Search results for: structure-of-the-polymer-amorphous-state

Structure of the Polymer Amorphous State

Author : Kozlov
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The basic problem of polymer physics is obtaining â ~structure-propertiesâ (TM) correlations for their future application for practical purposes. However, these cannot be obtained without the development of a quantitative model of the polymer structure. This problem has been actively investigated during the last 45 years, which resulted in obtaining a great amount of experimental (mostly indirect) proofs of existence of the local order in the polymer amorphous state. Now, the time has come for creating a structural model of polymer basing based on the local order ideas. The cluster model, as presented in this monograph, of the polymer amorphous state structure represents the realization of such attempts. The development of this cluster model is based on well-known experimental observation: the behavior of glassy polymers in the area of stimulated high-elasticity plateau is described in the framework of rubber elasticity concepts. This gives an opportunity to present the local order (cluster) zone as a multifunctional entanglement of the physical network consisting of several collinear closely packed segments of different macromolecules (the amorphous analogue of crystallite with extended chains) and surrounded by a packless matrix. An independent method for assessing local order zone fraction in the structure has been elaborated. Segment length in the cluster equals the length of the chain statistical segment that gives a correlation between molecular and structural parameters of the polymer. Application of the cluster model allowed description and obtaining of analytical â ~structure-propertiesâ (TM) correlations for many processes proceeding in polymers: elasticity, yielding, degradation, transport, some thermodynamic processes, structural relaxation, plasticization, structural stabilization at thermo-oxidative degradation, etc. The relation between the cluster model and some modern physical concepts, for instance fractal analysis, fluctuation free volume kinetic

Structure of the Polymer Amorphous State

Author : Kozlov
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The basic problem of polymer physics is obtaining a ‘structure-propertiesa correlations for their future application for practical purposes. However, these cannot be obtained without the development of a quantitative model of the polymer structure.This problem has been actively investigated during the last 45 years, which resulted in obtaining a

Order in the Amorphous State of Polymers

Author : Steven E. Keinath
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In 1975, a symposium was held in Midland, Michigan, co-sponsored by the Dow Chemical Company and the then Midland Macromolecular Institute in honor of Raymond F. Boyer on the occasion of his 65th birthday and retirement from Dow. The topic of that first Boyer symposium dealt with an area of interest to Boyer, namely, polymer transitions and relaxations. One decade later, after ten years of additional fruitful scientific endeavor at MMI, Ray Boyer was again honored with a symposium, this time celebrating his 75th birthday and 10th anniversary at the Michigan Molecular Institute. The topic of the second Boyer symposium in 1985 was somewhat more focused, this time concentrating on the subject of order (or structure) in the amorphous state of polymers and the attendant polymer transitions that are observed. This volume contains the full manuscripts of the contributors to the 17th MMI International Symposium, held in Midland, Michigan on August 18-21, 1985. Eleven one-hour plenary lectures and ten 20-minute contributed papers were presented during the Symposium. An open forum panel discussion was also scheduled; the edited transcript of that session is included at the end of this volume. One of our tasks in organizing this Symposium was to attempt to gather together a number of speakers who would be able to define what, if any, physical structure might be present in anwrplwus polymers and what the nature of this order might be.

Physical Structure of the Amorphous State

Author : Geoffrey Allen
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The Fractal Physical Chemistry of Polymer Solutions and Melts

Author : G. V. Kozlov
File Size : 86.27 MB
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This book provides an important structural analysis of polymer solutions and melts, using fractal analysis. The book covers the theoretical fundamentals of macromolecules fractal analysis. It then goes on to discuss the fractal physics of polymer solutions and the fractal physics of melts. The intended audience of the book includes specialists in chemistry and physics of polymer synthesis and those in the field of polymers and polymer composites processing.

Materials Behavior

Author : Mihai Ciocoiu
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The development of advanced materials has become extremely important in the last decade, being widely used in academic and industrial research. This book examines the potential of advanced materials as well as nanotechnology to improve fiber science from fibril to fabric mode, to create better materials and products for a variety of aspects. The book presents research advances in materials behavior using fractal analysis, mathematical modeling and simulation, and other methods. Examined are electrical, mechanical, optical, and magnetic properties; size; morphology; and chemical behavior of such materials as aerogels, polymer films, nanocomposite materials, natural composites, catalysis, and more with a view to their application in the medical, engineering, and textile fields. With chapters written by eminent scientists, the book offers valuable information for academics, researchers, and engineering professionals. Contributions range from new methods to novel applications of existing methods to help readers gain understanding of the material and/or structural behavior of new and advanced systems.

