POLYMER DISPERSED LIQUID CRYSTALS MADE OF DEUTERIATED POLYSTYRENE AND 8CB BLENDS: A SMALL ANGLE NEUTRON SCATTERING STUDY

Structural properties of Polymer Dispersed Liquid Crystals made of mixtures of deuteriated polystyrene (dPS) and 4-cyano-4′-n-octylbiphenyl (8CB) are studied by Small Angle Neutron Scattering (SANS). Two distinct blends are considered with a polymer dPS molar mass M u equal to 49500g/mol and liquid...

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Bibliographic Details
Published in:Molecular crystals and liquid crystals (Philadelphia, Pa. : 2003) Pa. : 2003), 2004-01, Vol.413 (1), p.35-42
Main Authors: Maschke, U., Gogibus, N., Ewen, B., Wagner, T., Noirez, L., Benmouna, M.
Format: Article
Language:English
Subjects:
liquid crystal
neutron scattering
phase behavior
polymer
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Summary:Structural properties of Polymer Dispersed Liquid Crystals made of mixtures of deuteriated polystyrene (dPS) and 4-cyano-4′-n-octylbiphenyl (8CB) are studied by Small Angle Neutron Scattering (SANS). Two distinct blends are considered with a polymer dPS molar mass M u equal to 49500g/mol and liquid crystal concentration 60 and 75 weight% (wt.-%). Data covering the range of temperature from 30°C to 75°C are discussed. In this temperature domain, 8CB exhibits a variety of orderings such as smectic-A (21.5°C-33.5°C), nematic (33.5°C-40.5°C) or simply an isotropic state above 40.5°C. The results are rationalized in terms of the Random Phase Approximation (RPA) invoking the temperature dependence of the Flory-Huggins interaction parameter and the correlation length of fluctuations at the interface of polymer and liquid crystal.
ISSN:1542-1406
1563-5287
DOI:10.1080/15421400490432542