Download or read book Surface Modification with Polymer Brushes Via Light mediated Polymerizations written by Mingxiao Li and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer brushes, thin polymer coatings consisting of polymer chains that are tethered with one chain end to a surface, have drawn extensive interest in the field of surface modification. The chemical bonding between polymer and substrate allows unique properties such as chemical resistance and stimuli responsiveness. Over the past decade, numerous new chemistry platforms have been established to synthesize polymer brushes with a variety of conformations, such as diblock copolymer brushes and mixed polymer brushes. Although various applications have been demonstrated, efforts to allow industrial scale-up are still required. This dissertation focuses on developing new chemistry platforms to allow more facile and eco-friendly chemistry for polymer brush manufacturing. Surface-initiated photoinduced electron transfer -- reversible addition-fragmentation chain transfer polymerization (SI-PET-RAFT) was introduced as a novel light-mediated polymerization technique with high oxygen tolerance under a wide wavelength range of visible light. The modularity and versatility of SI-PET-RAFT was highlighted through significant flexibility with respect to the choice of monomer, light source, wavelength, and photoredox catalyst. The reproducibility of polymer brush synthesis is also interrogated. Experiments compared the stability of initiating monolayers for surface-initiated (SI) reversible addition-fragmentation chain transfer polymerization (SI-RAFT) and SI atom transfer radical polymerization (SI-ATRP). Initiator-functionalized substrates were stored under various conditions and grafting densities of the resulting polymer brush films were determined via in situ ellipsometry. Decomposition of one of the examined SI-RAFT initiators resulted in limited reproducibility for polymer brush surface modification. In contrast, initiators for SI-ATRP showed excellent stability and reproducibility. While both techniques bring inherent benefits and limitations, the described findings will help scientists choose the most efficient technique for their goals in chemical and topographical surface modification. Studies on developing synthetic platforms for mixed polymer brushes are also provided. Two different pathways, sequential SI-RAFT/SI-ATRP and sequential dual SI-PET-RAFT, were attempted due to their highly versatile monomer choices. Optimizations on each polymerization and selective chain end passivation were successfully performed. Although there still lacked direct evidence in the formation of mixed polymer brushes, the co-existence of two polymers was confirmed by X-ray photoelectron spectroscopy (XPS). Current challenges and corresponding future works are also discussed. Finally, resonance soft X-ray reflectivity (RSoXR) is introduced as a novel characterization technique to probe vertical distribution of polymer brushes. Reflectance data of homopolymer brushes, diblock copolymer brushes, spin-coated bilayer films at carbon K-edge were investigated. The depth profiles obtained via RSoXR were in agreement with results from variable angle spectroscopic ellipsometry (VASE). Both techniques revealed a rougher polymer-polymer interface in diblock copolymer brushes than in spin-coated bilayer films.
Download or read book Controlled and Living Polymerizations written by Krzysztof Matyjaszewski and published by John Wiley & Sons. This book was released on 2009-09-28 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by a highly prestigious and knowledgeable team of top scientists in the field, this book provides an overview of the current status of controlled/living polymerization, combining the synthetic, mechanistic and application-oriented aspects. From the contents: * Anionic Vinyl Polymerization * Carbocationic Polymerization * Radical Polymerization * Coordinative Polymerization of Olefins * Ring-Opening Polymerization of Heterocycles * Ring-Opening Metathesis Polymerization * Macromolecular Architectures * Complex Functional Macromolecules * Synthesis of Block and Graft Copolymers * Bulk and Solution Structures of Block Copolymers * Industrial Applications While some of the material is based on chapters taken from the four-volume work "Macromolecular Engineering", it is completely updated and rewritten to reflect the focus of this monograph. Must-have knowledge for polymer and organic chemists, plastics technologists, materials scientists and chemical engineers.