Advanced Non Classical Materials with Complex Behavior

Author : Gennady E. Zaikov
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This book has an important role in advancing non-classical materials on the macro and nanoscale. The book provides original, theoretical, and important experimental results. Some research uses non-routine methodologies often unfamiliar to some readers. Furthermore, papers on novel applications of more familiar experimental techniques and analyses of composite problems are included. This book brings together research contributions from eminent experts on subjects that have gained prominence in material and chemical engineering and science. It presents the last developments along with case studies, explanatory notes, and schematics for clarity and enhanced understanding. The book includes new research and studies, including: • New research on the efficiency of gas purification • The transport properties of films of chitosan-amikacin • Operating conditions of clearing of gas in a rotoklon • Properties and characteristics of varies materials and compounds Professors and instructors and postgraduate students focusing on adhesive interaction improvement will find the book valuable, as will industry professionals.

The Fractal Physics of Polymer Synthesis

Author : G. V. Kozlov
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Using fractal analysis, irreversible aggregation models, synergetics, and percolation theory, this book describes the main reactions of high-molecular substances. It is the first to give the structural and physical grounds of polymers synthesis and curing based on fractal analysis. It provides a single equation for describing the relationship between the reaction rate constants and the equilibrium constants with the nature of the medium.

Introduction to Polymers Third Edition

Author : Robert J. Young
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Thoroughly updated, Introduction to Polymers, Third Edition presents the science underpinning the synthesis, characterization and properties of polymers. The material has been completely reorganized and expanded to include important new topics and provide a coherent platform for teaching and learning the fundamental aspects of contemporary polymer science. New to the Third Edition Part I This first part covers newer developments in polymer synthesis, including ‘living’ radical polymerization, catalytic chain transfer and free-radical ring-opening polymerization, along with strategies for the synthesis of conducting polymers, dendrimers, hyperbranched polymers and block copolymers. Polymerization mechanisms have been made more explicit by showing electron movements. Part II In this part, the authors have added new topics on diffusion, solution behaviour of polyelectrolytes and field-flow fractionation methods. They also greatly expand coverage of spectroscopy, including UV visible, Raman, infrared, NMR and mass spectroscopy. In addition, the Flory–Huggins theory for polymer solutions and their phase separation is treated more rigorously. Part III A completely new, major topic in this section is multicomponent polymer systems. The book also incorporates new material on macromolecular dynamics and reptation, liquid crystalline polymers and thermal analysis. Many of the diagrams and micrographs have been updated to more clearly highlight features of polymer morphology. Part IV The last part of the book contains major new sections on polymer composites, such as nanocomposites, and electrical properties of polymers. Other new topics include effects of chain entanglements, swelling of elastomers, polymer fibres, impact behaviour and ductile fracture. Coverage of rubber-toughening of brittle plastics has also been revised and expanded. While this edition adds many new concepts, the philosophy of the book remains unchanged. Largely self-contained, the text fully derives most equations and cross-references topics between chapters where appropriate. Each chapter not only includes a list of further reading to help readers expand their knowledge of the subject but also provides problem sets to test understanding, particularly of numerical aspects.

Nanostructured Polymer Blends and Composites in Textiles

Author : Mihai Ciocoiu
File Size : 20.90 MB
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This new volume reviews recent academic and technological developments behind new engineered modified nanotextile materials. The developments in textiles using nanotechnology give ordinary materials improved properties, such as better water resistance, enhanced moisture and odor reduction, increased strength and elasticity, and resistance to bacteria, among other improvements. The research reported in this book presents state-of-the-art technology in modern materials with an emphasis on the rapidly growing technologies in textile engineering. Several innovative applications for different materials are described in considerable detail with emphasis on the experimental data that supports these new applications. From nano-fibers to chemical materials, creative modifications concerning new nanocomposites are described that could one day become commonplace. The book covers a host of topics in this area, including the design of new textile products, moisture and heat transfer in clothing, developments in electrospinning, new applications, nanotextile and tissue engineering from a biological perspective, and more. The book is intended for researchers and those interested in future developments in mechanical and physicochemical characteristics of modified nanotextile materials and polymer blends. The book will also be a useful tool for students and researchers, providing helpful insights into new evolving research areas in nanostructured polymer blends and composites in textiles.