Synthesis and Characterisation of New Polymerisable Mesogens Containing Fluorene Moieties PDF Download
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Author: Philipp Gebhardt
Publisher: diplom.de
ISBN: 3836627302
Category : Medical
Languages : en
Pages : 96
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Book Description
Inhaltsangabe:Introduction: Liquid crystals present an intermediate state of matter. In a liquid the molecules are in contact but are able to move past each other. In a crystal the molecules are not able to move past one another, they are incorporated in the cystalline lattice, giving the system a long-range order. In nematic liquid crystals, the molecules are arranged in such a way that their longitudinal axes are mutually parallel but they are easily able to move in the direction of their longitudinal axes. Thus, liquid properties like fluidity and viscosity as well as optic properties that are shown by crystals like the reflection of different colours depending on the viewing angle are observed simultaneously. The incorporation of photopolymerisable groups provides monomers for temperature independent polymerisation. After polymerisation in the LC phase and subsequent cooling, the molecular orientation within the system can be frozen in, thus, materials with special qualities can be obtained. These materials have direction-depending optical and mechanical properties consequently they represent an area of scientific interest and technological potential. In the present work three new mesogens, molecules with liquid crystalline behaviour in a determined temperature range were synthesized. They have the above illustrated structure. One of them is a direactive monomer for the creation of a threedimensional network. Due to their structure, the compounds show fluorescence and are suitable for new materials with application in electro-optical devices like LCDs. The present thesis describes the synthesis of the new mesogens and their characterisation with FT-IR, 1H and 13C NMR. The influence of the molecular structure on the thermotropic properties is discussed and the liquid crystalline properties are examined by polarisation microscopy and DSC. Moreover, ways for obtaining and characterising orientated thin films are bescribed. Inhaltsverzeichnis:Table of Contents: Table of Abbreviations1 1.Introduction2 1.1Liquid Crystals: Structure and Properties2 1.2Classification of Liquid Crystals6 1.3Applications of Liquid Crystals8 1.4Liquid Crystalline Polymers and their Application11 1.5Luminescence13 1.6Aim and Scope of the present Thesis15 2.Results and Discussion17 2.1Synthetic pathways to the new LC fluorene derivatives17 2.2Structural Characterisation of the fluorene derivates20 2.3Differential Scanning Calorimetry27 2.4Polarisation [...]
Author: Philipp Gebhardt
Publisher: diplom.de
ISBN: 3836627302
Category : Medical
Languages : en
Pages : 96
Get Book Here
Book Description
Inhaltsangabe:Introduction: Liquid crystals present an intermediate state of matter. In a liquid the molecules are in contact but are able to move past each other. In a crystal the molecules are not able to move past one another, they are incorporated in the cystalline lattice, giving the system a long-range order. In nematic liquid crystals, the molecules are arranged in such a way that their longitudinal axes are mutually parallel but they are easily able to move in the direction of their longitudinal axes. Thus, liquid properties like fluidity and viscosity as well as optic properties that are shown by crystals like the reflection of different colours depending on the viewing angle are observed simultaneously. The incorporation of photopolymerisable groups provides monomers for temperature independent polymerisation. After polymerisation in the LC phase and subsequent cooling, the molecular orientation within the system can be frozen in, thus, materials with special qualities can be obtained. These materials have direction-depending optical and mechanical properties consequently they represent an area of scientific interest and technological potential. In the present work three new mesogens, molecules with liquid crystalline behaviour in a determined temperature range were synthesized. They have the above illustrated structure. One of them is a direactive monomer for the creation of a threedimensional network. Due to their structure, the compounds show fluorescence and are suitable for new materials with application in electro-optical devices like LCDs. The present thesis describes the synthesis of the new mesogens and their characterisation with FT-IR, 1H and 13C NMR. The influence of the molecular structure on the thermotropic properties is discussed and the liquid crystalline properties are examined by polarisation microscopy and DSC. Moreover, ways for obtaining and characterising orientated thin films are bescribed. Inhaltsverzeichnis:Table of Contents: Table of Abbreviations1 1.Introduction2 1.1Liquid Crystals: Structure and Properties2 1.2Classification of Liquid Crystals6 1.3Applications of Liquid Crystals8 1.4Liquid Crystalline Polymers and their Application11 1.5Luminescence13 1.6Aim and Scope of the present Thesis15 2.Results and Discussion17 2.1Synthetic pathways to the new LC fluorene derivatives17 2.2Structural Characterisation of the fluorene derivates20 2.3Differential Scanning Calorimetry27 2.4Polarisation [...]
Author: Dietrich Braun
Publisher: Springer Science & Business Media
ISBN: 3540268901
Category : Science
Languages : en
Pages : 401
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Book Description
The first English edition of this book was pubUshed in 1971 with the late Prof. Dr. Werner Kern as coauthor. In 1997, for the preparation of the third edition, Prof. Dr. Helmut Ritter joined the team of authors and in 2001 Prof. Dr. Brigitte Voit and Prof. Dr. Matthias Rehahn complemented this team. The change in authors has not altered the basic concept of this 4th edition: again we were not aimed at compiling a comprehensive collection of recipes. In stead, we attempted to reach a broader description of the general methods and techniques for the synthesis, modification, and characterization of macromo- cules, supplemented by 105 selected and detailed experiments and by sufficient theoretical treatment so that no additional textbook be needed in order to under stand the experiments. In addition to the preparative aspects we have also tried to give the reader an impression of the relation of chemical structure and mor phology of polymers to their properties, as well as of areas of their application.
