Effect of molecular structure on chiro-optical and photo-optical properties of smart liquid crystalline polyacrylates

0395129 - FZÚ 2014 RIV US eng J - Journal Article
Bobrovsky, A. - Shibaev, V. - Bubnov, Alexej - Hamplová, Věra - Kašpar, Jan - Glogarová, Milada
Effect of molecular structure on chiro-optical and photo-optical properties of smart liquid crystalline polyacrylates.
Macromolecules. Roč. 46, č. 11 (2013), 4276-4284. ISSN 0024-9297. E-ISSN 1520-5835
R&D Projects: GA ČR GA13-14133S; GA ČR(CZ) GAP204/11/0723
Grant - others:AVČR(CZ) M100101204
Institutional support: RVO:68378271
Keywords : induced circular-dichroism * air-nematic interface * azobenzene
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 5.927, year: 2013

Comparative study of chiro- and photo-optical properties of three novel chiral photochromic liquid crystalline azobenzene-containing comb-shaped polyacrylates was performed. The synthesized polymers contain the same polyacrylate backbones and uniform in spacer size but have different structure of azobenzene-containing mesogenic groups with different chiral tail. Existence of lateral chlorine substituent in the mesogen fragment leads to an extreme decrease of isotropization temperature and causes a disappearance of cholesteric mesophase. Circular dichroism (CD) spectra demonstrate a formation of helical order elements even in the amorphousized spin-coated polymer films. Possibility of manipulation of CD values and degree of a helical order by light and annealing was studied. UV-irradiation of all polymers induces E-Z isomerization of azobenzene groups disrupting LC-order.
Permanent Link: http://hdl.handle.net/11104/0223251