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Full-Text Articles in Engineering
Equilibrium Phase-Behavior Of Nematic Mixtures, Hao-Wen Chiu, Thein Kyu
Equilibrium Phase-Behavior Of Nematic Mixtures, Hao-Wen Chiu, Thein Kyu
College of Polymer Science and Polymer Engineering
A phenomenological model for predicting phase diagrams of a binary nematic mixture containing side chain liquid crystalline polymers and/or low molar mass liquid crystals has been proposed by combining Flory-Huggins free energy of isotropic mixing and Maier-Saupe free energy for nematic ordering of the nematogens. Two orientational order parameters, s(1) and S-2, Of the two components in the mixtures having two different clearing temperatures are taken into consideration in the calculation. The Flory-Huggins interaction parameter, chi, and the nematic interaction parameter of the Maier-Saupe theory, nu(1) and nu(22), are assumed to be functions of inverse absolute temperature. Further the cross-nematic …
Spinodals In A Polymer-Dispersed Liquid-Crystal, Chungsea Shen, Thein Kyu
Spinodals In A Polymer-Dispersed Liquid-Crystal, Chungsea Shen, Thein Kyu
College of Polymer Science and Polymer Engineering
Thermodynamic phase equilibria of a polymer dispersed liquid crystal (PDLC) consisting of
monomeric liquid crystals and a polymer have been investigated theoretically and experimentally.
The equilibrium limits of phase separation as well as phase transition of a PDLC system were
calculated by taking into consideration the Flory–Huggins (FH) theory for the free energy of mixing
of isotropic phases in conjunction with the Maier–Saupe ~MS! theory for phase transition of a
nematic liquid crystal. The correspondence between the Landau–de Gennes expansion and the
Maier–Saupe theory was found and the coefficients were evaluated. The calculation based on the
combined FH-MS theory predicted …