Phase diagrams of poly(dimethylsiloxane) and 5CB blends

The phase diagrams of poly(dimethylsiloxane) (PDMS) and 4‐cyano‐4′‐n‐pentyl‐biphenyl (5CB) mixtures are studied for two systems of different molecular weights of the polymer. The experimental diagrams are established by polarized optical microscopy (POM), and analyzed using a combination of the Flor...

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Bibliographic Details
Published in:Journal of polymer science. Part B, Polymer physics Polymer physics, 2001-03, Vol.39 (5), p.581-588
Main Authors: Gogibus, Nicolas, Maschke, Ulrich, Benmouna, Farida, Ewen, Bernd, Coqueret, Xavier, Benmouna, Mustapha
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Flory-Huggins
Inorganic and organomineral polymers
liquid crystal
Maier-Saupe
nematic-isotropic transition
phase diagram
Physicochemistry of polymers
polarized optical microscopy
polydimethylsiloxane
Properties and characterization
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Summary:The phase diagrams of poly(dimethylsiloxane) (PDMS) and 4‐cyano‐4′‐n‐pentyl‐biphenyl (5CB) mixtures are studied for two systems of different molecular weights of the polymer. The experimental diagrams are established by polarized optical microscopy (POM), and analyzed using a combination of the Flory–Huggins theory of isotropic mixing and the Maier–Saupe theory of nematic order. The results are compared with those of polystyrene (PS) and 4‐cyano‐4′‐n‐octyl‐biphenyl (8CB) with analogous molecular weight of the polymer. This investigation could be useful for the choice of systems in electro‐optical devices. © 2001 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 39: 581–588, 2001
ISSN:0887-6266
1099-0488
DOI:10.1002/1099-0488(20010301)39:5<581::AID-POLB1031>3.0.CO;2-Z