Title
Synthesis and properties of phenyl benzoate-based and biphenyl-based liquid crystalline thiol-ene monomers
Author
Wilderbeek, H.T.A.
van der Meer, M.G.M.
Jansen, M.A.G.
Nelissen, L.
Fischer, H.R.
van Es, J.J.G.S.
Bastiaansen, C.W.M.
Lub, J.
Broer, D.J.
Technisch Physische Dienst TNO - TH
Publication year
2003
Abstract
Novel phenyl benzoate-based and biphenyl-based liquid crystalline thiol-ene monomers were synthesized and their properties investigated. By varying the bridging unit and spacer length, the type of mesophase can be tuned from the low ordered nematic and smectic A phase in the case of the phenyl benzoate-based monomers, to the highly ordered crystal E phase for the biphenyl-based monomers and their corresponding bromo precursors. We investigated the degree of order of the phenyl benzoate-based materials using the Haller method. Possible premature polymerization of these monomers was examined by size exclusion chromatography. The materials exhibit low transition temperatures and a high stability at typical handling times and temperatures. Consequently, these monomers are useful for in situ polymerization with anisotropic inert solvents, which could potentially lead to new architectures and enhanced electro-optical properties of devices. The use of the biphenyl-based monomers appears to be of limited use for polymerizations in anisotropic solution. However, as a result of their intrinsic high degree of molecular order, these monomers form a particularly interesting class of reactive materials that can be bulk polymerized to give main chain polymers with highly defined mechanical and optical or electro-optical properties.
Subject
Instruments
Benzoic acid derivative
Biphenyl derivative
Bromine derivative
Monomers
Phenyl benzoate derivative
Solvent
Unclassified drug
Anisotropy
Chemical structure
Crystal structure
Electronics
Liquid crystal
Molecular stability
Polymerization
Structure analysis
Synthesis
Temperature dependence
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TNO identifier
236923
Publisher
Taylor & Francis
ISSN
0267-8292
Source
Liquid Crystals, 30 (1), 93-108
Document type
article