Download or read book Polymer Networks Containing Reversibly Associating Side groups written by Jiahui Li and published by . This book was released on 2011 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Supramolecular polymers consist of low molar mass subunits that non-covalently bind together through hydrogen bonding or other non-covalent interactions, forming macromolecular assemblies. Site-specific and reversible hydrogen bonds and other non-covalent interactions are increasingly employed to modify bulk polymer properties, enabling thermoplastic elastomers and self-healing polymers. In this thesis, I investigate how hydrogen bonding groups directly bonded onto an elastic polymer network affect material properties. A lightly crosslinked covalent network containing hydrogen bonding side-groups (ureidopyrimidinone, UPy) was synthesized. This architecture results in a novel shape-memory effect, and the molecular events resulting in this behavior were deduced. Further, to systematically evaluate how thermomechanical properties are related to network architecture, a new photo-crosslinking route was developed to prepare shape-memory elastomers. This method enables melt-processing of shape-memory elastomers into complex permanent shapes, and samples can be prepared with much higher UPy-content. Furthermore, the covalent and non-covalent crosslink density can be accurately controlled. Dynamic mechanical analysis on photo-crosslinked shape-memory elastomers revealed that dynamic crosslinks behave nearly as effectively as permanent crosslinks below the UPy hydrogen bond transition. Compared to linear polymers bearing identical hydrogen bonding groups, the synthesized dynamic networks exhibit an enhanced temperature dependence of mechanical properties. This indicates that the covalent network supports cooperative hydrogen bonding. This finding will guide researchers to more effectively employ non-covalent interactions within bulk polymer materials. Mass transport through dynamic networks was also studied using multi-photon fluorescence recovery after photobleaching (MP-FRAP). In contrast to viscous relaxation, small molecule mass transport through the dynamic networks is limited by the density of hydrogen bonds instead of their exchange rate"--Leaves vii-viii.

Download or read book Supramolecular Polymer Networks and Gels written by Sebastian Seiffert and published by Springer. This book was released on 2015-04-06 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series Advances in Polymer Science presents critical reviews of the present and future trends in polymer and biopolymer science. It covers all areas of research in polymer and biopolymer science including chemistry, physical chemistry, physics, material science. The thematic volumes are addressed to scientists, whether at universities or in industry, who wish to keep abreast of the important advances in the covered topics. Advances in Polymer Science enjoys a longstanding tradition and good reputation in its community. Each volume is dedicated to a current topic and each review critically surveys one aspect of that topic, to place it within the context of the volume. The volumes typically summarize the significant developments of the last 5 to 10 years and discuss them critically, presenting selected examples, explaining and illustrating the important principles and bringing together many important references of primary literature. On that basis, future research directions in the area can be discussed. Advances in Polymer Science volumes thus are important references for every polymer scientist, as well as for other scientists interested in polymer science - as an introduction to a neighboring field, or as a compilation of detailed information for the specialist. Review articles for the individual volumes are invited by the volume editors. Single contributions can be specially commissioned. Readership: Polymer scientists, or scientists in related fields interested in polymer and biopolymer science, at universities or in industry, graduate students.

Download or read book Adaptive And Functional Polymers Textiles And Their Applications written by Jinlian Hu and published by World Scientific. This book was released on 2011-02-10 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive polymers include those which are responsive to different stimuli — namely physical, mechanical, chemical and biological — with controlled and/or predicable behavior. Many technological breakthroughs and scientific advances have been made in the last few decades and this volume aims to cover the most up-to-date studies and achievements in some adaptive polymers, in terms of principles of adaptiveness, properties, structure design and characterization with an emphasis on their applications, particularly in textiles, skin care, medicine and other related areas. Some versatile functional polymers, such as Chitosan, cylodextrin and dendrimer,and hyper-branched polymers are also introduced in order to provide a source for people in different professions when searching for knowledge and inspiration in the field of adaptive and functional polymers. One of the key features of this book is the fact that it is multi-disciplinary in nature, and so accessible to a wide variety of readers.

Download or read book Supramolecular Assemblies Based on Electrostatic Interactions written by M. Ali Aboudzadeh and published by Springer Nature. This book was released on 2022-05-21 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents recent advances and current knowledge in the field of supramolecular assemblies based on electrostatic interactions. The flexibility and simplicity of constructing assemblies is explained via several examples, illustrations, figures, case studies, and historical perspectives. Moreover, as there is an increasing demand for the use of theoretical and computational models of the interaction strengths for assisting with the experimental studies, one chapter specifically focuses on the "modelling'' of supramolecular assemblies. Finally, various aspects of the recent advances of the field as well as potential future opportunities are discussed, with the goal being to stimulate critical discussions among the community and to encourage further discovery. This volume aims to inspire and guide fellow scientists and students working in this field and thus it provides a great tool for all researchers, graduates and professionals specializing on the topic.

