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Author :
Publisher :
ISBN 13 :
Total Pages : 242 pages
Book Rating : 4.:/5 (912 download)
Download or read book On the Evolution of Phase Separation in Polymer Blends written by and published by . This book was released on 2005 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sam Coveney
Publisher : Springer
ISBN 13 : 3319193996
Total Pages : 179 pages
Book Rating : 4.3/5 (191 download)
Download or read book Fundamentals of Phase Separation in Polymer Blend Thin Films written by Sam Coveney and published by Springer. This book was released on 2015-06-18 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work sheds new light on fundamental aspects of phase separation in polymer-blend thin films. A key feature underlying the theoretical models is the unification of one-dimensional thermodynamic phase equilibria with film evolution phenomena in two- and three dimensions. Initially, an established 'phase portrait' method, useful for visualising and calculating phase equilibria of polymer-blend films, is generalised to systems without convenient simplifying symmetries. Thermodynamic equilibria alone are then used to explain a film roughening mechanism in which laterally coexisting phases can have different depths in order to minimise free energy. The phase portraits are then utilised to demonstrate that simulations of lateral phase separation via a transient wetting layer, which conform very well with experiments, can be satisfactorily explained by 1D phase equilibria and a 'surface bifurcation' mechanism. Lastly, a novel 3D model of coupled phase separation and dewetting is developed, which demonstrates that surface roughening shadows phase separation in thin films.
Author : Chen Kuang
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.:/5 (958 download)
Download or read book Double-stage Phase Separation in Dynamically Asymmetric Ternary Polymer Blends written by Chen Kuang and published by . This book was released on 2016 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phase separation in complex fluids such as polymers has been the subject of several experimental and theoretical studies in recent years. Understanding the phase separation mechanisms and controlling morphological evolution are very important for designing various advanced materials with novel mechanical, optical, electrical, and transport properties. In polymer blends, dynamic asymmetry is induced by a large difference in glass transition temperature. In this work, phase separation behavior of ternary blends of polystyrene/poly(vinyl methyl ether)/polyisoprene, PS/PVME/PI, and polystyrene/poly(vinyl methyl ether)/poly(ethyl methacrylate), PS/PVME/PEMA are investigated. Ternary blends of PS/PVME/PI and PS/PVME/PEMA exhibit complex phase separation behavior since PS and PVME have a lower critical solution temperature (LCST) behavior, while PI and PS (or PVME), PEMA and PS (or PVME) have upper critical solution temperature (UCST) behavior. 2D and 3D phase diagrams for these two ternary systems were plotted by both Flory-Huggins incompressible and regular solution compressible models. Casting the solutions of PS/PVME/PI and PS/PVME/PEMA blends form two phase-separated domains in most compositions: (i) PI-rich or PEMA rich, and (ii) PS/PVME-rich. Post-annealing of such samples leads to the second-stage phase separation due to unfavorable interaction of PS and PVME at temperatures about 100°C. Such behavior that is observed for the first time provides a new potential method for making different morphologies with the same system by changing annealing parameters and composition. Washing one polymer at a time using a selective solvent is used to study the morphology of ternary blends. Optical microscopy and scanning electron microscopy are used to study the kinetics and morphology of viscoelastic phase separation (VPS) in ternary blends.
Author : Amy Adams Lefebvre
Publisher :
ISBN 13 :
Total Pages : 332 pages
Book Rating : 4.:/5 (34 download)
Download or read book Initial Stages of Phase Separation in Polymer Blends Near the Limit of Metastability written by Amy Adams Lefebvre and published by . This book was released on 2002 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dahn Katzen
Publisher :
ISBN 13 :
Total Pages : 101 pages
Book Rating : 4.:/5 (652 download)
Download or read book Phase Separation in Polymer Blends written by Dahn Katzen and published by . This book was released on 1992 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Daniel J. Duffy
Publisher :
ISBN 13 :
Total Pages : 684 pages
Book Rating : 4.:/5 (548 download)
Download or read book Evolution of Phase Behavior and Dynamics in Reactive Polymer Blends written by Daniel J. Duffy and published by . This book was released on 2003 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kam-Wa (Danny) Lee
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (436 download)
Download or read book Effect of Temperature and Shear on Phase Separation in Liquid Crystalline Polymer/polycarbonate Blends written by Kam-Wa (Danny) Lee and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Karl Freed
Publisher : Springer Science & Business Media
ISBN 13 : 9783540256809
Total Pages : 224 pages
Book Rating : 4.2/5 (568 download)
Download or read book Phase Behavior of Polymer Blends written by Karl Freed and published by Springer Science & Business Media. This book was released on 2005-09-01 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stephen Z.D. Cheng
Publisher : Elsevier
ISBN 13 : 0080558208
Total Pages : 325 pages
Book Rating : 4.0/5 (85 download)
Download or read book Phase Transitions in Polymers: The Role of Metastable States written by Stephen Z.D. Cheng and published by Elsevier. This book was released on 2008-09-10 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: A classical metastable state possesses a local free energy minimum at infinite sizes, but not a global one. This concept is phase size independent. We have studied a number of experimental results and proposed a new concept that there exists a wide range of metastable states in polymers on different length scales where their metastability is critically determined by the phase size and dimensionality. Metastable states are also observed in phase transformations that are kinetically impeded on the pathway to thermodynamic equilibrium. This was illustrated in structural and morphological investigations of crystallization and mesophase transitions, liquid-liquid phase separation, vitrification and gel formation, as well as combinations of these transformation processes. The phase behaviours in polymers are thus dominated by interlinks of metastable states on different length scales. This concept successfully explains many experimental observations and provides a new way to connect different aspects of polymer physics.* Written by a leading scholar and industry expert* Presents new and cutting edge material encouraging innovation and future research* Connects hot topics and leading research in one concise volume
