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Relevant bibliographies by topics / Polymer liquid crystals – Defects / Dissertations / Theses

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Dissertations / Theses on the topic 'Polymer liquid crystals – Defects'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

De, Luca Gino. "Computational modelling of nematic liquid crystal defects in devices and fiber processing." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103377.

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This thesis uses multiscale computational modelling to find the fundamental principles that govern defects forming during the operation of new electro-optical devices and the processing of spider silk fibers. The generalized approach developed in this thesis bridges engineering devices and biological processes based on liquid crystalline materials.<br>Three types of defects are encountered: inversion walls, lines and points. Inversion wall defects are found in the electro-optical device when a nematic thin film undergoes a temperature-induced surface anchoring transition. Point defects natural

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2

Kim, Min Su. "Liquid Crystalline Amorphous Blue Phase: Tangled Topological Defects, Polymer-stabilization, and Device Application." Kent State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=kent1448894363.

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3

Kasch, Nicholas. "Liquid crystal-polymer composites and the stabilisation of defect phases." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/liquid-crystalpolymer-composites-and-the-stabilisation-of-defect-phases(ee813754-56cd-493c-a631-d58b06d03c00).html.

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A simple method for increasing the stable temperature range of the liquid crystalline blue phase is demonstrated, by mixing a non-mesogenic polymer of low molecular weight into the blue phase material. In a mixture of cholesteryl benzoate and cholesteryl nonanoate the addition of polystyrene increased the stable blue phase range from 0.5K to 12K. This was measured strictly on heating from the chiral nematic phase through the blue phase in order to minimise non-equilibrium effects, and is one of the largest ranges so measured. The stability range can be closely tuned by changing the polymer con

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4

Hicks, Sarah Elizabeth. "Polymer-Dispersed and Polymer-Stabilized Liquid Crystals." Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1333417859.

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5

Silvestri, Regan L. "Spectroscopic characterization of the structure and motion of polymer liquid crystals and polymer dispersed liquid crystals." Case Western Reserve University School of Graduate Studies / OhioLINK, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=case1057587237.

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6

Lewis, Alexander. "Defects in liquid crystals : mathematical and experimental studies." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:56930aaf-43a5-46bb-9987-109b22950a97.

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Nematic liquid crystals are mesogenic materials that are popular working materials for optical displays. There has been an increased interest in bistable liquid crystal devices which support two optically distinct stable equilibria. These devices typically exploit a complex geometry or anchoring conditions, which often induces defects in the equilibria. There remains a great deal to be understood about the structure of the defects and how they stabilize multiple equilibria in modern devices. This thesis focuses on four problems: the first three explore the effect of confinement and defects on

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7

Pourmatin, Hossein. "Computational Multiscale Methods for Defects: 1. Line Defects in Liquid Crystals; 2. Electron Scattering in Defected Crystals." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/458.

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In the first part of this thesis, we demonstrate theory and computations for finite-energy line defect solutions in an improvement of Ericksen-Leslie liquid crystal theory. Planar director fields are considered in two and three space dimensions, and we demonstrate straight as well as loop disclination solutions. The possibility of static balance of forces in the presence of a disclination and in the absence of ow and body forces is discussed. The work exploits an implicit conceptual connection between the Weingarten-Volterra characterization of possible jumps in certain potential fields and th

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8

Bladon, Peter. "Phase transitions in nematic polymer liquid crystals." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307042.

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9

Gunther, Janelle. "Defects in liquid crystal polymers : their origins and behavior in magnetic and flow fields." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43466.

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10

Shafran, Matthew S. "Responsive liquid crystal polymer rods." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5598.

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Thesis (M.S.)--West Virginia University, 2008.<br>Title from document title page. Document formatted into pages; contains viii, 71 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 63-67).

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11

Denisov, Alexey. "Reconfigurable photonic crystals : external field structuring of liquid crystals - polymer composites." Télécom Bretagne, 2009. http://www.theses.fr/2009TELB0104.

