Ferroelectric Polarization Reversal in Polyureas with Odd Number of CH2 Groups
- 1 August 1992
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 31 (8A) , L1086
- https://doi.org/10.1143/jjap.31.l1086
Abstract
Ferroelectric polarization reversal was found in polyureas with an odd number of CH2 groups: polyheptamethyleneurea, polynonamethyleneurea and copoly(heptametylene/nonamethylene urea) (polyurea 79). Remanent polarization as high as 440 mC/m2 and coercive field of 28 MV/m were observed in quenched polyurea 79 at 90°C. The irreversible dielectric anomaly in a temperature region of crystal transition was shown in the quenched samples. Polyureas with an odd number of CH2 groups are ferroelectrics.Keywords
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