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• W2000658311 abstract "Thermodynamic characteristics of a dimer liquid crystal comprising a relatively long spacer −O(CH2CH2O)6− were investigated. The contour length of the flexible spacer (∼25 Å) exceeds that of the hard segments (∼18 Å). The compound exhibits a nematic mesophase (N) between the crystal (C) and the isotropic melt (I) over a sizably wide temperature range (∼80 °C). Thermodynamic quantities such as thermal expansion coefficient α, isothermal compressibility β, thermal pressure coefficient γ (=α/β), and the volume change ΔV at the CN and NI interphase were carefully determined by the PVT measurements. The transition entropies due to volume expansion were estimated by the well-known relation ΔSV = γΔV. The latent entropies (ΔStr)P for both CN and NI transitions were estimated according to the Clapeyron relation from the PVT and DTA data. The magnitude of the constant-volume entropy changes (ΔStr)V calculated was found to be about 50−60% of the corresponding values of (ΔStr)P. These results were consistent with the previous 2H NMR observations that the chain segments adopt a nematic conformation in the LC state. The thermodynamic role of the flexible segment in determining the phase transitions has been critically discussed." @default.
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• W2000658311 date "2007-02-08" @default.
• W2000658311 modified "2023-10-16" @default.
• W2000658311 title "Thermodynamic Characteristics of Chain Molecules in the Nematic State: <i>PVT</i> Studies of Main-Chain Liquid Crystal Comprising a Long Oxyethylene-Type Spacer" @default.
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• W2000658311 doi "https://doi.org/10.1021/ma062447j" @default.
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