Assignment of the Glass Transition - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Assignment of the Glass Transition write by Rickey J. Seyler. This book was released on 1994. Assignment of the Glass Transition available in PDF, EPUB and Kindle.
Glass Transition of a Liquid Crystal Polymer
Glass Transition of a Liquid Crystal Polymer - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Glass Transition of a Liquid Crystal Polymer write by B. Cassel. This book was released on 1994. Glass Transition of a Liquid Crystal Polymer available in PDF, EPUB and Kindle. A commercially available liquid crystal polymer system having a very weak glass transition is investigated in order to illustrate the special problems of measurement and interpretation inherent in high-sensitivity Tg measurement. Differential scanning calorimetry, thermomechanical analysis, and dynamic mechanical analysis were employed over the temperature region from ambient to 175°C. A transition between 75 and 125°C with a midpoint around 100°C was detected by most techniques. The use of the maximum in the derivative of the measured signal as the primary assignment of the glass transition temperature is recommended. The results are discussed with reference to other literature on this polymer system.
Liquid Crystal Polymers: From Structures to Applications
Liquid Crystal Polymers: From Structures to Applications - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Liquid Crystal Polymers: From Structures to Applications write by A.A. Collyer. This book was released on 2012-12-06. Liquid Crystal Polymers: From Structures to Applications available in PDF, EPUB and Kindle. 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.
Mechanical and Thermophysical Properties of Polymer Liquid Crystals
Mechanical and Thermophysical Properties of Polymer Liquid Crystals - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Mechanical and Thermophysical Properties of Polymer Liquid Crystals write by Witold Brostow. This book was released on 2013-11-27. Mechanical and Thermophysical Properties of Polymer Liquid Crystals available in PDF, EPUB and Kindle. 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.
Recent Advances in Liquid Crystalline Polymers
Recent Advances in Liquid Crystalline Polymers - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Recent Advances in Liquid Crystalline Polymers write by L. L. Chapoy. This book was released on 2012-12-06. Recent Advances in Liquid Crystalline Polymers available in PDF, EPUB and Kindle. This volume contains an eclectic collection of 22 papers on liquid crystalline polymers presented at the Sixth Polymer Workshop, in the series sponsored by the European Science Foundation, entitled: 'Liquid Crystal Polymer Systems', in Gentofte, Denmark, 12-14 September 1983. Since a contribution to this volume was strictly voluntary, and in some cases represents a considerably expanded version of that which was presented, it is strictly speaking not correct to term this a 'proceedings'. A description of the aims and purposes of the European Science Foundation with respect to the polymer area has been presented in: Shell Polymers, Vol. 5, No.2, pp. 34-35, 1981. The papers given here represent a cross-section of current research interests in liquid crystalline polymers in the areas of theory, synthesis, characterization, structure-property relationships and applications. At least some of the current interest is motivated by attempts to practically exploit the novel properties of these materials in the developing tech nologies of high strength fibres and advanced materials for constructional purposes, but also for functional materials in the areas of information retrieval, electronics and opto-electronics applications. The editor wishes to thank all those involved for their courtesy and co-operation.
