The electrical response of novel electrolytic systems composed from polymer polyethylene oxide (PEO) and the mesogenic liquid crystal (LC) mixture E8 was studied upon temperature variation. Free-standing films (thickness of 0.1 mm) of flexible composite electrolytes were produced by solution casting technique from PEO and E8LC at a ratio PEO:E8LC 70:30 wt.% [1]. Such electrolyte systems were measured by complex electrical impedance spectroscopy in the frequency range from 0.5 Hz to 1 MHz of the applied electric field. The thermal behavior of PEO/E8LC electrolyte films were analyzed and interrelated to their structural properties. The temperature-dependent change of ionic conductivity and the corresponding characteristics of PEO/E8LC electrolyte films were compared to those of films of pure E8LC measured under the same experimental conditions. As a result from the inclusion of the mesogenic E8LC, the ionic conductivity of the studied PEO/E8LC blends is considerably increased. Thus, such polymer-LC composite materials are attractive for sensorics, mechatronics and soft electronics applications.
ELECTRICAL IMPEDANCE SPECTROSCOPY STUDY OF NOVEL ELECTROLYTIC SYSTEMS COMPOSED FROM POLYMER POLYETHYLENE OXIDE (PEO) AND LIQUID CRYSTAL E8
N. Scaramuzza
2019
Abstract
The electrical response of novel electrolytic systems composed from polymer polyethylene oxide (PEO) and the mesogenic liquid crystal (LC) mixture E8 was studied upon temperature variation. Free-standing films (thickness of 0.1 mm) of flexible composite electrolytes were produced by solution casting technique from PEO and E8LC at a ratio PEO:E8LC 70:30 wt.% [1]. Such electrolyte systems were measured by complex electrical impedance spectroscopy in the frequency range from 0.5 Hz to 1 MHz of the applied electric field. The thermal behavior of PEO/E8LC electrolyte films were analyzed and interrelated to their structural properties. The temperature-dependent change of ionic conductivity and the corresponding characteristics of PEO/E8LC electrolyte films were compared to those of films of pure E8LC measured under the same experimental conditions. As a result from the inclusion of the mesogenic E8LC, the ionic conductivity of the studied PEO/E8LC blends is considerably increased. Thus, such polymer-LC composite materials are attractive for sensorics, mechatronics and soft electronics applications.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