Download or read book Aqueous Lubrication Natural And Biomimetic Approaches written by Nicholas D Spencer and published by World Scientific. This book was released on 2014-03-24 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: Man lubricates mostly with oil. Nature lubricates exclusively with water. Pure water is a poor lubricant, but the addition of proteins, especially glycoproteins, can modify surfaces to make them far more lubricating at slow speeds. Understanding how nature does this, and the physical structures involved, is not only important for the understanding of diseases such as osteoarthritis, but also essential for the successful application of articulating implants, such as hips and knees, as well as the development of medical devices such as catheters and contact lenses. A host of important applications of water-based lubrication are already in place in the personal care and food industries, and further industrial applications of water-based lubrication could have a significant positive impact on the environment.This book is the first of its kind. It brings together the latest research in biological and biomimetic, water-based lubrication and is authored by the world's experts in the field.
Download or read book Oxygen Tolerant Photopolymerization for Advanced Functional Surfaces written by Michele Fromel and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymeric surface coatings are widely employed for diverse surface modification, with numerous applications in household goods such as non-stick frying pans, as well as in specialized materials such as membranes and opto-electronics. However, common physisorbed coatings lack the durability and stimuli-responsiveness that surface-tethered polymer brush films can offer. Using surface-initiated reversible-deactivation radical polymerization (SI-RDRP) techniques such as SI reversible addition-fragmentation chain transfer (SI-RAFT) polymerization and SI atom transfer radical polymerization (SI-ATRP), both uniform and intricately patterned surface-tethered polymer brush films can be produced. The present work focuses on the development of user- and eco-friendly SI-RDRP techniques in an effort to overcome many historical limitations on the large-scale use of SI-RDRPs: oxygen-sensitivity, limited monomer and substrate scope, costly, cumbersome patterning equipment, and the need for harsh organic solvents, thermal radical initiators, or UV-light initiation. The techniques developed herein are used to fabricate both uniform and intricately patterned, highly durable polymer brush films with functional surface properties. SI photoinduced electron transfer (PET)-RAFT is introduced as an SI-RDRP with oxygen tolerance, spatiotemporal control, monomer scope including a broad range of (meth)acrylate and (meth)acrylamide monomers, and visible light mediation. Synthetic reproducibility and long-term stability of surface initiators for both SI-RAFT and SI-ATRP are then interrogated under various storage conditions. Grafting densities of the resulting polymer brush films are determined and provide insight into storage requirements for substrates containing pre-deposited surface initiator species to ensure reproducibility of subsequent polymerizations. A photolithography approach incorporating an LED digital light projector is introduced as an inexpensive, push-of-a-button method for construction of spatially and chemically patterned polymer architectures using SI-PET-RAFT polymerization under ambient conditions. To further improve user- and eco-friendliness of polymerizations and provide access to a variety of additional monomers species, SI-PET-RAFT is then translated to aqueous solutions, allowing high ionic monomer solubility and polymerization under even lower-energy visible light. The cationic, anionic, and zwitterionic polymers accessible by this method show promise as long-lasting, functional materials with excellent anti-fogging activity. Finally, substrate scope is expanded beyond silicon-based substrates to organic materials, introducing the functionalization of polycarbonate (PC) with RAFT surface initiators. This allows modification of a popular consumer plastic using aqueous SI-PET-RAFT to produce hydrophilic polymer brushes and overcome the hydrophobicity of PC, which commonly limits its applications, particularly in biomedical applications. These new procedures and technologies place both uniform and patterned polymer brush coatings on the verge of industrialization, bringing advanced materials with long-lasting performance closer to the hands of consumers.
Download or read book Surface Modification of Polymers written by Jean Pinson and published by John Wiley & Sons. This book was released on 2020-02-18 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: A guide to modifying and functionalizing the surfaces of polymers Surface Modification of Polymers is an essential guide to the myriad methods that can be employed to modify and functionalize the surfaces of polymers. The functionalization of polymer surfaces is often required for applications in sensors, membranes, medicinal devices, and others. The contributors?noted experts on the topic?describe the polymer surface in detail and discuss the internal and external factors that influence surface properties. This comprehensive guide to the most important methods for the introduction of new functionalities is an authoritative resource for everyone working in the field. This book explores many applications, including the plasma polymerization technique, organic surface functionalization by initiated chemical vapor deposition, photoinduced functionalization on polymer surfaces, functionalization of polymers by hydrolysis, aminolysis, reduction, oxidation, surface modification of nanoparticles, and many more. Inside, readers will find information on various applications in the biomedical field, food science, and membrane science. This important book: -Offers a range of polymer functionalization methods for biomedical applications, water filtration membranes, and food science -Contains discussions of the key surface modification methods, including plasma and chemical techniques, as well as applications for nanotechnology, environmental filtration, food science, and biomedicine -Includes contributions from a team of international renowned experts Written for polymer chemists, materials scientists, plasma physicists, analytical chemists, surface physicists, and surface chemists, Surface Modification of Polymers offers a comprehensive and application-oriented review of the important functionalization methods with a special focus on biomedical applications, membrane science, and food science.