Author: H.R. Kricheldorf
Publisher: Springer Science & Business Media
ISBN: 3642791751
Category : Technology & Engineering
Languages : en
Pages : 507
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Book Description
Silicon in Polymer Synthesis gives the first concise overview of silicon used for the synthesis and modification of polymers. The first section gives an introduction to the topic. The subsequent chapters detail the current status both from the basic research as well as from the industrial application points of view.
Author: Mario Leclerc
Publisher: John Wiley & Sons
ISBN: 9783527629794
Category : Technology & Engineering
Languages : en
Pages : 379
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Book Description
This first systematic compilation of synthesis methods for different classes of polymers describes well-tested and reproducible procedures, thus saving time, money and chemicals. Each chapter presents the latest method for a specific class of conjugated polymers with a particular emphasis on the design aspects for organo-electronic applications. In this concise and practically oriented manner, readers are introduced to the strategies of influencing and controlling the polymer properties with respect to their use in the desired device. This style of presentation quickly helps researchers in their daily lab work and prevents them from reinventing the wheel over and over again.
Author: Gulzhian I. Dzhardimalieva
Publisher: Springer
ISBN: 3319560247
Category : Technology & Engineering
Languages : en
Pages : 1036
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Book Description
This book deals with the chemistry of polymeric metal chelates. The main results and the production and chemical structure of polymers with chelate units as well as the specificity of metal complex binding of different structure are presented here. This book also reveals the transformations which components undergo in the course of chelation. Special attention is paid not only to synthetic but also to natural (including living) systems. The usage of polymeric metal chelates and their development are examined. The related research was performed for chelates with chain structure. This book is useful to researchers being active in synthesis and design of macromolecular metal chelates
Author: A. Ravve
Publisher: Springer Science & Business Media
ISBN: 0387364145
Category : Technology & Engineering
Languages : en
Pages : 377
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Book Description
This book combines theoretical explanations of the reactions of light and polymeric materials with development of light responsive polymeric materials for various practical applications. Photo associated reactions and light responsive materials have great potential to improve existing industrial processes, including capturing solar energy. This book presents a range of reactions and materials with some of the most exciting current and future applications.
Author: Mark Warner
Publisher: Oxford University Press
ISBN: 9780199214860
Category : Mathematics
Languages : en
Pages : 423
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Book Description
This text is a primer for liquid crystals, polymers, rubber and elasticity. It is directed at physicists, chemists, material scientists, engineers and applied mathematicians at the graduate student level and beyond.
Author: Peter Bamfield
Publisher: Royal Society of Chemistry
ISBN: 1782628150
Category : Art
Languages : en
Pages : 812
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Book Description
Chromic or colour related phenomena are produced in response to a chemical or physical stimulus. This new edition will update the information on all those areas where chemicals or materials interact with light to produce colour, a colour change, or luminescence especially in the imaging, analysis, lighting and display areas. The book has been restructured to show greater emphasis on applications where 'coloured' compounds are used to transfer energy or manipulate light in some way therefore reducing the details on classical dyes and pigments. In the past eight years, since the previous edition, there has been a remarkable increase in the number of papers and reviews being produced reflecting the growth of interest in this area. This ongoing research interest is matched by a large number of new technological applications gaining commercial value covering e.g. biomedical areas, energy, data storage, physical colour, bio-inspired materials and photonics. This book appeals to industrial chemists, professionals, postgraduates and as high level recommended reading for colour technology courses.
Author: I. Hamerton
Publisher: Springer Science & Business Media
ISBN: 9401113262
Category : Technology & Engineering
Languages : en
Pages : 374
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Book Description
After epoxy resins and polyimides, cyanate esters arguably form the most well-developed group of high-temperature, thermosetting polymers. They possess a number of desirable performance characteristics which make them of increasing technological importance, where their somewhat higher costs are acceptable. The principal end uses for cyanate esters are as matrix resins for printed wiring board laminates and structural composites. For the electronics markets, the low dielectric loss characteristics, dimen sional stability at molten solder temperatures and excellent adhesion to conductor metals at temperatures up to 250°C, are desirable. In their use in aerospace composites, unmodified cyanate esters offer twice the frac ture toughness of multifunctional epoxies, while achieving a service tem perature intermediate between epoxy and bis-maleimide capabilities. Applications in radome construction and aircraft with reduced radar signatures utilize the unusually low capacitance properties of cyanate esters and associated low dissipation factors. While a number of commercial cyanate ester monomers and prepoly mers are now available, to date there has been no comprehensive review of the chemistry and recent technological applications of this versatile family of resins. The aims of the present text are to present these in a com pact, readable form. The work is primarily aimed at materials scientists and polymer technologists involved in research and development in the chemical, electronics, aerospace and adhesives industries. It is hoped that advanced undergraduates and postgraduates in polymer chemistry and technology, and materials science/technology will find it a useful introduc tion and source of reference in the course of their studies.
Author: Morteza Sasani Ghamsari
Publisher: BoD – Books on Demand
ISBN: 1789853672
Category : Science
Languages : en
Pages : 200
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Book Description
Liquid crystals have attracted scientific attention for potential applications in advanced devices. Display technology is continuously growing and expanding and, as such, this book provides an overview of the most recent advances in liquid crystals and displays. Chapters cover such topics as nematic liquid crystals, active matrix organic light-emitting diodes, and tetradentate platinum(II) emitters, among others.
