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Polymers with Unusual Electrical Properties.
CASE WESTERN RESERVE UNIV CLEVELAND OHIO DEPT OF MACROMOLECULAR SCIENCE
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Polyoctamethylene dibenzimidazole is an amorphous polymer. When cast from formic acid, crystalline films of the 11 complex of benzimidazoleformic acid are obtained. The crystalline polymer shows large peaks in the dielectric constant and loss factor at 120C which are frequency independent, indicating a first order process. The value of the dielectric constant at the top of the peak is about comparable to values obtained for single crystals of ferroelectric substances. Such films also store large amounts of charge on being poled, and exhibit spontaneous current flow and voltage. The variation of the magnitudes of the current, charge, and voltage as a function of time and temperature are discussed, and a rationale is presented for the observed phenomena. There is a reasonable probability that the formic acid complex is ferroelectric.
APPROVED FOR PUBLIC RELEASE