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Phase Behavior of Nematic Liquid Crystal/Star‐Polymer Systems
Author(s) -
Yoon Dong Kyu,
Lee Yong Seok,
Bae Young Chan
Publication year - 2002
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20020101)203:1<41::aid-macp41>3.0.co;2-j
Subject(s) - liquid crystal , polystyrene , isotropy , polymer , star (game theory) , phase transition , materials science , phase (matter) , star polymer , lattice (music) , alkoxy group , thermodynamics , chemical physics , condensed matter physics , polymer chemistry , chemistry , physics , organic chemistry , optics , composite material , copolymer , alkyl , astrophysics , acoustics
We investigated mixed nematic liquid crystal/star‐polymer systems and derived a new model based on Freed's lattice cluster theory to describe their phase behavior. To account for the highly oriented interactions between segments, the proposed model requires an additional parameter (δε/ k ) related to the energy of the oriented interaction. The nematic–isotropic transition temperature of p ‐ethoxy‐benzylidene‐ p ‐ n ‐butylaniline (EBBA)/star‐polystyrene systems were determined by thermo‐optical analysis technique. The proposed model gives very good agreement with experimental data.