A liquid crystalline co-polysiloxane with asymmetric bent-shaped side chains

0359391 - FZÚ 2012 RIV DE eng J - Journal Article
Bubnov, Alexej - Novotná, Vladimíra - Pociecha, D. - Kašpar, Miroslav - Hamplová, Věra - Galli, G. - Glogarová, Milada
A liquid crystalline co-polysiloxane with asymmetric bent-shaped side chains.
Macromolecular Chemistry and Physics. Roč. 212, č. 2 (2011), s. 191-197. ISSN 1022-1352. E-ISSN 1521-3935
R&D Projects: GA AV ČR IAA100100911; GA AV ČR(CZ) GA202/09/0047; GA MŠMT(CZ) OC10006; GA MŠMT MEB050818
Grant - others:Federal Agency for Science and Innovation, Russian Federation(RU) RFASI No 02.740.11.5166
Institutional research plan: CEZ:AV0Z10100520
Keywords : calorimetry * liquid-crystalline polymers (LCP) * phase behaviou * polysiloxanes
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.361, year: 2011
http://onlinelibrary.wiley.com/doi/10.1002/macp.201000356/pdf

A co-polysiloxane has been prepared with an asymmetric bent-shaped side group based on a liquid crystalline monomer exhibiting the B2 (SmCP) phase, namely [4-(4’-undecenyloxy)biphenyl] [4-(4’-octyloxybiphenyl)-oxycarbonyl-4-(2-methoxyphenyl)] isophthalate. In order to dilute the side chain mesogens along the polymer backbone the octyl side chains were also incorporated. The X-ray studies confirmed that 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 the 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.
Permanent Link: http://hdl.handle.net/11104/0197185