Download or read book Polymer Brushes written by Vikas Mittal and published by CRC Press. This book was released on 2012-03-27 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer Brushes: Substrates, Technologies, and Properties covers various aspects of polymer brush technology, including synthesis, properties, performance, and applications. It presents both experimental details and theoretical insights to enable a better understanding of the brush system.After an overview of polymer brush systems, the book discuss
Download or read book Tailoring Surfaces Modifying Surface Composition And Structure For Applications In Tribology Biology And Catalysis written by Nicholas D Spencer and published by World Scientific. This book was released on 2011-03-08 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this book is surface modification, with the goal of tailoring materials for a specific application. By means of this approach, ideal bulk properties of a material, such as its tensile strength (temperature stability, density, or even cost) can be combined with optimized surface properties, such as hardness, biocompatibility, low or high friction or adhesion, water repellency or wettability, or catalytic activity.The works of the author — many of his crucial papers are included — deal with the understanding and modification of surfaces and span fields including catalysis, analytical surface science, self-assembled monolayers, tribology, biomaterials, superhydrophobicity and polymer coatings.
Download or read book Biomimetic Polymers written by C.G. Gebelein and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: The term biomimetic is comparatively new on the chemical scene, but the concept has been utilized by chemists for many years. Furthermore, the basic idea of making a synthetic material that can imitate the func tions of natural materials probably could be traced back into antiquity. From the dawn of creation, people have probably attempted to duplicate or modify the activities of the natural world. (One can even find allusions to these attempts in the Bible; e. g. , Genesis 30. ) The term "mimetic" means to imitate or mimic. The word "mimic" means to copy closely, or to imitate accurately. Biomimetic, which has not yet entered most dictionaries, means to imitate or mimic some specific bio logical function. Usually, the objective of biomimetics is to form some useful material without the need of utilizing living systems. In a simi lar manner, the term biomimetic polymers means creating synthetic poly mers which imitate the activity of natural bioactive polymers. This is a major advance in polymer chemistry because the natural bioactive polymers are the basis of life itself. Thus, biomimetic polymers imitate the life process in many ways. This present volume delineates some of the recent progress being made in this vast field of biomimetic polymers. Chemists have been making biomimetic polymers for more than fifty years, although this term wasn't used in the early investigations.
Download or read book Polymer Brush Films with Varied Grafting and Cross Linking Density via SI ATRP written by Inga Lilge and published by Springer. This book was released on 2017-09-13 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: In her research, Inga Lilge focuses on a systematic study of poly(acrylamide) (PAAm) brushes prepared by surface-initiated atom transfer radical polymerization (SI-ATRP). In addition to the analysis of the time dependence of the polymer brush growth, the conformation of the polymer brushes is varied by grafting or cross-linking density. The results have practical implications for the study of cellular interactions on PAAm brushes since cell-substrate interactions are known to influence various cell characteristics, such as migration and adhesion.
