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Structure And Phase Behavior Of A Series Of Thermotropic Main Chain Liquid Crystalline Polyethers
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Book Synopsis Structure and Phase Behavior of a Series of Thermotropic Main-chain Liquid Crystalline Polyethers by : Yeocheol Yoon
Download or read book Structure and Phase Behavior of a Series of Thermotropic Main-chain Liquid Crystalline Polyethers written by Yeocheol Yoon and published by . This book was released on 1995 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phase Behavior and Molecular Segregation Phenomena in Main Chain Thermotropic Liquid Crystalline Polymers by : Dong Young Kim
Download or read book Phase Behavior and Molecular Segregation Phenomena in Main Chain Thermotropic Liquid Crystalline Polymers written by Dong Young Kim and published by . This book was released on 1990 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Liquid Crystal Polymers: From Structures to Applications by : A.A. Collyer
Download or read book Liquid Crystal Polymers: From Structures to Applications written by A.A. Collyer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject of liquid crystals and their use in electronic displays and in non-linear optical systems has become of tremendous importance during the last decade; and the incorporation of liquid crystal units into polymeric materials has led to a group of new materials with diverse properties. Some of these properties have been utilized in new products and some have yet to be used. Much published work has appeared that deals with specific materials or particular applications, and it was felt that a book was needed to examine and explain the underlying principles governing the diverse properties of these liquid crystal polymers, LCPs. The current work describes the diverse nature of LCPs, their synthesis, characterization, properties and finally their applications. It describes the manner in which liquid crystallinity or mesomorphism occurs in small molecules, monomer liquid crystals and polymer liquid crystals. Chapter 1 gives a classification of the various ways in which the meso gens may be connected to the polymer chains. Currently, the bulk of LCP material is based on main chain or longitudinal LCPs for use in engineering applications. The side chain or comb polymers are intended for use in electronics and opto-electronic systems and as surfactants. Many other variants and possibilities exist but their properties have not yet been fully studied or used. In this respect it is hoped that the current work will indicate future possibilities as well as discussing current opinion. v Preface vi Chapters 2 and 3 describe methods of characterizing the mesophases.
Book Synopsis Phase Behavior and Local Structure of Liquid Crystalline Polymers by : Herb Fynewever
Download or read book Phase Behavior and Local Structure of Liquid Crystalline Polymers written by Herb Fynewever and published by . This book was released on 1998 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Liquid-Crystal Polymers by : N.A. Platé
Download or read book Liquid-Crystal Polymers written by N.A. Platé and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drawing a picture of the current situation of this new field, this volume both summarizes the past achievements and analyzes the present unsolved problems.
Book Synopsis Liquid Crystalline and Mesomorphic Polymers by : Valery P. Shibaev
Download or read book Liquid Crystalline and Mesomorphic Polymers written by Valery P. Shibaev and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Among the various new directions in modern polymer science, the design and investigation of liquid crystal (LC) polymers have been the ones growing most actively and fruitfully. In spite of that, the possible formation of an anisotropic LC phase was only demonstrated theoretically for the first time in the 1950s by Onsager [1] and Flory [2], and then experimentally verified in the studies with polypeptides solutions. In essence, the studies of these LC lyotropic systems did not deviate from the theme of purely academic interest. It was at the beginning of the 1970s that the experimental "explosion" occurred, when aromatic polyamides were synthesized and their ability to form LC solutions in certain very aggressive solvents was discovered. The search for practical applications of such LC systems was crowned with the successful creation of the new generation of ultrastrong high-modulus ther mostable fibers, such as the Kevlar, due to the high degree of order of the macromolecules in the anisotropic LC state. In fact, these investigations coincided with the swift emergence on the practical "scene" of thermotropic low-molar-mass liquid crystals, with the use of these materials in microelectronics and electro optics (figures and let ters indicators, displays in personal computers, and flat TV, etc.). Polymer scientists also began to develop methods of synthesizing thermotropic LC polymers by incorporating mesogenic fragments in the main (main-chain LC polymers) or side branchings of the macromolecules (side-chain or comb shaped polymers).
Book Synopsis Polymer Liquid Crystals by : A Ciferri
Download or read book Polymer Liquid Crystals written by A Ciferri and published by Elsevier. This book was released on 2012-12-02 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer Liquid Crystals covers the significant developments in the field of highlight oriented polymers. This 12-chapter book emerged from lectures presented during the seminar "Polymer Liquid Crystals: Science and Technology", held at Santa Margherita Ligure, Italy on May 19-23, 1981. The opening chapters highlight the molecular basis of liquid crystallinity. The subsequent chapters deal with the synthesis, structure, properties, and macroscopic phenomena of polymer liquid crystals. These topics are followed by descriptions of the orientation of liquid crystals, specifically the instabilities in low molecular weight nematic and cholesteric liquid crystals. The final chapters consider the applications of these crystals to display devices and the advances in high-strength fibers and molecular composites. This book will be of great value to polymer liquid crystal chemists and researchers.