Download or read book Shape Memory Polymers written by Jinlian Hu and published by Smithers Rapra. This book was released on 2014-05-27 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shape-memory polymers (SMP) are a unique branch of the smart materials family which are capable of changing shape on-demand upon exposure to external stimulus. The discovery of SMP made a significant breakthrough in the developments of novel smart materials for a variety of engineering applications, superseded the traditional materials, and also influenced the current methods of product designing. This book provides the latest advanced information of on-going research domains of SMP. This will certainly enlighten the reader to the achievements and tremendous potentials of SMP. The basic fundamentals of SMP, including shape-memory mechanisms and mechanics are described. This will aid reader to become more familiar with SMP and the basic concepts, thus guiding them in undergoing independent research in the SMP field. The book also provides the reader with associated challenges and existing application problems of SMP. This could assist the reader to focus more on these issues and further exploit their knowledge to look for innovative solutions. Future outlooks of SMP research are discussed as well. This book should prove to be extremely useful for academics, R&D managers, researcher scientists, engineers, and all others related to the SMP research.

Download or read book Advances in Shape Memory Polymers written by Jinlian Hu and published by Elsevier. This book was released on 2013-04-16 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shape memory materials are immensely useful because of their capability to recover their original shapes upon exposure to an external stimulus such as heat, moisture, light or a magnetic field. This book reviews key recent research in shape memory polymers, their properties and applications. Topics include the relationship between morphological structures and shape memory properties; high performance Tg and Tm type shape memory polymers; structures of shape memory polymers with supramolecular switches; and the thermally-active and moisture-active shape memory effect of supermolecular shape memory polymers. Advances in shape memory polymers is an essential reference for polymer and textile material students, scientists, designers, engineers and manufacturers. It is also an invaluable guide for professionals in the biomedical, electronics and engineering industries. Reviews key recent research in shape-memory polymers, their properties and applications Opening chapters address the relationship between morphological structures and shape memory properties and high performance Tg and Tm type shape memory polymers Chapters cover thermally-active and moisture-active shape memory effect of supermolecular shape memory polymers, among other topics

Download or read book Structure Property Relationships for Polymers Bearing Reversibly Associating Side groups written by Christopher Lloyd Lewis and published by . This book was released on 2014 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The objective of this research is to establish structure-property relationships for macromolecules bearing reversibly associating side-groups. In previous studies we demonstrated shape-memory behavior for elastomer networks bearing strong ureido-pyrimidinone (UPy) hydrogen-bonding side-groups. However, relationships between the underlying viscoelastic behavior and side-group features such as hydrogen bond strength, structure, the presence of a permanent network and distance of the binding group from the macromolecular chain are not well established. Further, while numerous studies focus on the associative behavior of polymers in solution, few have examined their bulk behavior. To address this need, copolymers bearing weak ([Delta]H ~ 30kJ/mol) or strong hydrogen ([Delta]H ~ 70kJ/mol) bonding side-groups (HBSGs) were copolymerized with a low glass transition (Tg) polymer backbone into linear and network polymers. For polymers bearing weak HBSGs the temperature dependence of viscosity could be attributed to the elevation of Tg alone whereas the rheological behavior of strong HBSG polymers could be attributed to side-group association. To explain our results, a 'state-of-ease' model was developed that assumes continuous mechanical equilibrium between applied stress and the stresses arising from a permanent network and a second network that continuously reforms. The model is able to predict various rheological responses for UPy containing polymers such as dynamic mechanical and shape-memory behavior. The influence of micro-environment can also influence viscoelastic behavior. To assess the ability of a strong HBSG to dimerize within water swollen environments the swelling and dynamic mechanical behavior of a hydrophilic polymer bearing UPy side-groups was studied. The presence of UPy reduced the rate of short-time swelling whereas long-time swelling increased with UPy concentration and was attributed to UPy disrupting the native polymer structure. While the presence of UPy dramatically increased the viscosity, it does not form a percolated network at low UPy concentrations, suggesting that UPy's efficacy is reduced in the presence of water. In summary, by systematically studying several model polymers, this thesis exposes the degree to which reversibly binding side-groups can affect rheology, solid mechanics, and water sorption. The acquired knowledge can form a basis for materials design of future self-healing and shape-memory polymers, thermoplastic elastomers, and other field-responsive polymers"--Pages viii-ix.

Download or read book Advanced Elastomers written by Anna Boczkowska and published by BoD – Books on Demand. This book was released on 2012-09-12 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an extensive overview of current trends in the area of elastomers and their composites from the chapters contributed by internationally recognized specialists. The book deals with novel synthesis, modelling and experimental methods in elastomers. Contents include: new approach to crosslinking, liquid crystal elastomers, nanocomposites, smart elastomers, elastomers in microelectronics and microfluidics, elastomers in cement concrete and mortar, experimental testing and modelling. Each section demonstrates how enhancements in materials, processes and characterization techniques can improve performance in the field of engineering. The book provides a unique opportunity to discover the latest research on elastomer advances from laboratories around the world. This book addresses to industrial and academic researchers in the fields of physical, chemical, biological sciences and engineering.

