Polarization of an organic monomeric glass

A methylene dihydropyridine with a high ground-state dipole moment was investigated to explore the possibility of using it to form an organic monomeric glass "electret" film. Measurements were done in a specially designed test cell. An electric field was applied to a 100-μm-thick film of dihydropyridine while cooling from a melt. The cell potential was recorded as a function of time to study the homocharge and polarization relaxations. The homocharge relaxation time was ≈900 s. The polarization relaxation time was ≈2 × 105 s in the vicinity of the glass transition temperature. The polarization is linear over a wide range of electric field strength. © 1997 American Institute of Physics.