Dependence of Cure Parameters on Pdlc Films Prepared by Electron Beam and Ultraviolet Curing

One basic method for the preparation of Polymer Dispersed Liquid Crystal (PDLC) films is the formation of microdroplets of liquid crystals (LCs) in a polymer matrix by a phase separation process. This can be achieved by radiation-initiated polymerization of a mixture including polymer precursors and...

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Bibliographic Details
Published in:Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Molecular crystals and liquid crystals, 1999-08, Vol.329 (1), p.569-577
Main Authors: Gyselinck, F., Maschke, U., Traisnel, A., Coqueret, X.
Format: Article
Language:English
Subjects:
Applied sciences
Electron Beam
Exact sciences and technology
nematic liquid crystals
phase separation
Physicochemistry of polymers
Polymer Dispersed Liquid Crystal
Polymerization
Polymers and radiations
Ultraviolet curing
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Summary:One basic method for the preparation of Polymer Dispersed Liquid Crystal (PDLC) films is the formation of microdroplets of liquid crystals (LCs) in a polymer matrix by a phase separation process. This can be achieved by radiation-initiated polymerization of a mixture including polymer precursors and LCs. The PDLC films used in this study were prepared by two different methods: Electron Beam (EB) or Ultraviolet (UV) curing. The electro-optical properties of the obtained PDLC-films based on a selected representative composition were investigated as a function of the chosen radiation. The transmission versus voltage curves exhibit a good reproducibility and a strong dependence on the curing conditions for samples prepared in the same experimental conditions. The evaluation of the electro-optical behavior indicates remarkable differences between EB- and UV-cured samples. The results are discussed in terms of off-/on-state transmission values and threshold voltage.
ISSN:1058-725X
DOI:10.1080/10587259908025983