Preparation and Electro-Optic Characteristics of Polymer Network Liquid Crystals Based On Polymethylvinilpirydine and Polyethylene Glycol

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Characteristics of Polymer Network Liquid Crystals Based On Polymethylvinilpirydine and Polyethylene Glycol </title> <meta name="description" content="Preparation and Electro-Optic Characteristics of Polymer Network Liquid Crystals Based On Polymethylvinilpirydine and Polyethylene Glycol "> <meta name="keywords" content="liquid crystals, polymers, small-angle scattering, optical properties"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg 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class="card-body"><strong>Paper Count:</strong> 87356</div> </div> </div> </div> <div class="card publication-listing mt-3 mb-3"> <h5 class="card-header" style="font-size:.9rem">Preparation and Electro-Optic Characteristics of Polymer Network Liquid Crystals Based On Polymethylvinilpirydine and Polyethylene Glycol </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=T.%20D.%20Ibragimov">T. D. Ibragimov</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20R.%20Imamaliyev"> A. R. Imamaliyev</a>, <a href="https://publications.waset.org/abstracts/search?q=G.%20M.%20Bayramov"> G. M. Bayramov</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The polymer network liquid crystals based on the liquid crystals 袧37 and 5CB with polymethylvinilpirydine (PMVP) and polyethylene glycol (PEG) have been developed. Mesogene substance 4-n-heptyoxibenzoic acid (HOBA) is served for stabilization of obtaining composites. Kinetics of network formation is investigated by methods of polarization microscopy and integrated small-angle scattering. It is shown that gel-like states of the composite H-37 + PMVP + HOBA and 5CB+PEG+HOBA are formed at polymer concentration above 7 % and 9 %, correspondingly. At slow cooling, the system separates into a liquid crystal 鈥搑ich phase and a liquid crystal-poor phase. At this case, transition of these phases in the H-37 + PMVP + HOBA (87 % + 12 % + 1 %) composite to an anisotropic state occurs at 49 芯小 and 懈 41 芯小, accordingly, while the composite 5CB+PEG+HOBA (85% +13 % +2%) passes to anisotropic state at 36 芯小 corresponding to the isotropic-nematic transition of pure 5CB. The basic electro-optic parameters of the obtained composites are determined at room temperature. It is shown that the threshold voltage of the composite H-37 + PMVP + HOBA increase in comparison with pure H-37 and, accordingly, there is a shift of voltage dependence of rise times to the high voltage region. The contrast ratio worsens while decay time improves in comparison with the pure liquid crystal at all applied voltage. The switching times of the composite 5CB + PEG + HOBA (85% +13 % +2%) show anomalous behavior connected with incompleteness of the transition to an anisotropic state. Experimental results are explained by phase separation of the system, diminution of a working area of electro-optical effects and influence of areas with the high polymer concentration on areas with their low concentration. <iframe src="https://publications.waset.org/abstracts/23064.pdf" style="width:100%; height:400px;" frameborder="0"></iframe> <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=liquid%20crystals" title="liquid crystals">liquid crystals</a>, <a href="https://publications.waset.org/abstracts/search?q=polymers" title=" polymers"> polymers</a>, <a href="https://publications.waset.org/abstracts/search?q=small-angle%20scattering" title=" small-angle scattering"> small-angle scattering</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20properties" title=" optical properties"> optical properties</a> </p> <a 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Preparation and Electro-Optic Characteristics of Polymer Network Liquid Crystals Based On Polymethylvinilpirydine and Polyethylene Glycol