Title: Director orientation of nematic side-chain liquid crystalline polymers under shear flow: Comparison of a flow-aligning and a non-flow-aligning polysiloxane
Authors: Siebert, Hartmut ×
Ouijada-Garrido, Isabel
Vermant, Jan
Noirez, Laurence
Burghardt, Wesley R
Schmidt, Claudia #
Issue Date: Oct-2007
Publisher: Wiley-v c h verlag gmbh
Series Title: Macromolecular chemistry and physics vol:208 issue:19-20 pages:2161-2172
Abstract: The flow behavior and phase structure of two side-chain liquid-crystalline polysiloxanes with the same mesogens but different spacers of either four (PSi4) or six (PSi6) methylene groups are studied in the nematic phase by H-2 NMR, polarization microscopy, and scattering of light, neutrons, and X-rays. PSi4 is flow-algning, forming a monodomain with the director close to the flow direction, whereas PSi6 is non-flow-aligning showing a polydomain structure with a preferred director orientation corresponding to the log-rolling state. The flow behavior of PSi6 is related to the presence of strong smectic clusters. The director tilt in the smectic clusters of both polymers is reported.
ISSN: 1022-1352
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter, Rheology and Technology Section
× corresponding author
# (joint) last author

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