Author : Hao Wang
Publisher :
ISBN 13 :
Total Pages : 295 pages
Book Rating : 4.:/5 (187 download)
Download or read book Wetting and Phase Separation in Thin Film Polymer Blends written by Hao Wang and published by . This book was released on 1999 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hiteshkumar Fruitwala
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (62 download)
Download or read book Phase Separation in Polymer Blends and Its Effects on Mechanical Properties written by Hiteshkumar Fruitwala and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Pankaj Jaiprakash Rathi
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.:/5 (778 download)
Download or read book Theoretical Modeling of Morphology Development in Blends of Semicrystalline Polymers Undergoing Photopolymerization written by Pankaj Jaiprakash Rathi and published by . This book was released on 2009 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Photopolymerization induced phase transitions in the blends of semicrystalline polymers is a recently discovered field which could be used in developing a new class of functional materials by manipulating their properties through an understanding of morphology evolution. This dissertation presents a thermodynamic framework along with phase diagram to predict the morphology evolution in semicrystalline polymer blends. The model uses reaction diffusion equations based on time dependent Ginzburg Landau (TDGL) theory in conjunction with energy conservation equation. A method was developed to obtain the crystal-amorphous interaction parameter in these blends based on experimental melting point depression data and the interaction parameter was further used in calculating phase diagrams by combining it with the phase field model of crystallization and Flory-Huggins theory. The role of competition between phase separation and crystallization during morphology evolution is predicted based on such a phase diagram. The phase field model is extended to the blends of crystalline polyethylene oxide (PEO) and a reactive triacrylate monomer undergoing photopolymerization. Melting temperature of PEO is lowered in blends with the monomer and the photopolymerization reaction is carried our [sic] in the isotropic melt state just above the depressed melting temperature. Polymerization causes the depressed melting point of PEO to rise above the reaction temperature thus simultaneously triggering crystallization and the increase in molecular weight of the reactive component leading to phase separation. A unified phase field model presented here predicts the elevation of the originally depressed melting point, phase diagram and morphology evolution in the above blends. Furthermore, the photopolymerizing blends of PEO and diacrylate when subjected to intensity gradient show directional crystal growth. This has been modeled using various intensity profiles ranging from linear intensity gradient to interference pattern created by laser. Sharpness of the intensity profiles were shown to subject the crystal growth to confinement."--Abstract.
Author : Sabu Thomas
Publisher : John Wiley & Sons
ISBN 13 : 3527331530
Total Pages : 972 pages
Book Rating : 4.5/5 (273 download)
Download or read book Characterization of Polymer Blends written by Sabu Thomas and published by John Wiley & Sons. This book was released on 2015-02-09 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filling the gap for a reference dedicated to the characterization of polymer blends and their micro and nano morphologies, this book provides comprehensive, systematic coverage in a one-stop, two-volume resource for all those working in the field. Leading researchers from industry and academia, as well as from government and private research institutions around the world summarize recent technical advances in chapters devoted to their individual contributions. In so doing, they examine a wide range of modern characterization techniques, from microscopy and spectroscopy to diffraction, thermal analysis, rheology, mechanical measurements and chromatography. These methods are compared with each other to assist in determining the best solution for both fundamental and applied problems, paying attention to the characterization of nanoscale miscibility and interfaces, both in blends involving copolymers and in immiscible blends. The thermodynamics, miscibility, phase separation, morphology and interfaces in polymer blends are also discussed in light of new insights involving the nanoscopic scale. Finally, the authors detail the processing-morphology-property relationships of polymer blends, as well as the influence of processing on the generation of micro and nano morphologies, and the dependence of these morphologies on the properties of blends. Hot topics such as compatibilization through nanoparticles, miscibility of new biopolymers and nanoscale investigations of interfaces in blends are also addressed. With its application-oriented approach, handpicked selection of topics and expert contributors, this is an outstanding survey for anyone involved in the field of polymer blends for advanced technologies.
Author : Eric J. Amis
Publisher : DIANE Publishing
ISBN 13 : 0788171836
Total Pages : 55 pages
Book Rating : 4.7/5 (881 download)
Download or read book Joint Meeting on Multicomponent Polymers and Polyelectrolytes written by Eric J. Amis and published by DIANE Publishing. This book was released on 1998-07 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a conference organized by Polymer Blends & Processing Group, National Institute of Standards & Technology (NIST), Hashimoto Polymer Phasing Project, Exploratory Research for Advanced Technology (ERATO), & Japan Science & Technology Corporation (JST). Includes plenary lectures on phase transitions & ordering processes & polymer blends processing; & lectures in the areas of structure & morphology, phase separation, polyelectrolytes, & surfaces & interfaces.
Author : David Qiwei He
Publisher :
ISBN 13 :
Total Pages : 205 pages
Book Rating : 4.:/5 (115 download)
Download or read book Phase Separation and the Design of Polymer Blends written by David Qiwei He and published by . This book was released on 1996 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James Grant Connell
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (141 download)
Download or read book Equilibrium and Kinetic Aspects of Phase Separation in Polymer Blends and Diblock Copolymers written by James Grant Connell and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Andreea Irina Barzic
Publisher : CRC Press
ISBN 13 : 149875564X
Total Pages : 384 pages
Book Rating : 4.4/5 (987 download)
Download or read book Multiphase Polymer Systems written by Andreea Irina Barzic and published by CRC Press. This book was released on 2016-09-19 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
