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Electrical conductivity in new imidazolium salts of dicarboxylic acids

Pogorzelec-Glaser K., Garbarczyk J., Pawlaczyk C., Markiewicz E.

Materials Science Poland

2006

Vol. 24, No. 1

245--252

Electrical conductivities of powder samples of five new imidazolium salts of aliphatic dicarboxylic acids (imidazolium malonate (1), imidazolium glutarate (2), imidazolium adipate monohydrate (3), diimidazolium suberate (4), imidazolium sebacate (5) were measured by impedance spectroscopy as a function of temperature. It was found that conductivities increase with temperature. At high temperatures, the lowest conductivity was determined for imidazolium glutarate (10-5 S/m) and the highest - for imidazolium sebacate (10-1 S/m). The correlation between crystal structures of the investigated salts and their ionic conductivities is discussed.

Dielectric and acoustic properties of bacterial cellulose designed for application in loudspeakers

Markiewicz E., Pawlaczyk C., Hilczer B.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

2004

Vol. 40, nr 15

257-261

The dielectric relaxation in the biocellulose modified by chitosan, chitosan acetate and chitosan lactate was studied in the frequency range from 100 Hz to 1 MHz in the temperature range 100 to 450 K. Three dielectric relaxations were found and assigned to the corresponding orientational processes on the molecular level: at -200 K - the local main chain motion, at ~ 330 K - an orientational motion in a mixed phase of polysaccharide and water and above 400 K - the ion migration. The electroacoustic parameters of the loudspeakers with the membranes made of biocellulose modified by chitosan and its derivatives were measured in anechoic conditions. The correlation between the dielectric response of studied polymers and the electroacoustic parameters of loudspeakers was stated.