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Highly ordered side‐chain liquid‐crystalline polymers from maleic anhydride and swallow‐tailed 1‐alkenes having two mesogens
Author(s) -
Nieuwhof René P.,
Marcelis Antonius T. M.,
Sudhölter Ernst J. R.,
Picken Stephen J.,
van Puijenbroek Rob R.
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<2394::aid-macp2394>3.0.co;2-0
Subject(s) - mesogen , mesophase , polymer , side chain , maleic anhydride , polymer chemistry , materials science , liquid crystal , copolymer , glass transition , crystallography , liquid crystalline , chemistry , composite material , optoelectronics
Side‐chain liquid‐crystalline polymers (SCLCPs) were synthesized from the alternating copolymerization of maleic anhydride with swallow‐tailed 1‐alkenes having two mesogens. In contrast to similar polymers from 1‐alkenes with one mesogen per repeating unit, these novel polymers exhibited lower isotropization temperatures and higher glass transition temperatures. The degree of order in the mesophase strongly increased: these SCLCPs exhibited a highly ordered smectic H phase. The polymers with a hexyl spacer between the malonate junction and the mesogen exhibited a uniaxially limited‐correlation‐length smectic E mesophase (S Eu ) which has, according to our knowledge, not been observed before. The highest transition temperatures and entropy changes were observed for polymers with completely interdigitated side chains.