Influence of Copolymer Composition and Chain Architecture on the Wood Fiber/polymer Interface
Author: Marja-Leena Kosonen
Publisher:
Published: 2001
Total Pages: 344
ISBN-13:
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Influence of Composition, Chain Architecture and Processing on Polymer Structure and Properties
Author:
Publisher:
Published: 1997
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKThis project concerned the fundamental understanding of processing-structure and structure-property relations in block copolymer and liquid crystalline polymer systems. Key to our studies was the availability of model materials which afforded opportunities via new chemical compositions and physical properties. Transmission electron microscopy, low voltage high resolution scanning electron microscopy, light microscopy and atomic force microscopy as well as wide and small angle x-ray scattering were the principal characterization tools. We also employed a special roll cast process to form highly textured samples for investigation of their physical properties. Principal research accomplishments are grouped into 6 areas: influence of architecture on phase behavior; development of experimental techniques; microphase separation in block copolymers; large strain deformation of single crystal thermoplastic elastomers; morphology and dynamic interaction of defects in polymer liquid crystals; and technology transitions.
The Effect of Composition and Architecture on Polymer Behavior in Homopolymer Blends and Inter-filament Bonding in 3D Printed Models
Author: Edward Roy Duranty
Publisher:
Published: 2015
Total Pages: 168
ISBN-13:
DOWNLOAD EBOOKThis dissertation presents work that increases our understanding of the effects of composition and architecture on copolymer structure and dynamics and how they affect material diffusion between filaments in a 3D printed model. Copolymers are polymer chains made up of at least two different monomers. The ordering and arrangement of the two monomer species within a copolymer can have drastic effects on the behavior and properties of the copolymer. The first chapter of this dissertation examines how the copolymer composition affects the structure and dynamics of the chain in a homopolymer blend. This study used a modified Monte Carlo BFM to simulate random polystyrene(PS)-polymethymethacrylate(PMMA) copolymers in a PMMA matrix. The results suggest that the faster moving PS segments in the copolymer chain dominate the chain's motion. However, concentration fluctuations in the local volume around segments of the chain ultimately slow the chain down. This work sheds light into why a randomly distributed copolymer will move faster than a di-block copolymer of the same monomer composition. The next project focused on the effect of copolymer architecture on the structure and dynamics of branched polymers in a homopolymer matrix using a Monte Carlo simulation. In these simulations, branched polymer consisted of a backbone and the side-chains being unlike monomer species. The number and the molecular weight of the branches was varied to study the effects of branch packing densities on homopolymer copolymer comb structure and motion. Additionally, the temperature varied to determine the effect of available thermal energy on each architectural copolymer configuration. The results of this project concluded that the structure and motion of a branched polymer are a result of the balance in the thermodynamic environment surrounding the copolymer. Finally, the effect of inter-filament heat and copolymer diffusion on inter-filament bonding in 3D printed part was examined. In this study the importance of thermal history in the print environment was determined quantitatively and its effect on the adhesion between acrylonitrile-butadiene-styrene (ABS) copolymer filaments was probed. Additionally, the interface between ABS filaments was improved using a chemical cross-linker. These studies provide insight into improving the mechanical strength of 3D printed parts.
Wood-Polymer Composites
Author: K O Niska
Publisher: Elsevier
Published: 2008-05-29
Total Pages: 383
ISBN-13: 1845694570
DOWNLOAD EBOOKWood-polymer composites (WPC) are materials in which wood is impregnated with monomers that are then polymerised in the wood to tailor the material for special applications. The resulting properties of these materials, from lightness and enhanced mechanical properties to greater sustainability, has meant a growing number of applications in such areas as building, construction and automotive engineering. This important book reviews the manufacture of wood-polymer composites, how their properties can be assessed and improved and their range of uses.After an introductory chapter, the book reviews key aspects of manufacture, including raw materials, manufacturing technologies and interactions between wood and synthetic polymers. Building on this foundation, the following group of chapters discusses mechanical and other properties such as durability, creep behaviour and processing performance. The book concludes by looking at orientated wood-polymer composites, wood-polymer composite foams, at ways of assessing performance and at the range of current and future applications.With its distinguished editors and international team of contributors, Wood-polymer composites is a valuable reference for all those using and studying these important materials. Provides a comprehensive survey of major new developments in wood-polymer composites Reviews the key aspects of manufacture, including raw materials and manufacturing technologies Discusses properties such as durability, creep behaviour and processing performance
Self-Healing Polymers
Author: Wolfgang H. Binder
Publisher: John Wiley & Sons
Published: 2013-03-29
Total Pages: 638
ISBN-13: 3527670203
DOWNLOAD EBOOKSelf-healing is a well-known phenomenon in nature: a broken bone merges after some time and if skin is damaged, the wound will stop bleeding and heals again. This concept can be mimicked in order to create polymeric materials with the ability to regenerate after they have suffered degradation or wear. Already realized applications are used in aerospace engineering, and current research in this fascinating field shows how different self-healing mechanisms proven successful by nature can be adapted to produce even more versatile materials. The book combines the knowledge of an international panel of experts in the field and provides the reader with chemical and physical concepts for self-healing polymers, including aspects of biomimetic processes of healing in nature. It shows how to design self-healing polymers and explains the dynamics in these systems. Different self-healing concepts such as encapsulated systems and supramolecular systems are detailed. Chapters on analysis and friction detection in self-healing polymers and on applications round off the book.
