Dielectric Properties in Ferroelectric Optically Active Polyamides^*

Abstract

A relationship between dielectric constant ε or dielectric loss tan δ and structure was studied for optically active polyamides. The samples of these polyamides exhibited a chiral smectic phase due to their asymmetric structures and strong hydrogen bonds. The dielectric parameters were significantly influenced by temperature, but were hardly affected by frequency in the high-frequency region. The hindered rotations of the mesogens, which affect the polarization, depended on the structures and the phase transitions.

Keywords:

• Dielectric constant
• Dielectric loss
• Dielectric properties
• Optically active polymers
• Polyamides

Acknowledgments

Notes

Supported by Shanghai Education Foundation for Young Teachers of Shanghai Education Committee Funding under contract 96AJ08.