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- W2027266502 abstract "We have studied the temperature dependence of the pyroelectric coefficient and spacing, the temperature and frequency dependences of the dielectric constant of polar LB films built up from molecules of p-(p-octadecyloxyphenylazo) benzenesulfonamide (18-OABS) with a large dipole moment. A significant pyroelectric effect in the films proved them to be polar. An irreversible transition at 90 °C from the polar to the nonpolar phase has been observed in these films. At this transition the structural period of the films changes (39 → 69 Å). The films were found not to have a solid-to-liquid transition but a liquid-crystal state. In the liquid-crystal state the films have several smectic mesophases. Phase transitions take place at T1 = 112–116 °C, T2 = 122–126 °C (69 → 63 Å), T3 = 134–138 °C (63 → 41 Å) and T4 = 150–155 °C (41 Å → melting). A strong frequency dependence of the dielectric constant was observed at T > 120 °C." @default.
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- W2027266502 date "1992-04-01" @default.
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- W2027266502 title "Polar multilayer Langmuir-Blodgett films of p-(p-octadecyloxyphenylazo) benzenesulfonamide" @default.
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- W2027266502 doi "https://doi.org/10.1016/0040-6090(92)90360-n" @default.
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