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Polymer stabilized liquid crystals: ...

Weng, Libo,

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Polymer stabilized liquid crystals: Topology-mediated electro-optical behavior and applications /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Polymer stabilized liquid crystals: Topology-mediated electro-optical behavior and applications // Libo Weng.
Author:	Weng, Libo,
Description:	1 electronic resource (154 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 77-12, Section: B.
Contained By:	Dissertations Abstracts International77-12B.
Subject:	Polymer chemistry. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10109949
ISBN:	9781339732183

Polymer stabilized liquid crystals: Topology-mediated electro-optical behavior and applications /
Weng, Libo,

Polymer stabilized liquid crystals: Topology-mediated electro-optical behavior and applications /Libo Weng. - 1 electronic resource (154 pages)

Source: Dissertations Abstracts International, Volume: 77-12, Section: B.

There has been a wide range of liquid crystal polymer composites that vary in polymer concentration from as little as 3 wt.% (polymer stabilized liquid crystal) to as high as 60 wt.% (polymer dispersed liquid crystals). In this dissertation, an approach of surface polymerization based on a low reactive monomer concentration about 1 wt.% is studied in various liquid crystal operation modes. The first part of dissertation describes the development of a vertical alignment (VA) mode with surface polymer stabilization, and the effects of structure-performance relationship of reactive monomers (RMs) and polymerization conditions on the electro-optical behaviors of the liquid crystal device has been explored. The polymer topography plays an important role in modifying and enhancing the electro-optical performance of stabilized liquid crystal alignment. The enabling surface-pinned polymer stabilized vertical alignment (PSVA) approach has led to the development of high-performance and fast-switching displays with controllable pretilt angle, increase in surface anchoring energy, high optical contrast and fast response time. The second part of the dissertation explores a PSVA mode with in-plane switching (IPS) and its application for high-efficiency and fast-switching phase gratings. The diffraction patterns and the electro-optical behaviors including diffraction efficiency and response time are characterized. The diffraction grating mechanism and performance have been validated by computer simulation. Finally, the advantages of surface polymerization approach such as good optical contrast and fast response time have been applied to the fringe-field switching (FFS) system. The concentration of reactive monomer on the electro-optical behavior of the FFS cells is optimized. The outstanding electro-optical results and mechanism of increase in surface anchoring strength are corroborated by the director field simulation. The density and topology of nanoscale polymer protrusions are analyzed and confirmed by morphological study. The developed high-performance polymer-stabilized fringe-field-switching (PS-FFS) could open new types of device applications.

English

ISBN: 9781339732183Subjects--Topical Terms:

3173488
Polymer chemistry.
Subjects--Index Terms:

Liquid crystals

Polymer stabilized liquid crystals: Topology-mediated electro-optical behavior and applications /
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245 1 0 $a Polymer stabilized liquid crystals: Topology-mediated electro-optical behavior and applications / $c Libo Weng.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 1 electronic resource (154 pages)
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500 $a Source: Dissertations Abstracts International, Volume: 77-12, Section: B.
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502 $b Ph.D. $c Kent State University $d 2016.
520 $a There has been a wide range of liquid crystal polymer composites that vary in polymer concentration from as little as 3 wt.% (polymer stabilized liquid crystal) to as high as 60 wt.% (polymer dispersed liquid crystals). In this dissertation, an approach of surface polymerization based on a low reactive monomer concentration about 1 wt.% is studied in various liquid crystal operation modes. The first part of dissertation describes the development of a vertical alignment (VA) mode with surface polymer stabilization, and the effects of structure-performance relationship of reactive monomers (RMs) and polymerization conditions on the electro-optical behaviors of the liquid crystal device has been explored. The polymer topography plays an important role in modifying and enhancing the electro-optical performance of stabilized liquid crystal alignment. The enabling surface-pinned polymer stabilized vertical alignment (PSVA) approach has led to the development of high-performance and fast-switching displays with controllable pretilt angle, increase in surface anchoring energy, high optical contrast and fast response time. The second part of the dissertation explores a PSVA mode with in-plane switching (IPS) and its application for high-efficiency and fast-switching phase gratings. The diffraction patterns and the electro-optical behaviors including diffraction efficiency and response time are characterized. The diffraction grating mechanism and performance have been validated by computer simulation. Finally, the advantages of surface polymerization approach such as good optical contrast and fast response time have been applied to the fringe-field switching (FFS) system. The concentration of reactive monomer on the electro-optical behavior of the FFS cells is optimized. The outstanding electro-optical results and mechanism of increase in surface anchoring strength are corroborated by the director field simulation. The density and topology of nanoscale polymer protrusions are analyzed and confirmed by morphological study. The developed high-performance polymer-stabilized fringe-field-switching (PS-FFS) could open new types of device applications.
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650 4 $a Physics. $3 516296
653 $a Liquid crystals
653 $a Polymer composites
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710 2 $a Kent State University. $b College of Arts and Sciences / Department of Chemical Physics. $e degree granting institution. $3 3771764
720 1 $a Chien, Liang-Chy $e degree supervisor.
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