Download or read book Plasma Surface Modification of Polymers Relevance to Adhesion written by Kash L. Mittal and published by CRC Press. This book was released on 2014-04-29 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of invited papers (previously published in special issues of the Journal of Adhesion Science and Technology) written by internationally recognized researchers actively working in the field of plasma surface modification. It provides a current, comprehensive overview of the plasma treatment of polymers. In contrast to plasm
Download or read book Pollution Assessment for Sustainable Practices in Applied Sciences and Engineering written by Abdel-Mohsen O. Mohamed and published by Butterworth-Heinemann. This book was released on 2020-11-10 with total page 1170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pollution Assessment for Sustainable Practices in Applied Sciences and Engineering provides an integrated reference for academics and professionals working on land, air, and water pollution. The protocols discussed and the extensive number of case studies help environmental engineers to quickly identify the correct process for projects under study. The book is divided into four parts; each of the first three covers a separate environment: Geosphere, Atmosphere, and Hydrosphere. The first part covers ground assessment, contamination, geo-statistics, remote sensing, GIS, risk assessment and management, and environmental impact assessment. The second part covers atmospheric assessment topics, including the dynamics of contaminant transport, impacts of global warming, indoor and outdoor techniques and practice. The third part is dedicated to the hydrosphere including both the marine and fresh water environments. Finally, part four examines emerging issues in pollution assessment, from nanomaterials to artificial intelligence. There are a wide variety of case studies in the book to help bridge the gap between concept and practice. Environmental Engineers will benefit from the integrated approach to pollution assessment across multiple spheres. Practicing engineers and students will also benefit from the case studies, which bring the practice side by side with fundamental concepts. Provides a comprehensive overview of pollution assessment Covers land, underground, water and air pollution Includes outdoor and indoor pollution assessment Presents case studies that help bridge the gap between concepts and practice
Download or read book Polymer and Biopolymer Brushes written by Omar Azzaroni and published by John Wiley & Sons. This book was released on 2018-01-11 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt: Serves as a guide for seasoned researchers and students alike, who wish to learn about the cross-fertilization between biology and materials that is driving this emerging area of science This book covers the most relevant topics in basic research and those having potential technological applications for the field of biopolymer brushes. This area has experienced remarkable increase in development of practical applications in nanotechnology and biotechnology over the past decade. In view of the rapidly growing activity and interest in the field, this book covers the introductory features of polymer brushes and presents a unifying and stimulating overview of the theoretical aspects and emerging applications. It immerses readers in the historical perspective and the frontiers of research where our knowledge is increasing steadily—providing them with a feeling of the enormous potential, the multiple applications, and the many up-and-coming trends behind the development of macromolecular interfaces based on the use of polymer brushes. Polymer and Biopolymer Brushes: Fundamentals and Applications in Materials offers chapters on: Functionalization of Surfaces Using Polymer Brushes; Polymer Brushes by ATRP and Surface-Mediated RAFT Polymerization for Biological Functions; Electro-Induced Copper Catalyzed Surface Modification with Monolayer and Polymer Brush; Polymer Brushes on Flat and Curved Substrates; Biomimetic Anchors for Antifouling Polymer Brush Coating; Glycopolymer Brushes Presenting Sugars in Their Natural Form; Smart Surfaces Modified with Phenylboronic Acid-Containing Polymer Brushes; DNA Brushes; Polymer Brushes as Interfacial Materials for Soft Metal Conductors and Electronics; and more. Presents a comprehensive theory/simulation section that will be valuable for all readers Includes chapters not only on the biological applications of polymer brushes but also on biological systems that resemble polymer brushes on flat surfaces Addresses applications in coatings, friction, sensors, microelectromechanical systems, and biomaterials Devotes particular attention to the functional aspects of hybrid nanomaterials employing polymer brushes as functional units Polymer and Biopolymer Brushes: Fundamentals and Applications in Materials is aimed at both graduate students and researchers new to this subject as well as scientists already engaged in the study and development of polymer brushes.
Download or read book Polymer Surfaces and Interfaces written by Manfred Stamm and published by Springer Science & Business Media. This book was released on 2008-01-26 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: In what is an extremely practical and applicable new work, experts provide concise explanations, with examples and illustrations, of the key techniques in this important field. In each case, after basic principles have been reviewed, applications of the experimental techniques are discussed and illustrated with specific examples. Scientists and engineers in research and development will benefit from an application-oriented book that helps them to find solutions to both fundamental and applied problems. They will know that the surfaces and interfaces of polymers play an important role in most of the application areas of polymers, from moulds, foils, and composites, to biomaterials and applications in micro- and nanotechnology.
Download or read book Light Scattering from Polymer Solutions and Nanoparticle Dispersions written by Wolfgang Schärtl and published by Springer Science & Business Media. This book was released on 2007-08-13 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Light scattering is a very powerful method for characterizing the structure of polymers and nanoparticles in solution. As part of the Springer Laboratory series, this book provides a simple-to-read and illustrative textbook probing the seemingly very complicated topic of light scattering from polymers and nanoparticles in dilute solution, and goes further to cover some of the latest technical developments in experimental light scattering.
