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- W2088392722 abstract "The molecular dynamics of a side-chain polymer liquid crystal with a poly(methyl acrylate) backbone and a (p-alkoxy-phenyl)-benzoate mesogenic group have been studied in the unaligned state as a function of temperature and pressure using dielectric spectroscopy. Polarizing optical microscopy, differential scanning calorimetry, and pressure-volume-temperature $(mathrm{PVT})$ measurements revealed three transition temperatures separating four phases (glass, smectic, nematic, and isotropic). Different dynamic processes have been identified reflecting librational modes (ensuremath{gamma} process), local relaxation of the mesogenic group (ensuremath{beta} process), the segmental mode (ensuremath{alpha} process) associated with the dynamic glass transition, and a slower process (ensuremath{delta} process) reflecting the side-chain dynamics within the liquid crystal order. Pressure exerts a stronger influence on the ensuremath{alpha} as compared to the ensuremath{delta} process. Starting from the nematic phase, pressure was found to induce the nematic-to-smectic transformation. The associated dynamic changes were in excellent agreement with the $mathrm{PVT}$ results implying that the dynamics are directly coupled to the thermodynamic state. Pressure was found to enhance the stability of the smectic order within the P-T phase diagram." @default.
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- W2088392722 date "2003-03-24" @default.
- W2088392722 modified "2023-10-16" @default.
- W2088392722 title "Temperature and pressure dependence of the dynamics in a poly(methyl acrylate) side-chain liquid-crystalline polymer" @default.
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- W2088392722 doi "https://doi.org/10.1103/physreve.67.031705" @default.
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