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Chiral side chain copolymers, 4. Kinetics of the phase transition from liquid melt to an amorphous phase with a hidden layer structure – the “isotropic smectic” state
Author(s) -
Kozlovsky Mikhail V.,
Meier Johann G.,
Stumpe Joachim
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<2377::aid-macp2377>3.0.co;2-n
Subject(s) - mesophase , side chain , bilayer , phase transition , azobenzene , materials science , monolayer , copolymer , phase (matter) , kinetics , amorphous solid , isotropy , liquid crystal , dichroic glass , polymer chemistry , crystallography , chemistry , thermodynamics , polymer , organic chemistry , optics , composite material , nanotechnology , membrane , biochemistry , physics , optoelectronics , quantum mechanics
The kinetically controlled mesophase formation has been observed for a series of photochromic side chain copolymethacrylates. Up to 25% of azobenzene dichroic moieties, the copolymers form an optically isotropic mesophase with layer ordering – the “isotropic smectic” phase, IsoSm*. The kinetics of the Iso‐IsoSm* phase transition, as studied by DSC and X‐ray techniques, in some cases cannot be explained in terms of a single Avrami equation. A two‐step mechanism is suggested including the transformation from the monolayer to the bilayer structure. The dependence of the transition temperature on annealing temperature has been estimated.