″PERSISTENT ELECTRICAL POLARIZATIONS IN POLYACRYLONITRILE″ .

Samuel I Stupp, S. H. Carr

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)

Abstract

Certain polymeric solids have the capacity to retain electrical polarization at ambient or lower temperatures for long periods of time (in some cases several years). Electrical polarization can result from the orientation of molecular moities, such as segments in the main chain or side groups, having a permanent dipole moment. Another possible contribution to polarization could arise from the drift of charged impurities during poling and lead to the formation of an asymmetric distribution of space charge. In experiments thermally stimulated discharge (TSD) technique has been employed; it provides quantitative information on the mean activation energies involved in molecular phenomena contributing to polarization. This information is provided through the recording of discharge current which flows between the shorted electrodes as a consequence of depolarization of the electret upon thermal stimulation. Polyacrylonitrile (PAN) film has been selected to investigate the electret effect. TSD of as-cast PAN films reveals current maxima at similar 100 degree C, 140 degree C and 190 degree C, which could possibly be associated with mechanically active and dielectric loss transitions previously observed. Films polarized under a low intensity field (5 multiplied by 10**4 Vcm** minus **1) at elevated temperature are capable of retaining electrical polarization, as indicated by the enhancement of TSD maxima at similar 95 degree C and 190 degree C. An increase in field intensity during poling results in the complete absence of TSD currents at similar 95 degree C. It is suggested that the absence of these currents results from the formation of a highly developed level of intermolecular bonding due to dipole orientation.

Original languageEnglish
Title of host publicationAm Chem Soc Div Org Coatings Plast Chem Prepr
Pages312-318
Number of pages7
Volume35
Edition2
Publication statusPublished - 1975
EventUnknown conference - Chicago, IL, USA
Duration: Aug 25 1975Aug 29 1975

Other

OtherUnknown conference
CityChicago, IL, USA
Period8/25/758/29/75

Fingerprint

Polyacrylonitriles
Polarization
Electrets
Dipole moment
Depolarization
Dielectric losses
Electric space charge
Activation energy
Impurities
Temperature
Electrodes
Experiments

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Stupp, S. I., & Carr, S. H. (1975). ″PERSISTENT ELECTRICAL POLARIZATIONS IN POLYACRYLONITRILE″ . In Am Chem Soc Div Org Coatings Plast Chem Prepr (2 ed., Vol. 35, pp. 312-318)

″PERSISTENT ELECTRICAL POLARIZATIONS IN POLYACRYLONITRILE″ . / Stupp, Samuel I; Carr, S. H.

Am Chem Soc Div Org Coatings Plast Chem Prepr. Vol. 35 2. ed. 1975. p. 312-318.

Research output: Chapter in Book/Report/Conference proceedingChapter

Stupp, SI & Carr, SH 1975, ″PERSISTENT ELECTRICAL POLARIZATIONS IN POLYACRYLONITRILE″ . in Am Chem Soc Div Org Coatings Plast Chem Prepr. 2 edn, vol. 35, pp. 312-318, Unknown conference, Chicago, IL, USA, 8/25/75.
Stupp SI, Carr SH. ″PERSISTENT ELECTRICAL POLARIZATIONS IN POLYACRYLONITRILE″ . In Am Chem Soc Div Org Coatings Plast Chem Prepr. 2 ed. Vol. 35. 1975. p. 312-318
Stupp, Samuel I ; Carr, S. H. / ″PERSISTENT ELECTRICAL POLARIZATIONS IN POLYACRYLONITRILE″ . Am Chem Soc Div Org Coatings Plast Chem Prepr. Vol. 35 2. ed. 1975. pp. 312-318
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