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Mesophase structure and alignment under different fields of liquid crystalline main‐chain/side‐group block copolymers
Author(s) -
Galli Giancarlo,
Chiellini Emo,
Francescangeli Oriano,
Ferri Dino,
Wolff Dietmar,
Springer Jürgen,
Laus Michele,
Angeloni Annino S.
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971210120
Subject(s) - mesophase , copolymer , materials science , liquid crystal , side chain , phase (matter) , liquid crystalline , polyester , block (permutation group theory) , pendant group , chain (unit) , polymer , crystallography , polymer chemistry , composite material , chemical physics , chemistry , organic chemistry , geometry , physics , optoelectronics , mathematics , astronomy
Liquid crystalline block copolymers are new materials in which multiple molecular interactions can provide the driving force for complex phase behaviors and states of order. Block copolymers containing both liquid crystalline main‐chain polyester and side‐group polymethacrylate blocks were investigated. They phase separated in the liquid crystalline state and their individual mesophases coexisted. The copolymers responded very differently when either a mechanical or a magnetic field was used for alignment. In the fibers the orientations of the side‐group and main‐chain smectic planes with respect to the fiber axis depended critically on the block lengths and on their distinct tendencies to align, whereas under a magnetic field the mesogens aligned collectively with their long molecular axis parallel to the field, independent of the copolymer structure.