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Side‐chain functionalized liquid crystalline polymers and blends, 3. Effect of intra‐ and intermolecular hydrogen bonds on the order parameter and elasticity constants of side‐chain functionalized LC polymers
Author(s) -
Filippov A. P.,
Andreeva L. N.,
Barmatov E. B.,
Barmatova M. V.,
Kremer F.,
Shibaev V. P.
Publication year - 2000
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(20001101)201:17<2591::aid-macp2591>3.0.co;2-6
Subject(s) - hydrogen bond , mesogen , intermolecular force , intramolecular force , polymer , side chain , liquid crystal , polymer chemistry , monomer , chemistry , crystallography , materials science , molecule , organic chemistry , liquid crystalline , optoelectronics
New series of functionalized side‐chain LC polymers were synthesized. They contain phenyl benzoate mesogenic groups and functional carboxylic groups, derivatives of alkyloxybenzoic acid, with different numbers of methylene groups in the spacer ( n = 3, 6, and 9). The effect of hydrogen bonds on the phase state and the structure of LC polymers is shown. It was found that the increase in the length of the flexible fragment in the functional monomer unit ( n = 6 or 9) favors the formation of intermolecular hydrogen bonds. In the case of a short spacer ( n = 3), predominantly intramolecular hydrogen bonds are formed. The formation of intra‐ and intermolecular hydrogen bonds influences the values and the temperature dependencies of birefringence, the order parameter and orientational elastic constants for the nematic phase of the LC copolymers.