Chemical origin of thermally stimulated discharge currents in polyacrylonitrile
作者:
S. I. Stupp,
S. H. Carr,
期刊:
Journal of Polymer Science: Polymer Physics Edition
(WILEY Available online 1977)
卷期:
Volume 15,
issue 3
页码: 485-499
ISSN:0098-1273
年代: 1977
DOI:10.1002/pol.1977.180150308
出版商: John Wiley&Sons, Inc.
数据来源: WILEY
摘要:
AbstractThermally stimulated discharge has been used in the past to diagnose and estimate the magnitude of electrical polarization in polymers. Nevertheless, molecular characterization of operative phenomena by this technique alone is often a difficult task. In the present work, infrared attenuated total reflection spectroscopy has been used to investigate the origin of thermally stimulated discharge currents near 200°C in externally unpolarized films of polyacrylonitrile (PAN). Spectroscopic analysis of thermally degraded films reveals some unsaturation of the PAN backbone and possibly the generation of cyanide ions. Opposite surfaces in a solvent‐cast film give different spectra, indicating a gradient in chemical degradation products across the film thickness. Data suggest that nonuniform generation of charged species and unsaturated bonds gives rise to internal potentials in PAN. The origin of thermally stimulated currents in PAN near 200°C is thus believed to be associated with the onset of chemical degradat
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