scholarly journals Performance Analysis Of Electrical Properties Of Resin Transfer Molded Banana Leaf Reinforced Polymer Composites

2021 ◽  
Vol 23 (10) ◽  
pp. 179-194
Author(s):  
T. Rajamanikandan ◽  
◽  
Dr.S. Banumathi ◽  
Dr.R. Asokan ◽  
◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Polymer Composites ◽  
Volume Resistivity ◽  
Dissipation Factor ◽  
Loading Frequency ◽  
Low Frequencies ◽  
High Frequencies ◽  
Reinforced Polymer ◽  
Fibre Loading ◽  
Banana Leaf

An investigation of the electrical characteristics of banana leaf reinforced Polymer composites made by resin transfer molding (RTM) has been carried out, with special emphasis on the effects of fibre loading, frequency and temperature. Every parameter, including the dielectric constant (ɛ0), dissipation factor (tan δ), loss factor (ɛ00), and conductivity, increases with increasing fibre concentration over the whole frequency range. A minimum fibre content of 50 % is required for composites to achieve excellent performance values. This increase is large at low frequencies, minimal at middle frequencies, and negligible at extremely high frequencies, according to the results of the study. At low frequencies, the volume resistivity fluctuates in response to fibre loading, while at high frequencies, the resistivity blends together. When the temperature rises, the dielectric constant values rise as well, however once the glass transition temperature is reached, the dielectric constant values fall. This fluctuates depending on the amount of fibre present. Finally, an attempt is made to establish a relationship between the experimental value of the dielectric constant and theoretical expectations.

scholarly journals DIELECTRIC BEHAVIOR OF NANO BARIUM TITANATE FILLED POLYMERIC COMPOSITES

2013 ◽  
Vol 22 ◽  
pp. 1-10 ◽  
Author(s):  
A. PRATAP ◽  
N. J. JOSHI ◽  
P. B. RAKSHIT ◽  
G. S. GREWAL ◽  
V. SHRINET
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Barium Titanate ◽  
Polymer Composites ◽  
Hydrothermal Process ◽  
Volume Resistivity ◽  
Polymeric Composites ◽  
Ceramic Materials ◽  
Dissipation Factor ◽  
Dielectric Behavior

Rapid growth of electronic industry requires development of new materials that combine the high dielectric constant intrinsic to ferroelectric ceramic materials with easy processing characteristics of polymers. Ceramic-polymeric composites possess interesting properties for a variety of electronic applications including passive electronic devices. In fact, polymer-ceramic materials have drawn lot attention for use in microelectronic packaging, because they can give higher performance with lower cost, size and weight. In this work, attempts are made to prepare ceramic polymer composites followed by characterization of dielectric properties. The Barium Titanate ceramic powders are synthesized using the hydrothermal process. Crystal structure and crystallite size of particles are determined using X-ray diffraction. Silane treatment is carried out on Barium Titanate powder to increase its compatibility with polymer, followed with preparation of ceramic polymer composites. Epoxy and polyvinyledene fluoride (PVDF) polymers are used as matrices for preparation of the composites. The proportion of nanopowder is varied from 60 to 90 wt%. Dielectric properties such as volume resistivity, dielectric constant, dissipation factor are evaluated. Results indicate that the dielectric constant and dissipation factor vary between 18 -140 and 0.01 to 0.09, respectively as the relative ratio of polymer and silane modified Barium Titanate is varied. Specifically, at 90 wt% of 0.1 wt% silane modified Barium Titanate, the highest dielectric constant of 140 along with dissipation factor of 0.07 is obtained in the epoxy based system.

scholarly journals Диэлектрическая спектроскопия и механизм фазового перехода полупроводник-металл в легированных пленках VO-=SUB=-2-=/SUB=-:Ge и VO-=SUB=-2-=/SUB=-:Mg

