Mechanical And Thermophysical Properties Of Polymer Liquid Crystals
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| Author | : Witold Brostow |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 534 |
| Release | : 2013-11-27 |
| Genre | : Technology & Engineering |
| ISBN | : 1461557992 |
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.
| Author | : Domenico Acierno |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 331 |
| Release | : 2013-11-27 |
| Genre | : Technology & Engineering |
| ISBN | : 940091511X |
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.
| Author | : |
| Publisher | : |
| Total Pages | : 148 |
| Release | : 2006 |
| Genre | : Biosurfactants |
| ISBN | : 9789741433865 |
The liquid crystal polymer/organoclay composites were prepared by melt intercalation of liquid crystal polymer and montmorillonite clay organically modified with intercalating agent. The surfactant, haxadecyltrimethyl ammonium bromide was used to modify the montmorillonite surface to obtain the organoclay by ionic exchange between the interlayer cation and the surfactant cation. The resulting liquid crystal polymer intercalated into the organoclay was characterized by X-ray diffraction (XRD) and Fourier Transform Infrared spectrometry (FTIR). Tensile testing indicated that the reinforcement in the composites was more effective than pure polymer. The thermal stability and flammability of the liquid crystal polymer/organoclay composite were measured by thermogravimetric analysis (TGA) and UL- 94, respectively. By adding organoclay, the thermal stability was improved but the surfactant decreased the thermal stability. The UL- 94, V- 0 rating was achieved for the liquid crystal polymer/organoclay composites with varying organoclay contents.
| Author | : Sabu Thomas |
| Publisher | : William Andrew |
| Total Pages | : 444 |
| Release | : 2015-09-22 |
| Genre | : Technology & Engineering |
| ISBN | : 032339454X |
Design and Applications of Nanostructured Polymer Blend and Nanocomposite Systems offers readers an intelligent, thorough introduction to the design and applications of this new generation of designer polymers with customized properties. The book assembles and covers, in a unified way, the state-of-the-art developments of this less explored type of material. With a focus on nanostructured polymer blends, the book discusses the science of nanostructure formation and the potential performance benefits of nanostructured polymer blends and composites for applications across many sectors: electronics, coatings, adhesives, energy (photovoltaics), aerospace, automotive, and medical devices (biocompatible polymers). The book also describes the design, morphology, and structure of nanostructured polymer composites and blends to achieve specific properties. Covers all important information for designing and selecting the right nanostructured polymer system Provides specialized knowledge on self-repairing, nanofibre and nanostructured multiphase materials, as well as evaluation and testing of nanostructured polymer systems Serves as a reference guide for development of new products in industries ranging from electronics, coatings, and energy, to transport and medical applications Describes the design, morphology, and structure of nanostructured polymer composites and blends to achieve specific properties
| Author | : Visakh P. M. |
| Publisher | : John Wiley & Sons |
| Total Pages | : 402 |
| Release | : 2018-11-30 |
| Genre | : Technology & Engineering |
| ISBN | : 1119363888 |
“High Performance Polymers and Their Nanocomposites” summarizes many of the recent research accomplishments in the area of high performance polymers, such as: high performance polymers-based nanocomposites, liquid crystal polymers, polyamide 4, 6, polyamideimide, polyacrylamide, polyacrylamide-based composites for different applications, polybenzimidazole, polycyclohexylene dimethyl terephthalate, polyetheretherketone, polyetherimide, polyetherketoneketone, polyethersulfone, polyphenylene sulphide, polyphenylsulfone, polyphthalamide, Polysulfone, self-reinforced polyphenylene, thermoplastic polyimide.
| Author | : Shri Singh |
| Publisher | : Springer Nature |
| Total Pages | : 578 |
| Release | : |
| Genre | : |
| ISBN | : 303150058X |
| Author | : James E. Mark |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 1050 |
| Release | : 2007-03-21 |
| Genre | : Technology & Engineering |
| ISBN | : 0387690026 |
This book offers concise information on the properties of polymeric materials, particularly those most relevant to physical chemistry and chemical physics. Extensive updates and revisions to each chapter include eleven new chapters on novel polymeric structures, reinforcing phases in polymers, and experiments on single polymer chains. The study of complex materials is highly interdisciplinary, and new findings are scattered among a large selection of scientific and engineering journals. This book brings together data from experts in the different disciplines contributing to the rapidly growing area of polymers and complex materials.
| Author | : George P. Simon |
| Publisher | : Routledge |
| Total Pages | : 865 |
| Release | : 2019-07-16 |
| Genre | : Technology & Engineering |
| ISBN | : 1351423614 |
Distinguishing among blends, alloys and other types of combinations, clarifying terminology and presenting data on new processes and materials, this work present up-to-date and effective compounding techniques for polymers. It offers extensive analyses on the challenging questions that surround miscibility, compatibility, dynamic processing, interaction/phase behaviour, and computer simulations for predicting behaviours of polymer mixture and interaction.
| Author | : A. M. Donald |
| Publisher | : Cambridge University Press |
| Total Pages | : 616 |
| Release | : 2006-05-11 |
| Genre | : Science |
| ISBN | : 9780521580014 |
A 2006 edition explaining the underlying science and applications of liquid crystalline polymers.
| Author | : Andreea Irina Barzic |
| Publisher | : CRC Press |
| Total Pages | : 278 |
| Release | : 2016-09-19 |
| Genre | : Science |
| ISBN | : 131535098X |
Phase morphology in multicomponent polymer-based systems represents the main physical characteristic that allows for control of the material design and implicitly the development of new plastics. Emphasizing properties of these promising new materials in both solution and solid phase, this book describes the preparation, processing, properties, and practical implications of advanced multiphase systems from macro to nanoscales. It covers a wide range of systems including copolymers, polymer blends, polymer composites, gels, interpenetrating polymers, and layered polymer/metal structures, describing aspects of polymer science, engineering, and technology. The book analyzes experimental and theoretical aspects regarding the thermal and electrical transport phenomena and magnetic properties of crucial importance in advanced technologies. It reviews the most recent advances concerning morphological, rheological, interfacial, physical, fire-resistant, thermophysical, and biomedical properties of multiphase polymer systems. Concomitantly the book deals with basic investigation techniques that are sensitive in elucidating the features of each phase. It also discusses the latest research trends that offer new solutions for advanced bio- and nanotechnologies. Introduces an overview of recent studies in the area of multiphase polymer systems, their micro- and nanostructural evolutions in advanced technologies, and provides future outlooks, new challenges and opportunities. Discusses multicomponent structures that offer enhanced physical, mechanical, thermal, electrical, magnetic, and optical properties adapted to current requirements of modern technologies. Covers a wide range of materials, such as composites, blends, alloys, gels and interpenetrating polymer networks. Presents new strategies for controlling the micro- and nanomorphology and the mechanical properties of multiphase polymeric materials. Describes different applications of multiphase polymeric materials in various fields, including automotive, aeronautics and space industry, displays, and medicine.