Book Synopsis Liquid Crystalline Order in Polymers by : Alexandre Blumstein
Download or read book Liquid Crystalline Order in Polymers written by Alexandre Blumstein and published by Elsevier. This book was released on 2012-12-02 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid Crystalline Order in Polymers examines the topic of liquid crystalline order in systems containing rigid synthetic macromolecular chains. Each chapter of the book provides a review of one important area of the field. Chapter 1 discusses scattering in polymer systems with liquid crystalline order. It also introduces the field of liquid crystals. Chapter 2 treats the origin of liquid crystalline order in macromolecules by describing the in-depth study of conformation of such macromolecules in their unassociated state. The chapters that follow describe successively the liquid crystalline order in polymers with mesogenic side groups and rigid backbones, in polypeptides, and in block copolymers. Chapter 7 discusses the rheology of such systems. The last two chapters examine liquid crystalline order in biological materials and mesomorphic order in the realm of polymers with inorganic backbones. This book is intended to provide the polymer scientist, the materials scientist, and the biologist with a valuable source of information.
Book Synopsis Polymeric Liquid Crystals by : Alexandre Blumstein
Download or read book Polymeric Liquid Crystals written by Alexandre Blumstein and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book originated in the Proceedings of the Second Symposium on Polymeric Liquid Crystals held by the Division of Polymer Chemistry in the framework of the 1983 Fall Meeting of the American Chemical Society. At the First Symposium in 1977, the literature in this field could be encompassed in a single volume. To day, that is no longer possible. The field of Polymeric Liquid Crystals grew, and continues to grow, at a very rapid pace. At present, we know of every major mesophase in its polymeric form and of polymeric glasses, elastomers and fluids in their liquid crystalline form. Every year, new polymeric mesophases are being discovered. The aim of this book is to go beyond a compilation of papers presented at the 1983 ACS Fall Meeting. It is conceived as a learning tool for the benefit of the sci entist interested in Polymeric Liquid Crystals. The book is divided into three sections. The first section contains articles discussing synthetic, physico chemical, structural and rheological aspects of Polymeric Liquid Crystals in their generality. A chapter on methods currently used in this field is also included. There are also chapters on theoretical and classification aspects of PLCs. These self-contained tutorial chapters provide an introduction to this field as well as to the specific papers given in the book. They provide an exhaustive cover age of literature on the subject from its inception to the present.
Book Synopsis Liquid Crystallinity in Polymers by : A. Ciferri
Download or read book Liquid Crystallinity in Polymers written by A. Ciferri and published by Wiley-VCH. This book was released on 1991 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Side Chain Liquid Crystal Polymers by : C.B. McArdle
Download or read book Side Chain Liquid Crystal Polymers written by C.B. McArdle and published by Springer Science & Business Media. This book was released on 1990-04-30 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanical and Thermophysical Properties of Polymer Liquid Crystals by : Witold Brostow
Download or read book Mechanical and Thermophysical Properties of Polymer Liquid Crystals written by Witold Brostow and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: may never overcome the effects of hysteresis and stress (see Chapters 6 and 12). The first sentence of the reference work, Handbook of Liquid Crystals, reads: The terms liquid crystals, crystalline liquid, mesophase, and mesomorphous state are used synonymously to describe a state of aggregation that exhibits a molecular order in a size range similar to that of a crystal but acts more or less as a viscous liquid: [2] In other words, molecules within a liquid crystalline phase possess some orientational order and lack positional order; furthermore, the shape of a liquid crystalline sample is determined by the vessel in which it is contained rather than by the orientational order of its aggregated molecules. The authors recognized the limitations and imprecision of this definition but, like others preceding them, could not devise a simple and generally applicable one that is better. Regardless, the terms 'liquid crystal' and 'mesophase' should not be used interchangeably. As mentioned above, all liquid crystals are mesophases, but all mesophases are not liquid crystals. Recent studies, employing elaborate and sophisticated analytical techniques, have permitted finer distinctions between classical crystals and mesophases. At the same time, they have made definitions like that from the Handbook of Liquid Crystals somewhat obsolete for reasons other than terminology. One part of the problem arises from the use of a combination of bulk properties (like flow) and microscopic properties (like molecular ordering) within the same definition.
