ISSN:
0959-8103
Keywords:
transient currents
;
polymer blend films
;
quasi-steady-state currents
;
isochronal currents
;
activation energies
;
dipolar process
;
space charge
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Transient currents (charging and discharging currents) in poly(vinyl alcohol) (PVA)-poly(vinyl pyrrolidone) (PVP) polymer blend films were measured over the temperature range 30-150°C at field strengths of 2.32-23.2 × 106 Vm-1. Polymer films were prepared by the isothermal immersion technique. Activation energies were evaluated from quasi-steady-state currents. A single relaxation peak was observed both from isochronal currents and low frequency dielectric relaxation. Activation energies evaluated from these two methods are found to be in fairly good agreement. The polarization is considered to be due to space charge origin along with some contribution from dipolar groups. The maximum loss was observed in Sample I (PVA: PVP = 25:75), suggesting maximum heterogeneity in this blend ratio.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pi.1994.210350403
Permalink
