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A Liquid‐Crystalline Co‐Polysiloxane with Asymmetric Bent Side Chains
Author(s) -
Bubnov Alexej,
Novotná Vladimíra,
Pociecha Damian,
Kašpar Miroslav,
Hamplová Vĕra,
Galli Giancarlo,
Glogarová Milada
Publication year - 2011
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/macp.201000356
Subject(s) - side chain , homeotropic alignment , mesophase , polymer , monomer , liquid crystal , materials science , siloxane , polymer chemistry , phase (matter) , bent molecular geometry , crystallography , chemistry , organic chemistry , composite material , optoelectronics
A co‐polysiloxane has been prepared with an asymmetric bent side group based on a liquid‐crystalline monomer showing a B 2 (SmCP) phase. In order to dilute the side chain mesogens along the polymer backbone, octyl side chains were also incorporated. X‐ray studies confirmed that the resulting co‐polysiloxane exhibits a liquid‐crystalline layered phase, the siloxane polymer chains being microphase segregated from the incompatible side chain mesogens. The mesophase of polymer exhibits a homeotropic structure that can be successfully aligned by unidirectional shear. This phase does not exhibit polar switching under an applied electric field unlike the bent‐core monomer used as the side chains of this polymer. This can be caused by the homeotropic alignment of the polymer samples.