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A deuteron NMR study on order and phase behaviour of liquid-crystalline copolymers

✍ Scribed by Andreas Martin; Christoph Tefehne; Wolfram Gronski

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
479 KB
Volume
17
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

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.

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