Dielectric properties ofPoly(methyl methacrylate) (PMMA)/CaCu3Ti4012 Composites (original) (raw)
Related papers
Fabrication and Characterization of Poly(methyl methacrylate)/CaCu 3 Ti 4 O 12 Composites
Composites comprising Poly(Methyl Methacrylate) (PMMA) and CaCu 3 Ti 4 O 12 (CCTO) via melt mixing followed by hot pressing were fabricated. These were characterized using X-ray diffraction, thermo gravimetric, scanning electron microscopy, and Impedance analyzer for their structural, morphology, and dielectric properties. Composites were found to have better thermal stability than that of pure PMMA. The composite, with 38 Vol % of CCTO (in PMMA), exhibited remarkably low dielectric loss at high frequencies and the low frequency relaxation is attributed to the space charge polarization/ MWS effect. Theoretical models were employed to rationalize the dielectric behavior of these composites. At higher temperatures, the relaxation peak shifts to higher frequencies, due to the merging of both b and a relaxations into a single dielectric dispersion peak. The AC conductivity in the high frequency region was attributed to the electronic polarization. POLYM. ENG. SCI., 54:551-558, 2014. ª
Your article is protected by copyright and all rights are held exclusively by Akadémiai Kiadó, Budapest, Hungary. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".
2019
Nanocomposites based on polyethyl methacrylate (PEMA) and polyvinyl chloride with different materials (Barium zirconate (BaZrO3), silicon dioxide (SiO2), and MMT etc) had been prepared. Scanning electron microscope (SEM) has been used for morphological characterization of PEMA/BaZrO3, PVC/MMT, PVC/SiO2 and PVC/MMT/SiO2 nanoparticles in order to confirm the nano-dispersion and their effect on morphology changes in PEMA and PVC matrix. Various properties primarily based on these substances were investigated by way of dielectric characteristics. The dielectric traits were strongly prompted via a spread of the nanoparticles and might be analysed using the frequency and temperature based interfacial relaxation. The maximum value of energy density for PEMA+6wt.% BaZrO3 nanocomposite at room temperature as compare to PVC nanocomposites has been observed. These efficient polymeric matrices based nanocomposites could be applied as efficient dielectric materials in the various electronic applications.
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.
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.
High Dielectric Constant Polymer Ceramic Composites
MRS Proceedings, 1999
A new polymer-ceramic composite, using the newly developed relaxor ferroelectric polymer that has a high room temperature dielectric constant as the matrix, is reported. Different kinds of ceramic powders were studied and homogeneous composite thin films (20μm) were fabricated. It was observed that the increase of the dielectric constant of the composites with the ceramic content could be described quite well by the expression developed by Yamada et al., when the ceramic content is below 60% by volume. The experimental data shows that the relative dielectric constant of composites using PMN-PT powders can reach more than 250 with weak temperature dependence (i.e., the dielectric constant changes little in a broad temperature range). In addition to high permittivity, the composite prepared in clean environment also has high breakdown field strength (120MV/m), which yields an energy storage density more than 14J/cm3. The dielectric behavior of the composite at various frequencies was ...
Studies of Dielectric Constant of Some Polymer/Ceramic Composite Materials: A Conformational Study
Polymer/ceramic composites are the most promising embedded capacitor material for organic substrates application. Predicting the effective dielectric constant of polymer/ceramic composites is very important for design of composite materials. In the present paper the dielectric constant has been evaluated by various mixing rules/models for polymer-ceramic composites and compared with experimental values taken from literature. Results have been discussed on the basis the value of average percentage deviation of dielectric constant.
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.
Dielectric Constant of nano-CCTO / Epoxy Composite
Nanocrystalline multiphase CaCu 3 Ti 4 O 12 (CCTO) was prepared using Ca(NO 3 ) 2 .4H 2 O, Cu(NO 3 ) 2 .3H 2 O, TiO 2 and C 2 H 2 O 4 .2H 2 O. The X-Ray differection and SEM analysed of the prepared CCTO powder sintered at 900 o C and 950 o C.