Please use this identifier to cite or link to this item: https://physrep.ff.bg.ac.rs/handle/123456789/1389
Title: Dielectric spectroscopy of nanocomposites based on iPP and aPS treated in the water solutions of alkali metal salts
Authors: Petronijević, Ivan 
Cerovic, Dragana D.
Dudic, Dusko A.
Dojčilović, Jablan 
Dojcinovic, Biljana P.
Pergal, Marija V.
Keywords: alkali metal salts;dielectric spectroscopy;polymer nanocomposites
Issue Date: 1-Jun-2018
Journal: Polymers for Advanced Technologies
Abstract: 
In this paper, a new simple and environmentally friendly treatment technique for obtaining polymer nanocomposites with appropriate dielectric properties has been presented. Sheets of isotactic polypropylene and atactic polystyrene were immersed in 3 saturated water solutions of alkali metal salts (LiCl, NaCl, and KCl) at 2 fixed temperatures (23°C and 90°C), and 3 DC electrical potentials (+4 kV, −4 kV, and ground potential) were applied. A quantification of alkali metals in the polymer sheets was conducted by inductively coupled plasma optic emission spectrometry. The obtained concentration values were from 7.38·10−9 mol/cm3 to 1.25·10−7 mol/cm3. The qualitative analysis of potassium distribution in the polymer matrix was conducted by time-of-flight secondary ion mass spectrometry cross-sectional record. The relative dielectric constant (ε′) of samples was investigated in the frequency range from 20 Hz to 9 MHz at the constant temperature of 22°C. Stable values of ε′ in fully measured frequency range were observed for both pure and treated samples. Next, the results of the dielectric spectroscopy measurements were compared and established the kind of treatment that provided the highest value of ε′. The relationship between the concentrations of alkali metals and the values of relative dielectric constant was determined for the samples obtained by a treatment at 90°C and +4 kV.
URI: https://physrep.ff.bg.ac.rs/handle/123456789/1389
ISSN: 10427147
DOI: 10.1002/pat.4289
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