Polymer Thermodynamics by Gas Chromatography
Polymer Thermodynamics by Gas Chromatography

Author: R. Vîlcu

Publisher: Elsevier

Published: 2012-12-02

Total Pages: 212

ISBN-13: 0444597433

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This book presents direct and inverse gas chromatography as a powerful tool for determining a great number of thermodynamic properties and quantities for micro- and especially for macromolecular substances. In order to ensure the continuity and clarity of the presentation, the book first considers some frequently used concepts of chromatography with a mobile gas phase, i.e. the mechanism of separation, retention parameters and the theories of gas chromatography. The employment of this technique as an important method of studying solutions through the most representative statistical models is also discussed. The thermodynamics of direct gas chromatography, as applied to dissolution, adsorption and vaporization underlies the thermodynamic treatment of inverse gas chromatography. The most extensive chapter of the book is devoted to the thermodynamics of inverse gas chromatography and deals with a number of important topics: phase transitions in crystalline-amorphous polymers and liquid crystals, glass transitions, other second order transitions in polymers, the determination of diffusion coefficients, the segregation of block copolymers and other applications.This book is intended for those specialists in research and industry who are concerned with the modification and characterization of polymers, with establishing polymer applications, and with the processing of polymers. It will also be useful to students and specialists interested in the physico-chemical basis of the phenomena involved in gas chromatography in general and its inverse variant in particular.

Polymer Melt Fracture
Polymer Melt Fracture

Author: Rudy Koopmans

Publisher: CRC Press

Published: 2010-08-03

Total Pages: 344

ISBN-13: 1420018280

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The continually growing plastics market consists of more than 250 million tons of product annually, making the recurring problem of polymer melt fracture an acute issue in the extrusion of these materials. Presenting a pictorial library of the different forms of melt fracture and real industrial extrusion melt fracture phenomena, Polymer Melt Fract

Liquid Crystal Dispersions
Liquid Crystal Dispersions

Author: Paul S. Drzaic

Publisher: World Scientific

Published: 1995

Total Pages: 450

ISBN-13: 9789810217457

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Polymer-dispersed liquid crystal (PDLC) materials are of interest both for their potential in display technology and the fascinating science found in liquid crystals confined to small cavities. Liquid Crystal Dispersions is a comprehensive overview of the science and technology of this new class of materials. Topics covered include formation of PDLC devices, a catalog of droplet structures and transformations, device electro-optical properties, and applications. Liquid Crystal Dispersions will be of value to the nonspecialists keen on gaining an overview of this new field, as well as to specialists interested in a comprehensive review of work in this area.

Liquid Crystals and Display Technology
Liquid Crystals and Display Technology

Author: Morteza Sasani Ghamsari

Publisher: BoD – Books on Demand

Published: 2020-10-07

Total Pages: 200

ISBN-13: 1789853672

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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.

Thermodynamics of Systems Containing Flexible-Chain Polymers
Thermodynamics of Systems Containing Flexible-Chain Polymers

Author: V.J. Klenin

Publisher: Elsevier

Published: 1999-06-03

Total Pages: 851

ISBN-13: 0080542832

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This book deals with the problems of the thermodynamics of systems containing flexible-chain polymers as the basis of polymer material science. The main thermodynamic quantities and concepts are introduced and discussed in the order of the objects getting more and more complicated: gases, magnets, low-molecular-weight substances and mixtures, and finally, polymers and polymer blends.All topics are considered in a common clue, using the principle of universality. The stability conditions for the one-phase state of multi-component systems are given. Phase separation is regarded as a result of loss in stability. The critical state of a system, with the one-phase state being close to the boundary of stability conditions breaking, is discussed in detail. The effects of both light scattering (elastic and dynamic) and diffusion, as directly depending on the thermodynamic parameters characterizing the one-phase state stability, are considered in detail. One of the versions of colloid scattering, namely, the turbidity spectrum method, is described as useful for the characterization of various heterogeneous structures and for the phase analysis of polymer systems. In the approximation of mean field theories and advanced field theory, formalisms expound the following divisions of the thermodynamics of binary and polynary systems with flexible-chain polymers: conformation of the polymer coil, composition fluctuations, elastic and dynamic light scattering, diffusion in the one-phase state (including the critical range), phase separation, polymer fractionation, the coil-globule transition, phase equilibrium and separation in the system network polymer + low-molecular-weight liquid, polymer blends and multiphase separation.

Phase Separation of Liquid Crystals in Polymers
Phase Separation of Liquid Crystals in Polymers

Author: John L. West

Publisher:

Published: 1988

Total Pages: 13

ISBN-13:

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New optoelectronic materials based on polymer dispersed liquid crystals (PDLC) show great potential for application in displays, temperature sensors, optical computing and for solar energy control. We report liquid crystals, thermoset or thermoplastic materials. PDLC materials may be formed by several different processes. The liquid crystal may be dissolved in low molecular weight polymer precursors, in a thermoplastic melt or with a thermoplastic in a common solvent. Subsequent polymerization, cooling of the polymer melt or solvent evaporation lead to liquid crystal immiscibility, droplet formation and growth, and polymer gelation. The optoelectronic properties of these materials are affected by the droplet morphology. Specific examples are presented for each of these processes and it is demonstrated how the droplet morphology for density, and thus device performance, can be controlled by each method. (jes).

Phase Transitions and Structure of Polymer Systems in External Fields
Phase Transitions and Structure of Polymer Systems in External Fields

Author: Sergey A. Vshivkov

Publisher: Cambridge Scholars Publishing

Published: 2019-05-14

Total Pages: 381

ISBN-13: 1527534561

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Generalized extensive experimental and theoretical data regarding the phase transitions of polymer systems in mechanical and magnetic fields provide the possibility to predict the results of external field effects on the structure and mutual solubility of components. The data on dynamic structuring in deformed polymer blends and solutions allow for the use of found regularities by the processing of polymer systems. The methods offered in this book allow for the connection of shift of phase diagrams in the mechanical field with changes in macromolecule sizes. The tutorials described here will help the reader to correctly build the phase diagrams of polymer systems using a variety of methods.