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A deuteron NMR study on order and phase behaviour of liquid‐crystalline copolymers
Author(s) -
Martin Andreas,
Tefehne Christoph,
Gronski Wolfram
Publication year - 1996
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/marc.1996.030170504
Subject(s) - liquid crystal , copolymer , materials science , mesogen , polybutadiene , lamellar structure , polystyrene , isotropy , polymer chemistry , phase (matter) , polymer , deuterium nmr , nuclear magnetic resonance spectroscopy , organic chemistry , liquid crystalline , chemistry , composite material , optics , physics , optoelectronics
Liquid‐crystalline (LC) block copolymers of lamellar morphology were prepared via anionic polymerization of polystyrene‐ block ‐1,2‐polybutadiene and subsequent introduction of a deuterated mesogen by polymer analogous reaction. Deuteron NMR measurements show that the first‐order nematic/isotropic transition in the block copolymer is changed to a critical behaviour under the influence of shear. In the nematic phase the order parameter is reduced with respect to the homopolymer, and there is no evidence of an isotropic boundary layer of the LC‐block at the nematic/isotropic interface.