Structure-property Relationships in Thiol-based Polymer Networks PDF Download
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Author: Michael Taylor
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Michael Taylor
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Charles E. Carraher Jr.
Publisher: Springer Science & Business Media
ISBN: 1468447483
Category : Science
Languages : en
Pages : 234
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Book Description
The first concern of scientists who are interested in synthetic polymers has always been, and still is: How are they synthesized? But right after this comes the question: What have I made, and for what is it good? This leads to the important topic of the structure-property relations to which this book is devoted. Polymers are very large and very complicated systems; their character ization has to begin with the chemical composition, configuration, and con formation of the individual molecule. The first chapter is devoted to this broad objective. The immediate physical consequences, discussed in the second chapter, form the basis for the physical nature of polymers: the supermolecular interactions and arrangements of the individual macromolecules. The third chapter deals with the important question: How are these chemical and physical structures experimentally determined? The existing methods for polymer characterization are enumerated and discussed in this chapter. The following chapters go into more detail. For most applications-textiles, films, molded or extruded objects of all kinds-the mechanical and the thermal behaviors of polymers are of pre ponderant importance, followed by optical and electric properties. Chapters 4 through 9 describe how such properties are rooted in and dependent on the chemical structure. More-detailed considerations are given to certain particularly important and critical properties such as the solubility and permeability of polymeric systems. Macromolecules are not always the final goal of the chemist-they may act as intermediates, reactants, or catalysts. This topic is presented in Chapters 10 and 11.
Author: Christopher Brittain Cooper
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Many emerging applications including wearable electronics and e-skins, soft robotics and actuators, and biomaterials, require material platforms with precisely controlled mechanical, electrical, thermal, and optical properties. The practical realization of devices for these applications is often restricted not by the lack of novel designs, but rather by the sparsity of materials with the required properties. Dynamic polymers, which employ both permanent and reversible linkages, offer a promising platform for the design of new materials due to their highly tunable and responsive chemical structures. This dissertation explores structure-property relationships in different dynamic polymer networks with well-defined polymer design and is structured as follows. Chapter 1 introduces the concept of dynamic polymers, provides comparisons to supramolecular polymers and segmented block copolymers, and concludes with emerging applications for these systems. Chapter 2 examines the molecular design rules for spontaneous self-assembly of periodic dynamic polymers into supramolecular nanofibers. Chapter 3 discusses the phenomenon of strain-induced supramolecular structures exhibited by entangled periodic dynamic polymers. Chapter 4 highlights how the clustered nanomorphology exhibited by periodic dynamic polymers can be used to design recyclable underwater adhesives. Chapter 5 explains how immiscible dynamic polymers can be used to achieve autonomous alignment of multilayered soft electronics. Chapter 6 concludes with key observations and on the future outlook of next-generation materials.
Author: Dongkyu Park
Publisher:
ISBN:
Category : Copolymers
Languages : en
Pages : 308
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Book Description
Author: Andrew B. Lowe
Publisher: Royal Society of Chemistry
ISBN: 184973660X
Category : Science
Languages : en
Pages : 337
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Book Description
A comprehensive resource on thiol-x chemistries for postgraduates, academics and industrial practitioners interested in polymer and materials applications from leading experts in the field.
Author: R.F. Stepto
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 368
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Book Description
Written by an international team of authors with a strong emphasis on the underlying chemistry, this book forms a timely, concise, and accessible evaluation of the fundamentals of polymer network formation, structure, and properties, and how these three aspects are interrelated.
Author: Samy Madbouly
Publisher: Elsevier
ISBN: 0443190208
Category : Technology & Engineering
Languages : en
Pages : 372
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Book Description
High Performance Plant Phenol-Based Polymers brings together the latest advances in phenol-based polymers, composites, and nanocomposites, covering synthesis, preparation, characterization, processing, and applications. Bio-renewable plant phenols represent a diverse class of chemicals with great industrial significance due to their unique structures and high abundance. The depolymerization process of lignin into small bio-based phenols is a relatively new approach and has received considerable attention recently. This process produces key intermediates, phenolic compounds that can be used to develop and design a wide range of high-performance, bio-renewable, and multifunctional polymers and composites. This book will provide materials scientists and engineers with a useful framework to help take advantage of the latest research conducted in this rapidly advancing field, enabling them to develop and commercialize their own products quickly and more successfully. The book will be of practical interest to academic researchers, industrial scientists, engineers, and advanced students in the area of materials science and engineering, particularly those with an interest in high-performance bio-based polymers and composites. Reviews the current state-of-the-art in phenol-based polymers, composites, and nanocomposites Guides the reader through the preparation of a range of advanced polymers based on plant phenols Provides a critical review of current applications in various fields, such biomedicine and automotive
Author: A. Chompff
Publisher: Springer Science & Business Media
ISBN: 1475762100
Category : Technology & Engineering
Languages : en
Pages : 494
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Book Description
For several decades, polymer science has sought to rationalize the mechanical and thermodynamic properties of polymer networks largely within the framework of statistical thermodynamics. Much of this effort has been directed toward the rubbery rather than the glassy state. It is generally assumed that networks possess an av erage composition to which average properties may be assigned; from such a continuum view, a powerful analysis of such properties as modulus, swelling, birefringence and thermoelasticity has emerged. In the years following the rise of polymer characterization (the late 40's and early 50's), many scientists began to study ap parent relations between the properties of linear polymer molecules and the networks obtainable therefrom. This search was also stimu lated by the wide range of applications of polymer networks in com mercial elastomers, thermosets and coatings. Frequently, these data were confidently matched with curves obtained from statisti cally describable models of networks of ghost chains, uniformly distributed in space. More recently, it has become apparent that polymer chains in networks are not as ideal as assumed in the formulation of statis tical models, and there has been a shift in emphasis towards the less than ideal, perturbed and possibly inhomogeneous networks which are more frequently encountered in practice. The continuum approach, however, had to be developed before inhomogeneous systems could be described; the present volume, therefore, contains both views.