Download or read book Multifunctional Polymeric Nanocomposites Based on Cellulosic Reinforcements written by Debora Puglia and published by William Andrew. This book was released on 2016-07-11 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multifunctional Polymeric Nanocomposites Based on Cellulosic Reinforcements introduces the innovative applications of polymeric materials based on nanocellulose, and covers extraction methods, functionalization approaches, and assembly methods to enable these applications. The book presents the state-of-the-art of this novel nano-filler and how it enables new applications in many different sectors, beyond existing products. With a focus on application of nano-cellulose based polymers with multifunctional activity, the book explains the methodology of nano-cellulose extraction and production and shows the potential performance benefits of these particular nanostructured polymers, for applications across different sectors, including food active packaging, energy-photovoltaics, biomedical, and filtration. The book describes how the different methodologies, functionalization, and organization at the nano-scale level could contribute to the design of required properties at macro level. The book studies the interactions between the main nano-filler with other active systems and how this interaction enables multi-functionality in the produced materials. The book is an indispensable resource for the growing number of scientists and engineers interested in the preparation and novel applications of nano-cellulose, and for industrial scientists active in formulation and fabrication of polymer products based on renewable resources. Provides insight into nanostructure formation science, and processing of polymeric materials and their characterization Offers a strong analysis of real industry needs for designing the materials Provides a well-balanced structure, including a light introduction of basic knowledge on extraction methods, functionalization approaches, and assembling focused to applications Describes how different methodologies, functionalization, and organization at the nano-scale level could contribute to the design of required properties at macro level

Download or read book Stimuli Responsive Polymer Systems Recent Manufacturing Techniques and Applications written by Akif Kaynak and published by MDPI. This book was released on 2019-09-17 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stimuli-responsive polymer systems can be defined as functional materials that show physical or chemical property changes in response to external stimuli such as temperature, radiation, chemical agents, pH, mechanical stress, and electric and magnetic fields. Recent developments in manufacturing techniques have facilitated the production of a wide range of stimuli-responsive polymer systems, such as micro- and nanoscale structures, with potential applications in soft sensors and actuators, smart textiles, soft robots, and artificial muscles. This book brings together the recent progress in manufacturing techniques, with particular emphasis on 3D and 4D printing and applications of stimuli-responsive polymer systems in biomedicine and soft robotics.

Download or read book Shape Memory Polymers Blends and Composites written by Jyotishkumar Parameswaranpillai and published by Springer. This book was released on 2019-07-01 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the recent advances in the field of shape memory polymers, whose ease of manufacturing and wide range of potential applications have spurred interest in the field. The book presents details about the synthesis, processing, characterization, and applications of shape memory polymers, their blends and composites. It provides a correlation of physical properties of shape memory polymers with macro, micro and nano structures. The contents of this book will be of interest to researchers across academia and industry.

Download or read book Smart Biomaterials written by Mitsuhiro Ebara and published by Springer. This book was released on 2014-05-28 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides comprehensive coverage of smart biomaterials and their potential applications, a field that is developing at a very rapid pace. Because smart biomaterials are an emerging class of biomaterials that respond to small changes in external stimuli with large discontinuous changes in their physical properties, they have been designed to act as an “on–off” switch for, among others, bio separation, immunoanalysis, drug delivery technologies, gene therapy, diagnostics, bio sensors and artificial muscles. After an introduction to the topic and the history of smart biomaterials, the author gives the reader an in-depth look at the properties, mechanics, and characterization of smart biomaterials including hydrogels, particles, assemblies, surfaces, fibers and conjugates. Information on the wide range of applications for these materials follows, including drug delivery, tissue engineering, diagnostics, biosensors, bio separation and actuators. In addition, recent advances in shape memory biomaterials as active components of medical devices are also presented.