2020 ◽  
Vol 54 (4) ◽  
pp. 331
Author(s):  
А.В. Ильинский ◽  
Р.А. Кастро ◽  
М.Э. Пашкевич ◽  
Е.Б. Шадрин
Keyword(s):  
Vanadium Dioxide ◽  
Room Temperature ◽  
Dissipation Factor ◽  
Electrical Circuit ◽  
Low Frequencies ◽  
High Frequencies ◽  
Cole Diagram ◽  
Metal Phase Transition ◽  
Additional Maximum ◽  
Frequency Dependences

Abstract The frequency dependences of the dissipation factor tanδ( f ) and the Cole–Cole diagrams for germanium- and magnesium-doped vanadium-dioxide films in the range of 0.1–10^6 Hz are obtained. Measurements at temperatures between 173–373 K are performed. It is found that, at room temperature, an additional maximum in the tanδ( f ) dependence and an additional semicircle in the Cole–Cole diagram of the VO_2:Ge films as compared with those of undoped films appear at low frequencies. In the VO_2:Mg films, similar additional features in the dielectric spectra are observed at high frequencies. It is shown that the shape of the Cole – Cole diagrams for all the films is almost temperature independent in the mentioned temperature range, while the frequencies f _0 corresponding to the tanδ( f ) maxima increase with temperature. To interpret the dielectric spectroscopy data, a combined equivalent electrical circuit of the film sample is proposed. The mechanisms of the effect of Ge and Mg impurities on the characteristics of the complex Mott–Peierls semiconductor–metal phase transition are established.

Orthogonal alignment of DNA using hexafluoroisopropanol as solvent for film castings

RSC Advances ◽  
2014 ◽  
Vol 4 (75) ◽  
pp. 39798-39801 ◽  
Author(s):  
Donna Marie D. Mamangun ◽  
Jose L. Santana ◽  
Fahima Ouchen ◽  
James G. Grote ◽  
Gregory A. Sotzing
Keyword(s):  
Dielectric Constant ◽  
Dissipation Factor ◽  
Low Frequencies ◽  
Surfactant Complex ◽  
Fluorinated Alcohol

The use of the fluorinated alcohol, 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) as a processing solvent for orthogonal alignment of a DNA–surfactant complex is reported herein. 1-butanol (BuOH) was used as the control. At low frequencies, films of DNA–CTMA cast from HFIP exhibited a higher, more consistent dielectric constant and a lower dissipation factor compared to films cast from BuOH.

scholarly journals Investigation on Dielectric Properties of Press Board Coated with Epoxy Resin, Quartz, and Rice Husk Ash

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Banumathi S. ◽  
Karthik T. S. ◽  
Sasireka M. ◽  
Kiran Ramaswamy ◽  
Vishnu J. ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Epoxy Resin ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Volume Resistivity ◽  
Dielectric Strength ◽  
Dissipation Factor ◽  
Quartz Powder ◽  
The Press

Epoxy resin mixed with rice husk ash and quartz powder increases its dielectric strength. This paper presents the dielectric properties of the press board coated with this epoxy mixture. In this work, the press board, which is used in the transformer, is coated with three components: epoxy resin, rice husk ash, and quartz powder. The nanometer-sized quartz powder and rice husk ash are mixed in the particular ratio with the epoxy resin. The mixture of epoxy resin, quartz powder, and rice husk ash is coated on both sides of the press board. The dielectric constant, volume resistivity, and Tan Delta (dissipation factor) of the coated press board are compared with the noncoated press board. The results reveal that the coated board is having high dielectric constant and volume resistivity when compared to the noncoated board.

scholarly journals Synthesis and Characterization of ShortSaccaharum CilliareFibre Reinforced Polymer Composites

2009 ◽  
Vol 6 (1) ◽  
pp. 34-38 ◽  
Author(s):  
A. S. Singha ◽  
Vijay Kumar Thakur
Keyword(s):  
Mechanical Properties ◽  
Polymer Composites ◽  
Urea Formaldehyde ◽  
Thermal Studies ◽  
Synthesis And Characterization ◽  
Green Composites ◽  
Reinforced Polymer ◽  
The Matrix ◽  
Fibre Loading

