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Abstract
Polymer-dispersed liquid crystal (PDLC) films whose matrices consist of two-component epoxy resins have been studied. Their driving voltage and response time depend on the epoxy oligomer/hardener ratio in the epoxy resin. When an excess of the hardener (polythiol) is mixed in the epoxy resin, PDLC films which have the following superior properties have been successfully fabricated. 1) The driving voltages are lower than that of the PDLC film which contain an equal amount of the epoxy oligomer and the hardener. 2) The driving voltage and response time do not change with time. On the other hand, when an equal amount of the oligomer and the hardener are mixed in the epoxy resin, the driving voltage and response time of the PDLC film vary with the time. The driving voltage change of the PDLC films is related to the change of their admittance by the use of a two-phase model, in which spherical droplets are dispersed in the matrix.
