Voltage-dependent phase transition and pyroelectric effect in a new chiral smectic polymer
β Scribed by M.V. Kozlovsky; S.A. Pikin; W. Haase
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 534 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0014-3057
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β¦ Synopsis
Abtract-A new chiral smectic side chain polymer has been synthesized showing a ferroelectric Sm C* phase between the isotropic and smectic B phases. The clearing phase transition (on heating) depends on the d.c. voltage applied. This behaviour could be explained by some theoretical consideration. Pyroelectric measurements give the maximum value of spontaneous polarization for the polymer P, u 4.0 nC/cm2.
π SIMILAR VOLUMES
A sharp change in transmittance from a transparent state to a light scattering one within a tiny temperature range is induced accompanied with the heat-induced phase transition from a smectic-A (S A ) phase to a chiral nematic (N\*) one in a sidechain smectic-A liquid crystalline polymer ( S A LCP)
A series of organo-soluble hairy-rod polyimides was recently synthesized from 3,3Π,4,4Π-biphenyltetracarboxylic dianhydride (BPDA) and di[n-alkyl]-4,4Π-diamino-6,6Π-dibromo-2,2Π-biphenyldicarboxylate with side chains of varying lengths (the numbers of methylene units), BACBP(n). Dynamic mechanical (