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- W2526086979 abstract "The modification of polyvinylidene fluoride (PVDF) polymer properties with irradiation is of interest as it possesses unique piezo-, pyro-, and ferroelectric properties. In this paper, we report the results of acoustic parameters of irradiated PVDF mixed with dimethylacetamide (DMAC) solution with low energy <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mrow><mml:mi>γ</mml:mi></mml:mrow></mml:math>-source (Cs-137). The polymer solution covered with mica film assures only <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M2><mml:mrow><mml:mi>γ</mml:mi></mml:mrow></mml:math>-ray passage and the duration was increased from 18 to 50 hours to achieve the higher dose rate. The dose rate was estimated using the strength of the radioactive source and the duration of the exposure. The ultrasonic velocity (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M3><mml:mrow><mml:mi>v</mml:mi></mml:mrow></mml:math>), density (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M4><mml:mrow><mml:mi>ρ</mml:mi></mml:mrow></mml:math>), and viscosity (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M5><mml:mrow><mml:mi>η</mml:mi></mml:mrow></mml:math>) of 0.2 wt% and 0.5 wt% PVDF dissolved in pure DMAC solution, irradiated with different dose rate were measured using ultrasonic interferometer (Mittal make), Pyknometer, and Oswald’s viscometer, respectively. It is observed that the values of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M6><mml:mrow><mml:mi>v</mml:mi></mml:mrow></mml:math>, <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M7><mml:mrow><mml:mi>ρ</mml:mi></mml:mrow></mml:math>, and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M8><mml:mrow><mml:mi>η</mml:mi></mml:mrow></mml:math> change with dose rate. The acoustic parameters such as adiabatic compressibility (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M9><mml:mrow><mml:mi>β</mml:mi></mml:mrow></mml:math>), intermolecular free path length (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M10><mml:mi>L</mml:mi><mml:mrow><mml:mi>f</mml:mi></mml:mrow></mml:math>), acoustic impedance (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M11><mml:mrow><mml:mi>Z</mml:mi></mml:mrow></mml:math>), relative association (RA), ultrasonic attenuation (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M12><mml:mi>α</mml:mi><mml:mo>/</mml:mo><mml:msup><mml:mrow><mml:mi>f</mml:mi></mml:mrow><mml:mrow><mml:mn fontstyle=italic>2</mml:mn></mml:mrow></mml:msup></mml:math>), and relaxation time (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M13><mml:mrow><mml:mi>τ</mml:mi></mml:mrow></mml:math>) are calculated using the experimental data. These results are interpreted in terms of the solute-solvent interaction in a polymer solution and scissoring chain damage." @default.
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- W2526086979 date "2016-09-29" @default.
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- W2526086979 title "Low Energy Gamma Radiation Induced Effects on Ultrasonic Velocity and Acoustic Parameters in Polyvinylidene Fluoride Solution" @default.
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