Download or read book Synthesis of Polymer Brush by Nanoporous Surface initiated Polymerization written by and published by . This book was released on 2004 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Patterning Surfaces Using Block Copolymer Polymer Thin Films and Polymer Brushes Synthesized by a Light Mediated Controlled Radical Polymerization Technique written by Justin Ernest Poelma and published by . This book was released on 2014 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymeric materials are ideal for modifying the properties of a wide range of surfaces due to their structural and chemical versatility. This dissertation describes the synthesis and utility of block copolymers and polymer brushes for patterning surfaces. The effect of a cyclic molecular architecture on feature size in phase separated block copolymer thin films is discussed, as well as the synthesis of acid-cleavable block copolymers for the fabrication of highly ordered nanoporous polymer thin films. In addition to polymers synthesized in solution for deposition onto surfaces, the synthesis of polymer brushes by surface-initiated polymerizations was also studied. A new light-mediated polymerization technique catalyzed by Ir(ppy)3 was employed as the surface-initiated polymerization technique. This polymerization is highly responsive to visible light and can be used to readily access patterns of polymer brushes. Using light as an external stimulus for brush growth or functionalization by a light-mediated atom transfer radical addition reaction, the molecular weight, architecture, grafting density, and chemical functionality of polymer brushes could be spatially controlled on surfaces. Finally, the synthesis of polymers by the Ir(ppy)3-catalyzed polymerization in solution was improved by utilizing a continuous flow reactor.

Download or read book Surface initiated Polymerizations on Initiator Anchored Substrates written by Zhiyi Bao and published by . This book was released on 2006 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface initiated Living Polymerizations on Gold written by Chong-bŏm Kim and published by . This book was released on 2002 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 342 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 discusses methods for grafting organic brushes from the surface of clay platelets and for the covalent grafting of PNIPAm brushes. It then describes ferrocene polymer brushes, nonfouling brushes on poly(ethylene terephthalate) film surfaces, brushes formed on the inner surface of cylindrical pores, and the "zipper brush" approach. The authors examine the use of scanning electrochemical microscopy for analyzing brushes and compare surface-controlled atom transfer radical polymerization and surface-controlled single-electron transfer living radical polymerization. They also explore the application of polymer brushes in the chromatographic separations of viruses and proteins and the suppression of proteins and cell adhesions. The text concludes with a look at how polymer brushes are synthesized by surface-initiated iniferter-mediated polymerization. This book provides a one-stop reference on the various substrates and technologies used to synthesize polymer brushes. The hands-on information in the text will help readers choose the proper synthesis methods and materials for their system.

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 Synthesis and Application of Polymer Brush grafted Nanoparticles as Hydrogel Gelators and Lubricant Additives written by Roger Anthony Emory Wright and published by . This book was released on 2016 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes the synthesis of polymer brush-grafted nanoparticles (hairy NPs) and an analysis of their behavior or utility in multiple areas. The hairy NPs were synthesized from silica NPs functionalized with initiating moieties by surface-initiated atom transfer radical polymerization. A brief introduction to hairy NPs, with a focus on the synthesis and behavior of stimuli-responsive polymer brush-grafted particles, is given in Chapter 1 to provide context for this work. Chapters 2 and 3 present the synthesis of thermosensitive diblock copolymer brush-grafted nanoparticles designed as hairy NP analogues in place of thermosensitive block copolymers micelles for the construction of hybrid, physical hydrogels. Chapter 2 details a series of hairy NPs with a thermosensitive poly(methoxydi(ethylene glycol) methacrylate) (PDEGMMA) inner block and a charge-bearing, poly(DEGMMA-co-2-(methacryloyloxy)ethyltrimethylammonium iodide) (PDEGMMA-co-TMAEMA-I) outer block. These hairy particles underwent a reversible, cooling-induced gelation at moderate concentrations in water, based on the packing of hairy NPs due to the LCST-driven increase in brush volume fraction upon cooling. Another series of thermosensitive hairy NPs was made with brushes composed of P(TMAEMA-I)-b-PDEGMMA, which exhibited a heating-induced reversible gelation at concentrations as low as 3 wt % in water, due to the association of PDEGMMA outer blocks at temperatures above their LCST. The inner hydrophilic polyelectrolyte block served to bridge these domains and NPs to form a three-dimensional gel network. Chapter 4 details the use of NPs grafted with oil-soluble poly(lauryl mathacrylate) as lubricant additives. These hairy NPs showed superior stability in a poly(alphaolefin) (PAO) base lubricating oil, and the addition of 1.0 wt % hairy NPs to PAO yielded significant reductions in both friction and material wear. These gains were attributed to the formation of a load-bearing tribofilm at the rubbing interface. Chapter 5 explores the brush microphase separation of poly(n-butyl acrylate)-b-polystyrene (PnBA-b-PS) brush-grafted particles with PnBA as inner block. From TEM analysis, there appeared an evolution of phase morphology from a stripe-like nanostructure to a more uniform layered structure with increasing PS molecular weight, in qualitative agreement with simulation studies. Chapter 6 includes a look back on this dissertation work in its entirety and possible future work.

