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Side‐chain functionalized liquid crystalline polymers and blends, 5. Order parameter for hydrogen‐bonded blends of the functionalized liquid crystalline polymer with a low molecular weight dopant
Author(s) -
Barmatov Evgueni,
Grande Siegbert,
Filippov Alexander,
Barmatova Marina,
Kremer Friedrich,
Shibaev Valery
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<2603::aid-macp2603>3.0.co;2-6
Subject(s) - copolymer , dopant , liquid crystal , mesogen , polymer chemistry , materials science , polymer , side chain , polymer blend , doping , composite material , liquid crystalline , optoelectronics
A hydrogen‐bonded blend based on comb‐shaped functionalized LC copolymers containing alkyloxy‐4‐hydroxybenzoic acid fragments (proton donor) and a low molecular weight dopant 4‐(4‐pyridyloyl)methoxybenzoate‐d 4 (proton acceptor) was obtained. The temperature dependence of the order parameter S , the birefringence Δ n and the bend elastic constant K 3 of the LC copolymer and blend were studied by the 2 H NMR spectroscopy and the Freedericksz method of threshold transitions in a magnetic field. The formation of the blend leads to a decrease of the order parameter S of the functionalized LC copolymer. The essential difference in the order parameter S of the mesogenic groups of the LC copolymers and the dopant molecules was established.