This paper deals with the synthesis of shortSaccaharum Cilliarefibre (SC) reinforced Urea-Formaldehyde (UF) matrix based polymer composites. Present work reveals that mechanical properties such as: tensile strength, compressive strength, flexural strength and wear resistance of the UF matrix increase up to 30% fibre loading(in terms of weight) and then decreases for higher loading when fibers are incorporated into the matrix polymer. Morphological and Thermal studies of the matrix, fibre and short fibre reinforced (SF-Rnf) green composites have also been carried out. The results obtained emphasize the applications of these fibres, as potential reinforcing materials in bio based composites.

scholarly journals LTCC and Bulk Zn4B6O13–Zn2SiO4 Composites for Submillimeter Wave Applications

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1014
Author(s):  
Dorota Szwagierczak ◽  
Beata Synkiewicz-Musialska ◽  
Jan Kulawik ◽  
Norbert Pałka
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dissipation Factor ◽  
Submillimeter Wave ◽  
Sintering Behavior ◽  
High Frequencies ◽  
Low Dielectric ◽  
Low Dissipation ◽  
Temperature Dependences ◽  
Very High Frequencies

New zinc metaborate Zn4B6O13–willemite Zn2SiO4 composites were investigated as promising materials for LTCC (low temperature cofired ceramics) substrates of microelectronic circuits for submillimeter wave applications. Composites were prepared as bulk ceramics and LTCC multilayer structures with cofired conductive thick films. The phase composition, crystal structure, microstructure, sintering behavior, and dielectric properties were studied as a function of willemite content (0, 10, 13, 15, 20, 40, 50, 60, 100 wt %). The dielectric properties characterization performed by THz time domain spectroscopy proved the applicability of the composites at very high frequencies. For the 87% Zn4B6O13–13% Zn2SiO4 composite, the best characteristics were obtained, which are suitable for LTCC submillimeter wave applications. These were a low sintering temperature of 930 °C, compatibility with Ag-based conductors, a low dielectric constant (5.8 at 0.15–1.1 THz), a low dissipation factor (0.006 at 1 THz), and weak frequency and temperature dependences of dielectric constant.

Tuning the mechanical and dielectric properties of zinc incorporated hydroxyapatite

2020 ◽  
Vol 16 ◽  
Author(s):  
Alliya Qamar ◽  
Rehana Zia ◽  
Madeeha Riaz
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Bone Growth ◽  
Healing Process ◽  
Secondary Phase ◽  
Chemical Precipitation ◽  
Hexagonal Structure ◽  
Precipitation Method ◽  
Low Frequencies ◽  
A Minor

Background: Hydroxyapatite is similar to bone mineral in chemical composition, has good biocompatibility with host tissue and bone. Objective: This work aims to tailor the mechanical and dielectric properties of hydroxyapatite with zinc sudstitution, to improve wearability of implant and accelerate the healing process. Method: Pure and zinc incorporated hydroxyapatite Ca10(PO4)6(OH)2 samples have been successfully prepared by means of the chemical precipitation method. Results: The results showed that hydroxyapatite(Hap) having hexagonal structure was the major phase identified in all the samples. It was found that secondary phase of β-tricalcium phosphate (β-TCP) formed due to addition of Zinc resulting in biphasic structure BCP (Hap + β-TCP). A minor phase of ZnO also formed for higher concentration of Zn (Zn ≥ 2mol%) doping. It was found that the Zn incorporation to Hap enhanced both mechanical and dielectric properties without altering the bioactive properties. The microhardness increased upto 0.87 GPa for Zn concentration equal to 1.5mol%, which is comparable to the human bone ~0.3 - 0.9 GPa. The dielectric properties evaluated in the study showed that 1.5 mol% Zn doped hydroxyapatite had highest dielectric constant. Higher values of dielectric constant at low frequencies signifies its importance in healing processes and bone growth due to polarization of the material under the influence of electric field. Conclusion: Sample Z1.5 having 1.5 mol% Zn doping showed the most optimized properties suitable for bone regeneration applications.

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