Abstract
The phase behavior of N, N′-bis(3,4,5-trihexadecyloxyphenyl)urea (1) was investigated by differential scanning calorimetry, polarized optical microscopy, and X-ray diffraction. It was found that 1 exhibited two columnar phases, rectangular columnar and hexagonal columnar phases. The switching current peak (Ps ≈ 600nC/cm2) was observed under applying a triangular voltage with maintaining the homeotropic (dark) texture, which suggested that the polarities of the columns were changed by the applied triangular voltage without changing the directions of the column axes. The mechanism for the ferroelectric switching behavior was explained by the conformational isomerization of the urea moiety.
Published Version
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