Book Synopsis Morphology and Crystal Structure of Random, Main Chain, Semi-flexible, Thermotropic Liquid Crystal Polymers by : Susan Louise Kent
Download or read book Morphology and Crystal Structure of Random, Main Chain, Semi-flexible, Thermotropic Liquid Crystal Polymers written by Susan Louise Kent and published by . This book was released on 1992 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: The crystal structure and morphology of random, main chain, thermotropic liquid crystal polymers (LCP's) of equimolar amounts of the following structural units (with n equal to 4, 5, 6 and 7 in "A") have been examined by electron microscopy and diffraction:(DIAGRAM, TABLE OR GRAPHIC OMITTED...PLEASE SEE DAI) When crystallized from the liquid crystal state in the form of thin films, the polymer forms a 50-70A lamellar texture. Electron diffraction reveals an orthorhombic unit cell (a = 8.34A and b = 5.10A). Similar results were obtained with the 4, 6 and 7 carbon spacer LCP's. The observations can only be interpreted in terms of chain folding, the flexibility of the "spacer" along the polymers backbone permitting folding to occur. High temperature electron diffraction shows little change in positional ordering above the crystal-liquid crystal transition temperature. Rapid quenching from the liquid crystal state produces a ribbon-like morphology with the molecules oriented perpendicular to the long direction of the ribbons. Shearing the 7 carbon spacer LCP in the liquid crystal state results in $sim$150A lamellar crystals normal to the shear direction. The lamellae readily shear over one another, suggesting the presence of adjacent reentry chain folding. Single crystals of the 7 carbon flexible spacer LCP have been grown from dilute solution. This is the first report of solution grown single crystals of a liquid crystalline polymer. The crystals thicken (from $sim$100A to 190A) upon annealing below their crystal-liquid crystal melting temperature. Annealing in the liquid crystalline state produces unusual and unique morphologies. Extruded pellets of the 7 carbon flexible spacer LCP resemble a composite material with 0.2 $-$ 1.8$mu$m "fibers" oriented parallel to the extrusion direction. Etching revealed a lamellar morphology with the lamellae (50-1,800A) oriented perpendicular to the fiber extrusion direction. Thinner lamellae (50-130A) were observed on the surface of compression-molded articles with thicker, presumably extended chain lamellae, observed in the interior. Selected area electron diffraction confirms that the molecular axes are perpendicular to the lamellae. The results suggest significant degrees of chain folding in the liquid crystal state since it is unexpected that previously extended, nematically packed chains would fold during the liquid crystal-crystal transition.
Book Synopsis Liquid Crystalline Polymers by : Lei Zhu
Download or read book Liquid Crystalline Polymers written by Lei Zhu and published by Springer. This book was released on 2020-08-14 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of various self-assemblies in liquid crystalline polymers and their electrical, optical, mechanical, and flame retardant properties. Liquid crystalline polymers are unique self-assembled, functional soft materials with electrical, magnetic, and thermal responses which find potential applications in numerous areas. As well as providing an overview of their synthesis, self-assembly and dynamics the various applications are also discussed. Such applications as liquid crystalline elastomers, light responsive actuators, optical reflectors, gas barrier films, and even flame retardant polymers will be presented. The book is a useful resource for undergraduates, postgraduates and experienced researchers.
Book Synopsis Rheology and Processing of Liquid Crystal Polymers by : Domenico Acierno
Download or read book Rheology and Processing of Liquid Crystal Polymers written by Domenico Acierno and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid crystal polymers (LCPs) have many strange properties that may be utilized to advantage in the processing of products made from them and their blends with isotropic polymers. This volume (volume 2 in the series Polymer Liquid Crystals) deals with their strange flow behaviour and the models put forward to explain the phenomena that occur in such polymers and their blends. It has been known for some time that small ad ditions of a thermotropic LCP to isotropic polymers not only gives an improvement in the strength and stiffness of the blend but improves the processability of the blend over that of the isotropic polymer. In the case of lyotropic LCPs, it is possible to create a molecular composite in which the reinforcement of an isotropic polymer is achieved at a molecular level by the addition of the LCP in a common solvent. If the phenomena can be fully understood both the reinforcement and an increase in the proces sability of isotropic polymers could be optimized. This book is intended to illustrate the current theories associated with the flow of LCPs and their blends in the hope that such an optimization will be achieved by future research. Chapter 1 introduces the subject of LCPs and describes the ter minology used; Chapter 2 then discusses the more complex phenomena associated with these materials. In Chapter 3, the way in which these phe nomena may be modelled using hamiltonians is fully covered.
Book Synopsis Thermotropic Liquid Crystals, Fundamentals by : Gerrit Vertogen
Download or read book Thermotropic Liquid Crystals, Fundamentals written by Gerrit Vertogen and published by Springer. This book was released on 1988 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Advances in Liquid Crystalline Polymers by : L. L. Chapoy
Download or read book Recent Advances in Liquid Crystalline Polymers written by L. L. Chapoy and published by Springer. This book was released on 1985-01-24 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Based on the proceedings of the European Science Foundation Sixth Polymer Workshop on Liquid Crystal Polymer Systems held at Lyngby, Denmark, 12-14 September 1983"--Opp. t.p.
