STUDY OF AC/DC CONDUCTIVITY OF POLY VINYL CHLORIDE PVC AND EC, EC/PVC CONDUCTION MECHANISMS RESPONSIBLE FOR THE CONDUCTIVITY

2021 ◽  
pp. 53-57
Author(s):  
R.S. Bhuyar ◽  
S.D. Kharbade ◽  
N.R. Welekar
Keyword(s):  
Dielectric Constant ◽  
Vinyl Chloride ◽  
Temperature Increase ◽  
Ac Conductivity ◽  
Dc Conductivity ◽  
Current Work ◽  
Frequency Range ◽  
Conduction Mechanisms ◽  
Poly Vinyl Chloride ◽  
Graph Form

The current work investigates the AC and DC conductivity constant of PVC and EC samples (3:1) at many constant temperatures in the frequency range (323K to 363K). The ndings were presented in graph form. The dielectric constant increases with temperature increase at constant frequencies, Dielectric constant decreases with frequency increases, and AC conductivity increases with frequencies at different constant temperatures. The frequencies reach almost saturation values as the ultimate 1MHz value reaches. The AC conductivity increases with the increase in frequency has been observed.

scholarly journals Dopping Effect on Optical Constant of Poly (Vinyl Chloride)

2011 ◽  
Vol 8 (4) ◽  
pp. 976-981
Author(s):  
Baghdad Science Journal
Keyword(s):  
Dielectric Constant ◽  
Absorption Coefficient ◽  
Vinyl Chloride ◽  
Maxwell Equation ◽  
Extinction Coefficient ◽  
Refraction Index ◽  
Optical Parameters ◽  
Optical Studies ◽  
Poly Vinyl Chloride ◽  
Salt Complex

Thick films of poly(vinyl chloride)(PVC)& PVC doped with Zn(etx)2 salt complex have been prepared by cast method with fixed thickness almost (120±5) Microns. Optical studies were carried out in the wavelengths region(200-900)nm based on absorption & transmition measurement. Optical parameters such as absorption coefficient(?) ,refraction index(n) and extinction coefficient(K) were observed to be effected by adding the dopant.Electrical parameters such as real(?)& imaginary(?) part of dielectric constant were also calculated part of dielectric constant were also calculated from the optical parameters using Maxwell equation.

scholarly journals Study of Dielectric Properties of Fenugreek Seeds (Trigonella Foenum Graecum)

2014 ◽  
Vol 66 (1) ◽  
pp. 17-28 ◽  
Author(s):  
Mohd. Shafi Khan ◽  
Vishal Singh Chandel ◽  
Rajiv Manohar ◽  
Jagdeesh Prasad Shukla
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Moisture Content ◽  
Ac Conductivity ◽  
Frequency Range ◽  
Fenugreek Seeds ◽  
Temperature Controller ◽  
Trigonella Foenum Graecum ◽  
Fenugreek Seed

Abstract The present paper studied the dielectric constant, dielectric loss, and ac conductivity of fenugreek seed, a medicinal seed (Trigonella foenum graecum), within the frequency range of 10 kHz and 10 MHz and the temperature range of 30°C and 50°C. Impedance gain/phase analyser (HP 4194 A) was used to measure the dielectric constant and the dielectric loss and Julabo (temperature controller, F-25, Germany) was used for keeping the temperature of fenugreek seeds constant. It was found that the dielectric constant and the dielectric loss decrease with the increase in the frequency while the same increase with the increase in temperature and moisture content. The ac conductivity increased with the increase in frequency, moisture and temperature.

TRANSPORT PROPERTIES OF THERMALLY EVAPORATED In2Se3 THIN FILMS

2009 ◽  
Vol 16 (05) ◽  
pp. 723-729 ◽  
Author(s):  
D. NITHYAPRAKASH ◽  
B. PUNITHAVENI ◽  
J. CHANDRASEKARAN
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Ac Conductivity ◽  
Thermal Evaporation ◽  
Frequency Range ◽  
X Ray Diffraction ◽  
Cbh Model ◽  
X Ray ◽  
Correlated Barrier Hopping ◽  
Tan Δ

