CHEMICAL ORIGIN OF THERMALLY STIMULATED DISCHARGE CURRENTS IN POLYACRYLONITRILE

Samuel I Stupp, S. H. Carr

Research output: Chapter in Book/Report/Conference proceedingChapter

36 Citations (Scopus)

Abstract

In the reported experiments, thermally 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, IR attenuated total reflection spectroscopy has been used to investigate the origin of thermally stimulated discharge currents near 200 degree 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 degree C is thus believed to be associated with the onset of chemical degradation.

Original languageEnglish
Title of host publicationJ Polym Sci Polym Phys Ed
Pages485-499
Number of pages15
Volume15
Edition3
Publication statusPublished - Mar 1977

Fingerprint

Polyacrylonitriles
Degradation
Spectroscopic analysis
Cyanides
Film thickness
Spectroscopy
Polarization
Ions
Polymers
Experiments

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Stupp, S. I., & Carr, S. H. (1977). CHEMICAL ORIGIN OF THERMALLY STIMULATED DISCHARGE CURRENTS IN POLYACRYLONITRILE. In J Polym Sci Polym Phys Ed (3 ed., Vol. 15, pp. 485-499)

CHEMICAL ORIGIN OF THERMALLY STIMULATED DISCHARGE CURRENTS IN POLYACRYLONITRILE. / Stupp, Samuel I; Carr, S. H.

J Polym Sci Polym Phys Ed. Vol. 15 3. ed. 1977. p. 485-499.

Research output: Chapter in Book/Report/Conference proceedingChapter

Stupp, SI & Carr, SH 1977, CHEMICAL ORIGIN OF THERMALLY STIMULATED DISCHARGE CURRENTS IN POLYACRYLONITRILE. in J Polym Sci Polym Phys Ed. 3 edn, vol. 15, pp. 485-499.
Stupp SI, Carr SH. CHEMICAL ORIGIN OF THERMALLY STIMULATED DISCHARGE CURRENTS IN POLYACRYLONITRILE. In J Polym Sci Polym Phys Ed. 3 ed. Vol. 15. 1977. p. 485-499
Stupp, Samuel I ; Carr, S. H. / CHEMICAL ORIGIN OF THERMALLY STIMULATED DISCHARGE CURRENTS IN POLYACRYLONITRILE. J Polym Sci Polym Phys Ed. Vol. 15 3. ed. 1977. pp. 485-499
@inbook{2f2bcfd03f1840e2a5d37993116d1236,
title = "CHEMICAL ORIGIN OF THERMALLY STIMULATED DISCHARGE CURRENTS IN POLYACRYLONITRILE",
abstract = "In the reported experiments, thermally 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, IR attenuated total reflection spectroscopy has been used to investigate the origin of thermally stimulated discharge currents near 200 degree 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 degree C is thus believed to be associated with the onset of chemical degradation.",
author = "Stupp, {Samuel I} and Carr, {S. H.}",
year = "1977",
month = "3",
language = "English",
volume = "15",
pages = "485--499",
booktitle = "J Polym Sci Polym Phys Ed",
edition = "3",

}

TY - CHAP

T1 - CHEMICAL ORIGIN OF THERMALLY STIMULATED DISCHARGE CURRENTS IN POLYACRYLONITRILE

AU - Stupp, Samuel I

AU - Carr, S. H.

PY - 1977/3

Y1 - 1977/3

N2 - In the reported experiments, thermally 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, IR attenuated total reflection spectroscopy has been used to investigate the origin of thermally stimulated discharge currents near 200 degree 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 degree C is thus believed to be associated with the onset of chemical degradation.

AB - In the reported experiments, thermally 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, IR attenuated total reflection spectroscopy has been used to investigate the origin of thermally stimulated discharge currents near 200 degree 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 degree C is thus believed to be associated with the onset of chemical degradation.

UR - http://www.scopus.com/inward/record.url?scp=0017471836&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0017471836&partnerID=8YFLogxK

M3 - Chapter

VL - 15

SP - 485

EP - 499

BT - J Polym Sci Polym Phys Ed

ER -