Engineered Materials Abstracts
Author:
Publisher:
Published: 1992-07
Total Pages: 942
ISBN-13:
DOWNLOAD EBOOKPolymer Science and Engineering
Author: National Research Council
Publisher: National Academies Press
Published: 1994-01-01
Total Pages: 193
ISBN-13: 0309049989
DOWNLOAD EBOOKPolymers are used in everything from nylon stockings to commercial aircraft to artificial heart valves, and they have a key role in addressing international competitiveness and other national issues. Polymer Science and Engineering explores the universe of polymers, describing their properties and wide-ranging potential, and presents the state of the science, with a hard look at downward trends in research support. Leading experts offer findings, recommendations, and research directions. Lively vignettes provide snapshots of polymers in everyday applications. The volume includes an overview of the use of polymers in such fields as medicine and biotechnology, information and communication, housing and construction, energy and transportation, national defense, and environmental protection. The committee looks at the various classes of polymersâ€"plastics, fibers, composites, and other materials, as well as polymers used as membranes and coatingsâ€"and how their composition and specific methods of processing result in unparalleled usefulness. The reader can also learn the science behind the technology, including efforts to model polymer synthesis after nature's methods, and breakthroughs in characterizing polymer properties needed for twenty-first-century applications. This informative volume will be important to chemists, engineers, materials scientists, researchers, industrialists, and policymakers interested in the role of polymers, as well as to science and engineering educators and students.
Smart Polymers and Composites
Author: Abu Nasar
Publisher: Materials Research Forum LLC
Published: 2018-01-02
Total Pages: 207
ISBN-13: 1945291478
DOWNLOAD EBOOKPolymeric compounds are generally blended with inorganic/organic materials to prepare composites to tailor the desired properties for specific requirements. The present book reviews new research in the fields of composite green polymers for environmental applications, polyaniline based composites for wastewater treatment, smart polymeric coating materials, polymer decorated bimetallic nanosorbents for dye removal, fuel cell materials, polymeric membranes, green bio-nanocomposites and polymer based catalysts. Composite Green Polymers, Polyaniline Based Composites, Smart Polymeric Materials, Nanosorbents, Polymeric Membranes, Bio-Nanocomposites, Polymer Based Catalyst, Wastewater Treatment, Dye Removal, Fuel Cell Materials, Dehydrogenation
Polymer Chemistry
Author: Timothy P. Lodge
Publisher: CRC Press
Published: 2020-07-14
Total Pages: 609
ISBN-13: 1466581662
DOWNLOAD EBOOKA well-rounded and articulate examination of polymer properties at the molecular level, Polymer Chemistry focuses on fundamental principles based on underlying chemical structures, polymer synthesis, characterization, and properties. It emphasizes the logical progression of concepts and provide mathematical tools as needed as well as fully derived problems for advanced calculations. The much-anticipated Third Edition expands and reorganizes material to better develop polymer chemistry concepts and update the remaining chapters. New examples and problems are also featured throughout. This revised edition: Integrates concepts from physics, biology, materials science, chemical engineering, and statistics as needed. Contains mathematical tools and step-by-step derivations for example problems Incorporates new theories and experiments using the latest tools and instrumentation and topics that appear prominently in current polymer science journals. The number of homework problems has been greatly increased, to over 350 in all. The worked examples and figures have been augmented. More examples of relevant synthetic chemistry have been introduced into Chapter 2 ("Step-Growth Polymers"). More details about atom-transfer radical polymerization and reversible addition/fragmentation chain-transfer polymerization have been added to Chapter 4 ("Controlled Polymerization"). Chapter 7 (renamed "Thermodynamics of Polymer Mixtures") now features a separate section on thermodynamics of polymer blends. Chapter 8 (still called "Light Scattering by Polymer Solutions") has been supplemented with an extensive introduction to small-angle neutron scattering. Polymer Chemistry, Third Edition offers a logical presentation of topics that can be scaled to meet the needs of introductory as well as more advanced courses in chemistry, materials science, polymer science, and chemical engineering.