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Cette thèse concerne l'étude des composites cristaux liquides (CL) / polymère. Notre but est de concevoir et de fabriquer des cristaux photoniques dont la structure soit reconfigurable par l'action d'un champ appliqué, électrique ou lumineux. Notre première réalisation se base sur l'utilisation de cristaux liquides cholestériques (CLC) stabilisés par un polymère. Les CLC présentent naturellement une structure hélicoïdale périodique, et sont donc des cristaux photoniques à une dimension pour certaines longueurs d'ondes. Pour former un cristal photonique bidimensionnel, nous avons induit une mod

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12

Wu, Haixia. "Anchoring Behavior of Chiral Liquid Crystal at Polymer Surface: In Polymer Dispersed Chiral Liquid Crystal Films." Thesis, Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-04082004-154054/unrestricted/wu%5Fhaixia%5F200405%5Fmast.pdf.

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Thesis (M.S.)--Textile and Fiber Engineering, Georgia Institute of Technology, 2004.<br>Griffin, Anselm, Committee Member; Srinivasarao, Mohan, Committee Chair; Park, Jung O., Committee Member. Includes bibliographical references (leaves 101-105).

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13

Haley, William Charles Jr. "The synthesis and asymetric reduction of a liquid crystalline polymer." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/11040.

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14

Chen, Lu Guang, and s3064076@student rmit edu au. "Thermo-Optical Properties of Polymer Dispersed Liquid Crystals." RMIT University. Applied Science, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080206.114823.

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Polymer dispersed liquid crystal (PDLC) films, consisting of micro-sized domains of a liquid crystal dispersing in a polymer matrix, serve as the basis of a variety of high-efficiency electro-optical effects. The thermo-optical properties of the PDLCs were investigated in this thesis. The thermal properties and the morphologies of four low molar mass mesogens were studied by DSC and polarized optical microscope (POM). There were significant super cooling/heating effects on the first order phase transitions but not on the mesophase transitions. The structural effects on the transition tempera

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15

Nemati, Hossein. "COLOR TUNING IN POLYMER STABILIZED CHOLESTERIC LIQUID CRYSTALS." Kent State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=kent1428717594.

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16

Jones, Christopher D. "Domains, defects, and de Vries: Electrooptics of smectic liquid crystals." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3284490.

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17

Flores, Suarez Rosaura. "Three-dimensional polarization probing in polymer ferroelectrics, polymer-dispersed liquid crystals, and polymer ferroelectrets." Phd thesis, Universität Potsdam, 2011. http://opus.kobv.de/ubp/volltexte/2012/6017/.

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A key non-destructive technique for analysis, optimization and developing of new functional materials such as sensors, transducers, electro-optical and memory devices is presented. The Thermal-Pulse Tomography (TPT) provides high-resolution three-dimensional images of electric field and polarization distribution in a material. This thermal technique use a pulsed heating by means of focused laser light which is absorbed by opaque electrodes. The diffusion of the heat causes changes in the sample geometry, generating a short-circuit current or change in surface potential, which contains informat

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18

Pena, Ricardo. "Polymeric liquid crystals as potential processing aids." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/9138.

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19

Nemitz, Ian R. "Liquid Crystals: Surfaces, Nanostructures, and Chirality." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1480686661255562.

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20

Shinton, S. E. "Optical and dielectric properties of polymer dispersed liquid crystals." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639025.

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Polymer Dispersed Liquid Crystals (PDLCs) are attracting considerable attention for new optical displays. This thesis describes the synthesis of PDLC materials, fabrication of cells and study of their optical and dielectric behaviour. This work includes two areas of research. Predominantly it is an investigation of the properties of PDLCs prepared using Polymerisation Phase Separation (PIPS) by UV irradiation of mutually soluble liquid crystal (LC) and pre-polymer materials, developed for use in PDLC systems. A limited study of liquid crystal gels completes the thesis. We demonstrate that the

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21

Brittin, Mark. "Analytical and morphological studies of polymer-stabilised liquid crystals." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297785.

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22

Blonski, Slawomir. "Computer Simulations of Mechanical Behavior of Polymer Liquid Crystals." Thesis, University of North Texas, 1991. https://digital.library.unt.edu/ark:/67531/metadc332725/.

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In this dissertation molecular dynamics simulations of behavior of polymer liquid crystals (PLC's) under tensile deformation have been performed. PLC's composed of random or block copolymers of rigid and flexible segments have been studies. Systems of fully flexible chains have been simulated for comparison. Stress-strain relations and fracture mechanics have been investigated.

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23

Kurz, GuÌˆnter. "Hydrodynamics of defects in nematic liquid crystal films." Thesis, King's College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313591.

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24

McHattie, Gillian S. "Ion transport in liquid crystalline polymer electrolytes." Thesis, University of Aberdeen, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324432.

