Accession Number : ADA019203

Title :   Thermally Stimulated Discharge Currents from Polyacrylonitrile.

Descriptive Note : Technical rept.,

Corporate Author : NORTHWESTERN UNIV EVANSTON ILL DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Comstock,R. J. ; Stupp,S. I. ; Carr,S. H.

Report Date : 08 DEC 1975

Pagination or Media Count : 28

Abstract : Electrical polarization in as-cast and poled films of stretched and unstretched polyacrylonitrile have been measured with the thermally stimulated discharge technique. Preferential orientation of nitrile side-groups in polarized specimens is observed with birefringence and inferred from x-ray diffraction experiments, but the contribution of total electrical polarization appears to be small. The major contribution is concluded as being due to trapped space charges, some part of which is probably associated with residual solvent molecules. Because this space charge is probably comprised of unequal quantities of positively and negatively charged species, polarized polyacrylonitrile is predicted to behave as a monopole electret. (Author)

Descriptors :   *Acrylonitrile polymers, *Electrets, *Polarization, Electric discharges, Electric current, Space charge, Heating

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE