed. These composites exhibit high dielectric constant with a small dielectric loss. More importantly, it is found that the dielectric constant of these composites is almost independent of temperature from 25 ℃ to 125 ℃. Comparing the composites made using micro-sized CCTO particles, the composites made using nano-sized CCTO particles exhibit a smaller dielectric loss. The dielectric properties of these composites indicate that the nano-sized CCTO particles have a smaller dielectric constant than the micro-sized CCTO particles.
2014
Studies on the dielectric constant of CaCu 3 Ti 4 O 12 (CCTO) : PET and CaCu 3 Ti 4 O 12: PVC ceramic polymer composites at varying percentages of the polymers was conducted. CaCu 3 Ti 4 O 12 was prepared by the modified solid state reaction method. The dielectric constant (ε') was measured in the frequency range from 10 Hz to 10 6 Hz and the temperature ranging from 30°C to 300°C with the help of HP 4192A LF Impedance Analyzer. The results showed that the dielectric constants of the sample are frequency and temperature dependent. Dielectric constant decreases with increasing frequency and decreasing temperature due to interfacial polarization Keywords-CaCu 3 Ti 4 O 12, dielectric constant, CCTO : PET and CCTO:PVC I.