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A systematic study of structure-property relations has been carried out on a range of polymers, both with and without mesogenic moieties. These materials have been characterised using various thermal techniques, including DSC and DMTA. These polymers have been complexed with LiClO<sub>4</sub> and the effects of the salt on thermal characteristics have been investigated. In addition, AC impedance spectroscopy has been employed to determine the temperature dependence of the conductivity of these complexes. Results suggest that polymers with mesogenic side groups have the potential to exhibit a c

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25

Namba, Takashi. "A synthesis of a new liquid crystal polyester." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/8641.

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26

Guo, Jian Xin. "Chiroptical properties of Lyotropic (Acetyl)(Ethyl)cellulose liquid crystals." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39513.

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(Acetyl)(ethyl)cellulose (AEC) polymers with an ethyl degree of substitution (DS) of 2.5 and acetyl DS ranging from 0 to 0.5 form chiral nematic liquid crystals in many organic solvents. The chiroptical properties of these lyotropic AEC mesophases are extremely sensitive to the acetyl DS of AEC and the nature of the solvents although the acetyl group and solvents are achiral and all the polymers share the same chiral cellulose backbone. As the acetyl DS increases from 0 to 0.5, the pitch of AEC mesophases in a given solvent varies from a few nanometer to infinity and a reversal of handedness o

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27

You, Seungyong. "The dynamics of DNA electrophoresis in lyotropic polymer liquid crystals." Tallahassee, Florida : Florida State University, 2009. http://etd.lib.fsu.edu/theses/available/etd-11132009-092618/.

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Thesis (Ph. D.)--Florida State University, 2009.<br>Advisor: David H. Van Winkle, Florida State University, College of Arts and Sciences, Dept. of Physics. Title and description from dissertation home page (viewed on May 10, 2010). Document formatted into pages; contains xvi, 137 pages. Includes bibliographical references.

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28

Masutani, Akira. "Guest-host effect of dyes in polymer dispersed liquid crystals." Thesis, Durham University, 2002. http://etheses.dur.ac.uk/4182/.

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The guest-host [GH) effect of a tetracyanoquinodimethane (TCNQ) dye in nematic liquid crystals (LC) and polymer dispersed liquid crystals (PDLC) has been studied and compared with commercial azo and anthraquinone dyes. The adduct (MORPIP) is a conjugated molecule with a high dipole moment of 15 Debyes. E7 LC doped with MORPIP was found to give a dichroic ratio of 2.34 and an order parameter of 0.31; these values are lower than for the other dichroic dyes, typically 0.6 - 0.78. However, MORPIP showed a useful property When doped in LC and PDLC samples. The rise time of E7 was decreased by 21% w

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29

Zhang, Hailiang. "Wavelength Tunable Devices Based on Holographic Polymer Dispersed Liquid Crystals." Kent State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=kent1203610126.

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30

Zhang, Guoqiang. "Stressed Liquid Crystals: Properties and Applications." [Kent, Ohio] : Kent State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1184972979.

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Thesis (Ph.D.)--Kent State University, 2007.<br>Title from PDF t.p. (viewed Mar. 4, 2009). Advisor: John West. Keywords: liquid crystal, polymer, shear, structure, application Includes bibliographical references (p. 252-267).

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31

Zeng, Erman. "Synthesis and characterization of HBA/HNA star-copolyester." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/10055.

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32

Zeng, Erman. "Design, synthesis and characterization of columnar discotic and bowlic liquid crystals." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/12268.

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33

Weng, Libo. "Polymer Stabilized Liquid Crystals: Topology-Mediated Electro-Optical Behavior And Applications." Kent State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=kent1460763169.

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34

López, Betty Lucy. "Thermophysical and Mechanical Properties of Polymer Liquid Crystals and Their Blends." Thesis, University of North Texas, 1994. https://digital.library.unt.edu/ark:/67531/metadc278308/.

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Tensile properties, namely the elastic modulus, tensile strength, percent of elongation at yield and at the break were determined for the pure components and blends. The results are connected to the respective phase diagrams and demonstrate that blending makes property manipulation possible. Blends for which the mechanical properties are better than those of pure EPs can be obtained.

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35

Davé, Vipul. "Cellulose-based fibers from liquid crystalline solutions /." This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-08232007-112345/.