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 Synthesis and Self assembly of Advanced Bottlebrush Block Copolymers written by Justin Bolton and published by . This book was released on 2012 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using the grafting-from approach, three novel well-defined bottlebrush block copolymers were synthesized using various controlled polymerization techniques. Resulting macromolecules were characterized by GPC and 1H NMR and then self-assembled into nanostructured materials for further characterization. Asymmetric polystyrene-polylactide (PS-PLA) bottlebrush block copolymers have been shown to self-assemble into a cylindrical morphology with large domain spacings. PLA cylinders can be selectively etched out of the shear-aligned polymer monoliths to generate nanoporous materials with an average cylindrical pore diameter of 55 nm. The remaining bottlebrush backbone provides a functional, hydrophilic coating inside the nanopores. This methodology significantly expands the range of pore sizes attainable in block copolymer based nanoporous materials.^A polystyrene-poly(methyl methacrylate) (PS-PMMA) bottlebrush block copolymer with asymmetric branches was synthesized by grafting from a symmetrical backbone containing a novel dual vinyl initiation system and characterized by atomic force microscopy (AFM) and small-angle x-ray scattering (SAXS). The block copolymer backbone was prepared by sequential reversible addition-fragmentation chain transfer (RAFT) copolymerization of solketal methacrylate and 2-(bromoisobutyryl)ethyl methacrylate (BIEM). From the poly(BIEM) segment, PMMA branches were grafted by atom transfer radical polymerization (ATRP). Solketal groups were then subjected to hydrolysis and functionalized with a RAFT agent. Subsequently, from RAFT sites of the poly(SM) segment, polystyrene branches were grafted to yield the final bottlebrush block copolymer.^The resulting polymer was found to have a vertically oriented cylindrical morphology by AFM with an average cylinder diameter of 45 nm; morphology was also confirmed by SAXS analysis. A novel polylactide-poly(methyl methacrylate)-polystyrene (PLA-PMMA-PS) triblock bottlebrush block copolymer was synthesized from a triblock backbone employing ATRP, RAFT and ROP techniques. Novel 5-TMS-4-pentyn-1-ol methacrylate (TPYM) with protected alkyne functionality was developed and characterized as a homopolymer. Click chemistry was used to introduce RAFT groups along the homopolymer backbone. Subsequently, PS branches were grafted from RAFT initiators along the backbone. A well-defined poly(SM-b-BIEM-b-TPYM) backbone was synthesized followed by grafting of PMMA brushes from the BIEM segment by ATRP.^Post PMMA grafting, the ATRP end groups were removed and the TMS group was deprotected to allow functionalization of the alkyne with an azido terminated RAFT agent by way of Huisgen 1,3-dipolar cycloaddition. From the RAFT sites, PS was grafted followed by deprotection of the hydroxyl functionality of the SM block. Resulting liberated hydroxyls were used to initiate PLA grafts, yielding the final well-defined triblock bottlebrush block copolymer (PLA-PMMA-PS).

Download or read book Nanoporous Materials written by Qiang Xu and published by CRC Press. This book was released on 2013-01-04 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past two decades, the field of nanoporous materials has undergone significant developments. As these materials possess high specific surface areas, well-defined pore sizes, and functional sites, they show a great diversity of applications such as molecular adsorption/storage and separation, sensing, catalysis, energy storage and conversion,

Download or read book Chemoresponsive Materials written by Hans-Jörg Schneider and published by Royal Society of Chemistry. This book was released on 2015-07-13 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: Smart materials stimulated by chemical or biological signals are of interest for their many applications including drug delivery, as well as in new sensors and actuators for environmental monitoring, process and food control, and medicine. In contrast to other books on responsive materials, this volume concentrates on materials which are stimulated by chemical or biological signals. Chemoresponsive Materials introduces the area with chapters covering different responsive material systems including hydrogels, organogels, membranes, thin layers, polymer brushes, chemomechanical and imprinted polymers, nanomaterials, silica particles, as well as carbohydrate- and bio-based systems. Many promising applications are highlighted, with an emphasis on drug delivery, sensors and actuators. With contributions from internationally known experts, the book will appeal to graduate students and researchers in academia, healthcare and industry interested in functional materials and their applications.