Download or read book Bioinspired Materials Science and Engineering written by Guang Yang and published by John Wiley & Sons. This book was released on 2018-07-04 with total page 787 pages. Available in PDF, EPUB and Kindle. Book excerpt: An authoritative introduction to the science and engineering of bioinspired materials Bioinspired Materials Science and Engineering offers a comprehensive view of the science and engineering of bioinspired materials and includes a discussion of biofabrication approaches and applications of bioinspired materials as they are fed back to nature in the guise of biomaterials. The authors also review some biological compounds and shows how they can be useful in the engineering of bioinspired materials. With contributions from noted experts in the field, this comprehensive resource considers biofabrication, biomacromolecules, and biomaterials. The authors illustrate the bioinspiration process from materials design and conception to application of bioinspired materials. In addition, the text presents the multidisciplinary aspect of the concept, and contains a typical example of how knowledge is acquired from nature, and how in turn this information contributes to biological sciences, with an accent on biomedical applications. This important resource: Offers an introduction to the science and engineering principles for the development of bioinspired materials Includes a summary of recent developments on biotemplated formation of inorganic materials using natural templates Illustrates the fabrication of 3D-tumor invasion models and their potential application in drug assessments Explores electroactive hydrogels based on natural polymers Contains information on turning mechanical properties of protein hydrogels for biomedical applications Written for chemists, biologists, physicists, and engineers, Bioinspired Materials Science and Engineering contains an indispensible resource for an understanding of bioinspired materials science and engineering.
Download or read book Cell Surface Engineering written by Rawil Fakhrullin and published by Royal Society of Chemistry. This book was released on 2014-07-24 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: A summary of the recent achievements in surface-functionalised cells including fabrication, characterisation, applications and nanotoxicity.
Download or read book Photocatalytic Polymer Brush Functionalized Glass Beads for Enhanced Heterogeneous Photocatalysis written by Kirsten Bell and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photocatalysis uses readily available light as a renewable energy source to perform a plethora of organic and polymer chemistries, while not requiring high temperatures or pressures. However, many reported light-mediated transformations use homogeneous catalysis approaches, which invariably entails a potential for catalyst contamination. This can lead to discoloration or degradation of synthetic products. Heterogeneous photocatalysis is a viable alternative to reuse catalysts, mitigate catalyst impurities, and improve both sustainability and cost-effectiveness. Recent studies on heterogeneous photocatalytic systems focus on nanoparticles, polymer networks, and metal organic frameworks (MOFs). While each of these approaches introduces their own advantages and challenges, they all have one in common: complex cleaning and recovery processes. This dissertation focuses on the development of a micron-size heterogeneous photocatalyst platform to facilitate the separation process after photocatalysis through simple filtration. Inspired by recent advances in photoredox active polymers and their studies demonstrating the success of functional polymers, the concept transpired to create an effective photocatalyst that can be recycled for multiple uses. The inherent nature of polymer brushes permits the ability for a tunable heterogeneous catalyst. By modifying the polymer brush chemistry, the chemical environment surrounding the photocatalyst can be tailored to enhance interactions during the photoredox process. Variables interrogated in the following work include degrees of photocatalyst incorporation, polymer brush thickness, stability against hydrolysis, and influence of different comonomers and reaction media. The catalytic efficiency is explored through numerous organic reactions and polymer syntheses, such as radical dehalogenations, reversible-deactivation radical polymerizations, and degradation of organic pollutants found in wastewater streams. Recyclability is considered throughout to demonstrate a robust and practically feasible heterogeneous photocatalyst. This user- and eco-friendly approach stands to enhance the ability for scale-up production for heterogeneous photocatalysis. The fundamental research established provides a recyclable photocatalytic platform that can be readily adopted to incorporate other photocatalysts and afford tailoring to other solvents. As such, this concept can transcend beyond the micron-scale supports and advance the fields of macromolecular and photoredox chemistry in their entirety by enabling adaptation of further robust heterogeneous catalysts.