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36

Wilson, Thomas Stephen. "The rheology and structure of thermotropic liquid crystalline polymers in extensional flow." Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-05222007-091333/.

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37

Biggins, John Simeon. "Soft and hard elasticity of liquid crystal elastomers." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608918.

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38

Jacob, Sunny. "Synthesis and characterization of low-melting thermotropic liquid crystalline poly(ester-imide)s /." Online version of thesis, 1994. http://hdl.handle.net/1850/11881.

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39

Murray, Bryce S. Murray. "Anchoring-Induced Topological Defects in Nematic Liquid Crystals: Core Relaxation Mechanisms and Electro-Optics." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1531143058239933.

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40

Gopalanarayanan, Bhaskar. "Analysis of Thermoplastic Polyimide + Polymer Liquid Crystal Blends." Thesis, University of North Texas, 1998. https://digital.library.unt.edu/ark:/67531/metadc279285/.

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Thermoplastic polyimides (TPIs) exhibit high glass transition temperatures (Tgs), which make them useful in high performance applications. Amorphous and semicrystalline TPIs show sub-Tg relaxations, which can aid in improving strength characteristics through energy absorption. The a relaxation of both types of TPIs indicates a cooperative nature. The semicrystalline TPI shows thermo-irreversible cold crystallization phenomenon. The polymer liquid crystal (PLC) used in the blends is thermotropic and with longitudinal molecular structure. The small heat capacity change (ACP) associated with the

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41

Kim, Sang Hwa. "Fast Switching Polymer Stabilized Liquid Crystal Devices: Morphological and Electro-Optical Properties." [Kent, Ohio] : Kent State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1101220722.

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42

Carrasco-Orozco, Miguel A. "Polymer networks from nematic, smectic and lyotropic liquid crystals for organic photovoltaics." Thesis, University of Hull, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440643.

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43

Folkes, Robert L. "Controlling the morphological and electro-optical properties of polymer dispersed liquid crystals." Thesis, Durham University, 2008. http://etheses.dur.ac.uk/3669/.

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Polymer dispersed liquid crystals have shown potential as the basis for a new display screen technology which can be used to produce flexible displays. The work presented here investigates the properties during the synthesis process of PDLCs, which affect the electro-optical properties of the films produced. An investigation is performed through the use of small angle light scattering, and small angle neutron scattering, into the thermodynamic phase properties of the initial liquid crystal monomer solution from which the PDLCs are formed. Through the use of small angle light scattering and ESE

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44

Hall, Jeffrey E. "Exploring photorefractive polymer-dispersed liquid crystals using near-field scanning optical microscopy /." Search for this dissertation online, 2004. http://wwwlib.umi.com/cr/ksu/main.

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45

Thapar, H. "Preferred orientation development in polymers." Thesis, Brunel University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384513.

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46

Lam, Wing Yip. "Synthesis and light emitting, liquid crystalline, and chiroptical properties of functional disubstituted polyacetylenes /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?CHEM%202003%20LAM.

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Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003.<br>Includes bibliographical references (leaves 308-330). Also available in electronic version. Access restricted to campus users.

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47

Wu, H. H. "Physico-chemical studies of polymers containing cycloalkyl and aza-crown-ether units." Thesis, University of Stirling, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377543.

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48

Jiang, Yingfei. "FLEXOELECTRIC LIQUID CRYSTALS AND THEIR APPLICATIONS." Kent State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=kent159518173259836.

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49

Bazzanini, Federico. "Polymer-liquid crystal interface: a molecular dynamics study." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5757/.

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Liquid crystals (LCs) are an interesting class of soft condensed matter systems characterized by an unusual combination of fluidity and long-range order, mainly known for their applications in displays (LCDs). However, the interest in LC continues to grow pushed by their application in new technologies in medicine, optical imaging, micro and nano technologies etc. In LCDs uniaxial alignment of LCs is mainly achieved by a rubbing process. During this treatment, the surfaces of polymer coated display substrates are rubbed in one direction by a rotating cylinder covered with a rubbing cloth. Basi

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50

Wang, Qian. "Effect of molecular order on photopolymerization behavior and polymer properties of liquid crystal monomers a dissertation /." San Antonio : UTHSC, 2008. http://proquest.umi.com.libproxy.uthscsa.edu/pqdweb?did=1594485671&sid=1&Fmt=2&clientId=70986&RQT=309&VName=PQD.

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