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- W2941605511 abstract "Abstract This article deals with polymer dispersed liquid crystals (PDLCs) using polysiloxanes and low‐molecular‐weight liquid crystals (LCs). These composite materials exhibit generally a film texture consisting of nearly spherical microdomains filled with LC molecules and dispersed in a solid polymer matrix. These compounds are interesting because they raise a number of still unresolved fundamental questions, they lead to applications in the market of display devices and switchable windows and potential applications are foreseen in telecommunications. Applications of these systems are based essentially on their electrooptical responses when they are activated with an electric field. In the common situation of normal mode conditions, PDLC films are initially opaque but they become transparent to incident light when an electric field is applied. Understanding the electrooptical responses requires a detailed investigation of thermophysical properties and morphology to quantify the miscibility parameters and identify textures under various conditions of temperature and composition. This is the first step toward establishing correlations with the electrooptical properties and in particular understanding the variation of light transmission through the film before (off‐state) and after application of the field (on‐state). This work gives a detailed description of thermophysical and morphology properties in polymer/LC systems made of linear monodisperse polysiloxanes and nematic LCs. Two different polysiloxanes were used: poly(dimethylsiloxane) or PDMS and poly(methylphenylsiloxane) or PMPS with different molecular weights. Likewise, two model LCs were employed: the eutectic mixture of cyanoparaphenylenes E7 and the single component 4‐cyano‐4′‐ n ‐pentyl‐biphenyl or 5CB. A variety of experimental tools are employed to reach a good view on the film morphology, evaluate the thermophysical parameters, construct the phase diagrams, and understand the structural properties. The experimental data are rationalized in terms of a theoretical formalism adopted to the specific conditions of our systems." @default.
- W2941605511 created "2019-05-03" @default.
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- W2941605511 date "2016-12-21" @default.
- W2941605511 modified "2023-09-30" @default.
- W2941605511 title "Thermophysical and Structural Properties of Polymer/Liquid Crystal Systems Using Polysiloxanes" @default.
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- W2941605511 doi "https://doi.org/10.1002/9780470027318.a9541" @default.
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