Download or read book Advanced Polymer Nanoparticles written by Vikas Mittal and published by CRC Press. This book was released on 2010-07-13 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer latex particles continue to become increasingly important in numerous commercial applications. Advanced synthesis techniques are the key to developing new functionality for nanoparticles. These methods make it possible to tailor the size, chemical composition, or properties of these particles, as well as the molecular weight of the polymer

Download or read book Advances in Membrane Technologies written by Amira Abdelrasoul and published by BoD – Books on Demand. This book was released on 2020-03-04 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Membrane technologies are currently the most effective and sustainable methods utilized in diversified water filtration, wastewater treatment, as well as industrial and sustainable energy applications. This book covers essential subsections of membrane separation and bioseparation processes from the perspectives of technical innovation, novelty, and sustainability. The book offers a comprehensive overview of the latest improvements and concerns with respect to membrane fouling remediation techniques, issues of bioincompatibility for biomedical applications, and various subareas of membrane separation processes, which will be an efficient resource for engineers.

Download or read book Chemically Modified Nanopores and Nanochannels written by Mario Tagliazucchi and published by William Andrew. This book was released on 2016-08-29 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemically Modified Nanopores and Nanochannels is devoted to chemically modified nanopores and nanochannels, and covers the fundamentals of transport in chemically modified systems, an account of the different preparation and characterization techniques of chemically modified nanopores, their applications, and case studies. The book is designed for materials and biomaterials scientists, biomedical engineers, chemists, and chemical engineers who are interested in designing and utilizing processes to synthesize, modify, characterize, use, and model nanopores. The strong chemical focus of the book differentiates it from other books published on nanopores, which traditionally focus either on physics, biophysics, and nanofabrication (solid-state nanopores) or biophysics and biology (biological ion channels and pores). Explains how the chemical modification of nanopores and nanochannels can be used in filtration, membranes, and sensing Provides advanced coverage of novel synthetic applications Focuses on the latest developments in nanopore and nanochannel engineering Presents an account of the different preparation and characterization techniques of chemically modified nanopores, their applications, and case studies

Download or read book Nitroxides written by Gertz I. Likhtenshtein and published by Springer Nature. This book was released on 2020-01-03 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by a pioneer in the development of spin labeling in biophysics, this expert book covers the fundamentals of nitroxide spin labeling through cutting-edge applications in chemistry, physics, materials science, molecular biology, and biomedicine. Nitroxides have earned their place as one of the most popular organic paramagnets due to their suitability as inhibitors of oxidative processes, as a means to polarize magnetic nuclei, and, in molecular biology, as probes and labels to understand molecular structures and dynamics AS DRAGS FOR CANCER AND OTHER DISEASES. Beginning with an overview of the basic methodology and nitroxides’ 145-year history, this book equips students with necessary background and techniques to undertake original research and industry work in this growing field.

Download or read book Semiconducting Polymers written by Christine Luscombe and published by Royal Society of Chemistry. This book was released on 2016-10-12 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconducting polymers are of great interest for applications in electroluminescent devices, solar cells, batteries and diodes. In recent years vast advances have been made in the area of controlled synthesis of semiconducting polymers, specifically polythiophenes. The book is separated into two main sections, the first will introduce the advances made in polymer synthesis, and the second will focus on the microstructure and property analysis that has been enabled because of the recent advances in synthetic strategies. Edited by one of the leaders in the area of polythiophene synthesis, this new book will bring the field up to date with more recent models for understanding semiconducting polymers. The book will be applicable to materials and polymers chemists in industry and academia from postgraduate level upwards.

Download or read book Polymer Micro and Nanografting written by Celestino Padeste and published by William Andrew. This book was released on 2015-02-10 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers have proven to be very suitable materials for topographic structuring, in particular in nanoreplication processes. Micro- and Nanografting strategies address the possibility for the formation of chemical patterns and structures on or in polymeric substrates using relatively simple processes. Polymer Micro- and Nanografting focuses on grafting techniques characterization and applications for the particular combination of polymer layers on polymer substrates. The authors, leaders in this area of research, provide a comprehensive survey on polymer-on-polymer grafting, covering the latest developments and future applications. Provides a comprehensive survey on polymer-on-polymer grafting, covering the latest developments and future applications Focuses on grafting techniques, characterization and applications for the particular combination of polymer layers on polymer substrates Concentrates on the combination of structuring methods and chemical functionalization of polymers Addresses the possibility for the formation of chemical patterns and structures on or in polymeric substrates