Author: Yuan Hu
Publisher: Elsevier
ISBN: 0323907725
Category : Technology & Engineering
Languages : en
Pages : 494
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Book Description
Bio-Based Flame Retardants for Polymeric Materials provides a comprehensive overview of flame retardants derived directly and indirectly from plant sources, drawing on cutting-edge research and covering preparation methods, testing and evaluation techniques, enhanced properties, and end applications. Chapters introduce bio-based materials in the context of additives for flame retardancy, explaining fundamentals and testing methods and analyzing synthetic approaches and the potential advantages of pursuing a bio-based approach. This is followed by detailed coverage of bio-based retardants, with each chapter covering a specific source and guiding the reader systematically through preparation techniques, evaluation methods, properties and applications. Throughout the book, the latest progress in the field is critically reviewed, and there is a continual emphasis on novel approaches to achieve enhanced properties and performant materials. This is an essential guide for all those with an interest in innovative, sustainable flame retardant additives for polymeric materials, including researchers, scientists, advanced students, and more. Explains innovative techniques for the preparation of bio-based flame retardant mechanisms, analyzing properties, performance and applications Offers in-depth coverage of a range of sources, including cellulose, lignin, cardanol, chitosan, eugenol, vanillin, furan, alginate and vegetable oils Presents the latest advances in the field, serving as a novel resource to advanced students, researchers and R&D professionals in academia and industry
Author: Michelle Kay Sing
Publisher:
ISBN:
Category :
Languages : en
Pages : 354
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Book Description
Associating polymer networks are included in a large number of materials where it is important to control and tune the rheological response of the material, particularly including responses to temperature, shear, or changes in the surrounding environment. Knowledge of the relationship between the kinetics of the end-groups that form these associations and the mechanical behavior of the network can provide valuable insight into the design of these sorts of materials. This thesis first looks at a simple theoretical approach for predicting the mechanical behavior of these transient networks as a function of the association kinetics. By using a modified form of the Smoluchowski equation to track the full probability distribution of looped, bridged, and dangling chain conformations in the network, it is possible to see relationships between the rate at which chains associate and dissociate and the presence of non-monotonic flow behaviors. Dangling chain tumbling due to the internal flux of the system under shear resulted in decreased stress through the ability to then form looped chains. The Smoluchowski equation can be adjusted to its Langevin form for Brownian Dynamics simulations of chain ends as a function of location and conformation. This modified formalism makes it so that it is not only striaghtforward to extract network relaxation times as a function of relative kinetics, but it is also possible to incorporate multiple bonds within a single association such that the association has a constant bond energy regardless of the number of bonds. The network relaxation can be grouped into two cases - one where a dissociated dangling chain is able to fully relax prior to association, and the other where the chain can only relax a fraction of the way prior to reassociation. These two cases result in different numbers of characteristic network relaxation times that change with increasing bond number. The second part of this thesis focuses on experimentally investigating how block and sequence architecture affect the deformation behavior and kinetics of thermoresponsive, dual-associating block copolymer systems. These systems are comprised of thermoresponsive elastin-like polypeptide endblocks (ELPs) fused to a polypeptide containing self-associating a-helical domains. Above the critical gel concentration, these protein fusions form disordered spherical nanostructures in solution. In shear flow, the rate of network deformation and rearrangement could be increased or decreased by changing block architecture, temperature, or concentration of the system. Protein fusions containing the standard ELP sequence underwent a liquid-like rearrangement of the nanostructure to accommodate the shear stresses associated with flow. Performing an amino acid substitution in the ELP endblock further affected the kinetics of rearrangement and resulted in multiple orders of magnitude increases in material toughness. This thesis has provided an increased understanding of how tailoring the properties of endblock associations can affect the mechanical behavior of the bulk material. Through increased understanding of how the properties of associating groups affect the macroscopic material properties, it is possible to better inform materials design for end-use applications.