Download or read book Dynamics and Mechanics of Associating Polymer Networks written by Shengchang Tang (Ph. D.) and published by . This book was released on 2016 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Associating polymers have attracted much interest in a variety of applications such as selfhealing materials, biomaterials, rheological modifiers, and actuators. The interplay of polymer topology and sticker chemistry presents significant challenges in understanding the physics of associating polymers across a wide range of time and length scales. This thesis aims to provide new insights into the structure-dynamics-mechanics relationships of associating polymer networks. This thesis first examines diffusion of various types of associating polymers in the gel state through a combination of experiment and theory. By using forced Rayleigh scattering (FRS), phenomenological super-diffusion is revealed as a general feature in associating networks. Experimental findings are quantitatively explained by a simple two-state model that accounts for the interplay of chain diffusion and the dynamic association-dissociation equilibrium of polymer chains with surrounding network. Furthermore, hindered self-diffusion is shown to directly correlate with a deviation from the Maxwellian behavior in materials rheological response on the long time scale. To further understand how sticker dynamics affects the network mechanical properties, a new method referred to as "sticker diffusion and dissociation spectrometry" is developed to quantify the dissociation rate of stickers in the network junctions. It is demonstrated that sticker dissociation is a prerequisite step for sticker exchange that leads to macroscopic stress relaxation. Finally, this thesis explores the use of fluorescence recovery after photobleaching (FRAP) to measure self-diffusion of associating polymers, and a mathematical framework is established. The second part of this thesis focuses on the development of new methods of controlling the mechanical properties of associating networks through engineering the molecular structure of polymer chains. Specifically, topological entanglement is introduced into the network through extending the polymer chains to reach beyond their entanglement threshold. This strategy drastically enhances material's toughness, extensibility, creep resistance and stability in solutions. Various types of coupling chemistries are then explored to fine tune the extent of entanglement. The entanglement effect and the long-time relaxation of materials can be further controlled by introducing branching points into the macromolecules.

Download or read book Biomedical Materials written by Roger Narayan and published by Springer Nature. This book was released on 2020-12-09 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition provides a comprehensive discussion of contemporary materials used in biomedical research and development. The pedagogical writing style and structure provides students with an understanding of the fundamental concepts necessary to pursue research and industrial work in this growing area of biomedical science, including characteristics of biomaterials, biological processes, biocompatibility, and applications of materials in implants and medical instruments. Written by leading researchers in the field, this volume highlights important topics associated with biomedical engineering, medicine and surgery. The revised text contains updates that reflect recent technological advances in biomedical materials. It contains information on new characterization methods and applications for biomedical materials and incorporates suggestions that were offered by readers and educators using the first edition over the years. This textbook takes the reader to the forefront of biomedical materials development, providing graduate students with a taste of how the field is changing, while also serving as a useful reference to physicians and engineers.

Download or read book Photomechanical Materials Composites and Systems written by Timothy J. White and published by John Wiley & Sons. This book was released on 2017-05-30 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: An exhaustive review of the history, current state, and future opportunities for harnessing light to accomplish useful work in materials, this book describes the chemistry, physics, and mechanics of light-controlled systems. • Describes photomechanical materials and mechanisms, along with key applications • Exceptional collection of leading authors, internationally recognized for their work in this growing area • Covers the full scope of photomechanical materials: polymers, crystals, ceramics, and nanocomposites • Deals with an interdisciplinary coupling of mechanics, materials, chemistry, and physics • Emphasizes application opportunities in creating adaptive surface features, shape memory devices, and actuators; while assessing future prospects for utility in optics and photonics and soft robotics

Download or read book Self Healing Smart Materials written by Inamuddin and published by John Wiley & Sons. This book was released on 2021-05-13 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive book describes the design, synthesis, mechanisms, characterization, fundamental properties, functions and development of self-healing smart materials and their composites with their allied applications. It covers cementitious concrete composites, bleeding composites, elastomers, tires, membranes, and composites in energy storage, coatings, shape-memory, aerospace and robotic applications. The 21 chapters are written by researchers from a variety of disciplines and backgrounds.

Download or read book Aerospace Polymeric Materials written by Inamuddin and published by John Wiley & Sons. This book was released on 2022-08-30 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses polymeric and composite materials for aerospace industries and discusses some general qualities of aviation materials, e.g., strength, density, malleability, ductility, elasticity, toughness, brittleness, fusibility, conductivity, and thermal expansion. Metals and alloys have so far been best able to utilize their qualities almost to the maximum. The latest advancements in polymers and composites have opened up a new area of conjecture about how to modify airplanes and shuttles to be more polymeric and less metallic. Polymeric materials have been the focus of exploration due to their high strength-to-weight ratio, low cost, and a greater degree of freedom in strengthening the needed qualities. Strength, density, malleability, ductility, elasticity, toughness, brittleness, fusibility, conductivity, and thermal expansion are some of the general qualities of aviation materials that are taken into account. Aerospace Polymeric Materials discusses a wide range of methods with an outline of polymeric and composite materials for aerospace applications. Among the range of topics discussed are aerogel properties; polymeric welding; polymeric reinforcement, their properties, and manufacturing; conducting polymer composites; electroactive polymeric composites; and polymer nanocomposite dielectrics. In addition, a summary of self-healing materials is also presented, including their significance, manufacturing methods, properties, and applications. Audience This is a useful guide for engineers, materials scientists, researchers, and postgraduate students from industry, academia, and laboratories that are linked to polymeric composites.