Thin films of In2Se3 were prepared by thermal evaporation. X-ray diffraction indicated that the as-grown films were amorphous in nature and became polycrystalline γ-In2Se3 films after annealing. The ac conductivity and dielectric properties of In2Se3 films have been investigated in the frequency range 100 Hz–100 kHz. The ac conductivity σ ac is found to be proportional to ωn where n < 1. The temperature dependence of both ac conductivity and the parameter n is reasonably well interpreted by the correlated barrier hopping (CBH) model. The values of dielectric constant ε and loss tangent tan δ were found to increase with frequency and temperature. The ac conductivity of the films was found to be hopping mechanism. In I–V characteristic for different field and temperature were studied and it has been found that the conduction process is Poole–Frenkel type.

Electrospun Conditions of Poly(vinyl chloride) Nanofibrous Membrane Plasticized with Polyurethane

2014 ◽  
Vol 68 (5) ◽  
Author(s):  
Kritsada Phatcharasit ◽  
Wirach Taweepreda ◽  
Kanoktip Boonkerd ◽  
Jin-Kuk Kim
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Scanning Electron Microscopy ◽  
Dielectric Constant ◽  
Glass Transition ◽  
Thermal Properties ◽  
Vinyl Chloride ◽  
Poly Vinyl Chloride ◽  
Lcr Meter ◽  
Scanning Electron

Electrospun poly(vinyl chloride) (PVC) nanofibrous were prepared by electrospinning. Various concentration of polyurethane (PU) were added to PVC solution for plasticization of the electrospun nanofibrous. The pristine and plasticized nanofibrous were characterized by field emission scanning electron microscopy (FE-SEM), differencial thermal analysis (DTA), and thermogravimetry analysis (TGA), respectively. Thermal properties form DTA and TGA results indicated that the addition of PU decreased glass transition temperature (Tg) of PVC and increased heat resistance of PVC nanofiber. The dielectric constant of plasticized nanofibrous measured using precision LCR meter indicated that the membrane were dense.  

Dielectric Properties of Polyester Reinforced with Carbon Black Particles

2011 ◽  
Vol 110-116 ◽  
pp. 170-176
Author(s):  
Omed Ghareb Abdullah ◽  
Dana Abdull Tahir ◽  
Gelas Mukaram Jamal ◽  
Salah Raza Saeed
Keyword(s):  
Activation Energy ◽  
Dielectric Constant ◽  
Carbon Black ◽  
Low Temperatures ◽  
Ac Conductivity ◽  
Low Frequency ◽  
Frequency Range ◽  
Exponential Factor ◽  
Increasing Temperature ◽  
Dielectric Permittivity And Loss

Dielectric constant and ac conductivity of Polyester doped with carbon black are investigated in the frequency range (0.5-103) KHz and within the temperature range (26-80) oC. Dielectric permittivity and loss tangent reduced with increasing frequency and increase with increasing temperature. The ac conductivity σac for all samples were found to be weak frequency dependent at low frequency, however vary with frequency as a power law ωs at higher frequency range. The variation of frequency exponential factor s between 0.63 and 0.77, indicates a dominant hopping process at low temperatures. From the temperature dependence of dc conductivity, the increase of activation energy was observed with carbon black concentrations.

IMPEDANCE MEASUREMENTS ON PZT ANDLa0.75Bi3.25Ti3O12CERAMICS

2009 ◽  
Vol 23 (19) ◽  
pp. 3881-3893 ◽  
Author(s):  
N. V. PRASAD ◽  
J. SUBRAHMANYAM ◽  
P. NARAYANA MURTY ◽  
S. KARMAKAR ◽  
S. M. GUPTA
Keyword(s):  
Temperature Coefficient ◽  
Ac Conductivity ◽  
Figure Of Merit ◽  
Room Temperature ◽  
Spectroscopic Analysis ◽  
Dc Conductivity ◽  
Ferroelectric Ceramics ◽  
Frequency Range ◽  
Impedance Measurements ◽  
Different Temperatures

Impedance measurements were made on technological important ferroelectric ceramics, namely PZT and La0.75Bi3.25Ti3O12(BLT), in the frequency range of 100 Hz to 1 MHz, from room temperature to 500°C. Combined impedance and modulus spectroscopic analysis along with the detailed conductivity (ac and dc) data was used to understand the heterogeneity of the ceramics and the results were corroborated with temperature coefficient of dc-conductivity (figure of merit) data for the further understanding. AC-conductivity plots against frequency at different temperatures for PZT and BLT suggest the response of obeying Jonscher's and modified Jonscher's law, respectively.

