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Side‐chain functionalized liquid crystalline polymers and blends, 2. Phase behavior of comb‐shaped liquid crystalline ionomers containing ions of alkaline metals
Author(s) -
Barmatov Evgueni,
Pebalk Dmitry,
Barmatova Marina,
Shibaev Valery
Publication year - 2000
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(20000401)21:7<369::aid-marc369>3.0.co;2-o
Subject(s) - materials science , polymer , metal ions in aqueous solution , ionomer , phase (matter) , liquid crystal , copolymer , polymer chemistry , ion , metal , chemical engineering , organic chemistry , chemistry , composite material , optoelectronics , engineering , metallurgy
An effective way to synthesize liquid crystalline ionomers by an exchange reaction between the acid groups of functionalized LC polymers and a metal acetate was examined. A number of LC ionomers containing ions of the alkaline metals Na and Rb (1.2–18.3 mol‐%) were obtained. The introduction of small amounts (1.2–5 mol‐%) of metal ions into a functionalized LC polymer matrix leads to significant changes in the phase state of copolymers – the nematic phase is replaced by a SmA phase; an increase of the content of alkaline metal ions causes linear growth of clearing temperatures. The influence of the nature of the metal ions on the phase behavior of LC ionomers was determined. To describe the peculiarities of the LC ionomers' phase behavior a model based on the assumption that an ion multiplet is formed was proposed. Here, the rigidity of the functionalized LC copolymer chains used as a matrix for the preparation of LC ionomers was taken into consideration.