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Textures of ethyl cellulose–dichloroacetic acid mesomorphic solution
Author(s) -
Huang Y.,
Zhou J. Y.
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070430912
Subject(s) - mesophase , texture (cosmology) , isotropy , liquid crystal , materials science , phase transition , anisotropy , phase (matter) , polarized light microscopy , polymer , crystallography , dichloroacetic acid , cellulose , organic chemistry , thermodynamics , composite material , optics , chemistry , physics , optoelectronics , artificial intelligence , computer science , image (mathematics)
Textures of the ethyl cellulose (EC)‐dichloroacetic acid (DCA) mesomorphic solution were studied systematically by polarizing microscopy and small‐angle light scattering. It was found that with increasing polymer concentration, the mesophase could show a disklike texture, an oil streak texture, a pseudoisotropic texture, and an iridescent planar texture. Within the mesophase the ordering degree is different in different zones. The phase transition between anisotropic and isotropic phases could also be accomplished by changing temperature. With increasing temperature the mesophase with the lower degree of order could first transform to the isotropic phase and the phase transition from an anisotropic phase with a higher degree of order to the isotropic one could take place only at the higher temperature. A disklike texture was also observed during the phase transition between the anisotropic and isotropic phases when the solution was heated and it was probably a basic texture in polymer cholesteric liquid crystals.