Dielectric dispersion and AC conductivity of acrylonitrile butadiene rubber-poly(vinyl chloride)/graphite composite

2011 ◽  
Vol 122 (2) ◽  
pp. 1226-1235 ◽  
Author(s):  
S. A. Mansour ◽  
M. E. Al-ghoury ◽  
E. Shalaan ◽  
M. H. I. El Eraki ◽  
E. M. Abdel-Bary
Keyword(s):  
Vinyl Chloride ◽  
Ac Conductivity ◽  
Dielectric Dispersion ◽  
Butadiene Rubber ◽  
Graphite Composite ◽  
Acrylonitrile Butadiene Rubber ◽  
Poly Vinyl Chloride

scholarly journals Влияние химического состава кристаллов TlIn-=SUB=-1-x-=/SUB=-Er-=SUB=-x-=/SUB=-S-=SUB=-2-=/SUB=- (0≤ x≤0.01) на их диэлектрические характеристики и параметры локализованных состояний

2019 ◽  
Vol 61 (11) ◽  
pp. 2030
Author(s):  
С.Н. Мустафаева ◽  
М.М. Асадов
Keyword(s):  
Dielectric Constant ◽  
Charge Transfer ◽  
Chemical Composition ◽  
High Frequency ◽  
Ac Conductivity ◽  
Relaxation Dispersion ◽  
Complex Dielectric Constant ◽  
High Frequency Range ◽  
Frequency Range ◽  
Frequency Dependences

The frequency dependences of the real (ε) and imaginary (ε ″) components of the complex dielectric constant, tangent of dielectric loss (tan) and ac conductivity (σac) of the obtained TlIn1-хErхS2 (0  x  0.01) crystals have been studied in the frequency range f = 5104–3.5107 Hz. It is established that in TlIn1-хErхS2 a relaxation dispersion of ε and ε″ takes place. The effect of erbium concentration (Er) in TlIn1-хErхS2 crystals on their dielectric coefficients was studied. In the high frequency range, the ac conductivity of TlIn1-хErхS2 crystals obeyed the σac ~ f 0.8 law, which is characteristic of a hopping charge transfer mechanism at states localized near the Fermi level. The parameters of states localized in the band gap and the influence of the chemical composition of the TlIn1-хErхS2 crystals on these parameters are estimated.

scholarly journals Effect of Nano ZnO on the Optical Properties of Poly(vinyl chloride) Films

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Wasan Al-Taa’y ◽  
Mohammed Abdul Nabi ◽  
Rahimi M. Yusop ◽  
Emad Yousif ◽  
Bashar Mudhaffar Abdullah ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Refractive Index ◽  
Optical Properties ◽  
Vinyl Chloride ◽  
Optical Conductivity ◽  
Extinction Coefficient ◽  
High Frequency ◽  
Urbach Energy ◽  
High Frequency Dielectric Constant ◽  
Poly Vinyl Chloride

Optical properties of pure and doped poly(vinyl chloride) (PVC) films, prepared by using casting technique, with different nanosize zinc oxide (ZnO) concentrations (1–20) wt% have been studied. Parameters such as extinction coefficient, refractive index, real and imaginary parts, Urbach energy, optical conductivity, infinitely high frequency dielectric constant, and average refractive index were studied by using the absorbance and transmittance measurement from computerized UV-visible spectrophotometer (Shimadzu UV-1601 PC) in the spectral range 200–800 nm. This study reveals that the optical properties of PVC are affected by the doping of ZnO where the absorption increases and transmission decreases as ZnO concentration increases. The extinction coefficient, refractive index, real and imaginary parts, infinitely high frequency dielectric constant, and average refractive index values were found to increase with increasing impurity percentage. The Urbach energy values are found to be decreasing with increasing ZnO concentration. The optical conductivity increased with photon energy after being doped and with the increase of ZnO concentration.

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