Download or read book Investigations of the Structure and Morphology of Random Block Copolymers written by Robert M. Briber and published by . This book was released on 1984 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Yearbook written by Richard A. Pethrick and published by CRC Press. This book was released on 1986 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains reviews on state-of-the-art Japanese research presented in the annual Spring and Autumn meetings of the Japanese Polymer Science Society. The aim of this section is to make information on the progress of Japanese Polymer Science, and on topics of current interest to polymer scientists in Japan, more easily available worldwide.
Download or read book Soft Matter Characterization written by Redouane Borsali and published by Springer Science & Business Media. This book was released on 2008-07-28 with total page 1490 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2-volume set includes extensive discussions of scattering techniques (light, neutron and X-ray) and related fluctuation and grating techniques that are at the forefront of this field. Most of the scattering techniques are Fourier space techniques. Recent advances have seen the development of powerful direct imaging methods such as atomic force microscopy and scanning probe microscopy. In addition, techniques that can be used to manipulate soft matter on the nanometer scale are also in rapid development. These include the scanning probe microscopy technique mentioned above as well as optical and magnetic tweezers.
Download or read book Structural Investigations of Block Copolymer Melts and Solutions written by Mary Beth Kossuth and published by . This book was released on 1999 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2002 with total page 896 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Block Polymers written by S. L. Aggarwal and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block polymers represent another milestone in the preparation of polymers of controlled structure. Catalysts and polymerization methods that allowed the preparation of polymers in which the stereo- and geometric isomerism of the monomer units could be con trolled have indeed been among the major developments in polymer science during the last decade. The synthesis of block polymers, in which the sequence length of the comonomer units can be con trolled, portends equally important developments in the science and technology of polymers. The papers collected in this volume cover primarily the pro ceedings of the most recent symposium on block polymers, sponsored by the Division of Polymer Chemistry of the American Chemical Society. It was held in New York City during the Society's 158th National Meeting in September, 1969. Additional contributions from selected authors were invited especially for this book to achieve the most up-to-date account of the advances that have been made since the development of the thermoplastic elastomers that first brought into focus this important area of research. The first two papers in this volume draw attention to the various problems that should be considered in the preparation of block polymers of precisely defined structure from styrene and butadiene or isoprene by anionic polymerization. Characterization of block polymers presents many problems and there is a paucity of systematic work in this area. Attention has been given to the di lute solution properties of block polymers,however, in one of the papers in this volume.
Download or read book Processing Structure and Properties of Block Copolymers written by M.J. Folkes and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block copolymers represent an important class of multi-phase material, which have received very widespread attention, particularly since their successful commercial development in the mid-1960s. Much of the interest in these polymers has arisen because of their rather remarkable micro phase morphology and, hence, they have been the subject of extensive microstructural examination. In many respects, the quest for a comprehensive interpretation of their structure, both theoretically and experimentally, has not been generally matched by a corresponding enthusiasm for developing structure/property relationships in the context of their commercial application. Indeed, it has been left largely to the industrial companies involved in the development and utilization of these materials to fulfil this latter role. While it is generally disappointing that a much greater synergism does not exist between science and technology, it is especially sad in the case of block copolymers. Thus these materials offer an almost unique opportunity for the application of fundamental structural and property data to the interpretation of the properties of generally processed artefacts. Accordingly, in this book, the editor has drawn together an eminent group of research workers, with the specific intention of highlighting some of those aspects of the science and technology of block copolymers that are potentially important if further advances are to be made either in material formulation or utilization. For example, special consideration is given to the relationship between the flow properties of block copo lymers and their microstructure.
Download or read book Asymmetric Copolymers written by Bárbara Isabel Farias Mancilla and published by . This book was released on 2020 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block copolymers are made from polymer chains of different chemical composition that are covalently joined via their respective end groups. On the other hand, there are statistical copolymers whose monomers are randomly copolymerized together. Between these structures exist asymmetric copolymers, which are defined as a distribution of monomers within the chain which is neither completely segregated as for a block copolymer nor statistically distributed in a manner that is independent of the position along the chain as in the case of statistical copolymers. Based on the latter, the properties of asymmetric copolymers are expected to combine characteristics of block and statistical structures. In this investigation, acrylic acid-(n-butyl acrylate) (AA-n-BA) copolymers and dimethylacrylamide-N-isopropylacrylamide (DMA-NIPAM) copolymers, with targeted molecular weights of 10 kg mol-1 and 20 kg mol-1, were obtained by RAFT polymerization using forced and stepwise synthesis. Both copolymer systems are stimuli-responsive polymers: macromolecules which undergo phase transitions when they experience subtle changes in the environmental conditions. P(AA-n-BA) copolymers are pH-responsive and P(DMA-NIPAM) copolymers are thermosensitive. The composition of the copolymers was always the same (50% AA or 50% NIPAM), but the distribution of the monomer units within the chain was different. Block, statistical, gradient, asymmetric diblock and triblock structures were obtained with the aim to compare their physical and self-assembly properties. The macromolecular characteristics of copolymers were obtained by nuclear magnetic resonance spectroscopy (1H NMR) and size exclusion chromatography (SEC). P(AA-nBA) copolymers in solution at different pH were studied by dynamic light scattering (DLS), cryogenic transmission electron microscopy (cryo-TEM) and small angle neutron scattering (SANS) and it was possible to demonstrate the changes in size and self-assembly behavior as a function of pH of the copolymers solutions. The results showed that the P(AA-nBA) asymmetric copolymers form aggregates of different morphology depending on the pH, for example vesicles at pH 4 or micelles and worms at pH 5. On the other hand, the morphology of block copolymers with the same composition, is not influenced by changes in pH. P(DMA-NIPAM) copolymers in solutions were analyzed by DLS, SANS and 1H NMR as a function of temperature. The evolution of hydrodynamic size as a function of temperature could be followed by DLS and the temperature-induced micellization was analyzed by SANS whereas by 1H NMR, the temperature-induced collapse and resulting loss of mobility of the polymer chains could be followed at a molecular level. Interesting results were obtained, since low molar mass block copolymers (Mn = 10 kg mol-1) displayed similar behavior to the corresponding to high molar mass gradient copolymer (Mn = 20 kg mol-1). This phenomenon was observed by SANS and 1H NMR, and it was attributed to the short length scale of the block copolymer, in which the chain is short enough that a significant fraction of the NIPAM units in the block copolymer are strongly affected by the DMA of the adjoining block, leading to a gradual change in the effective composition of the polymer as a function of chain length.
Download or read book Block Copolymers written by Francisco Balta Calleja and published by CRC Press. This book was released on 2000-06-09 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt: A summary of block copolymer chemical structures and synthesis. It discusses physical methods of characterization such as computer simulation, microhardness, dielectric spectroscopy, thermal mechanical relaxation, ultrasonic characterization, transmission electron microscopy, X-ray scattering, and NMR, among others. It also outlines rheological and processing parameters in the multiphase polymer systems with stable microstructures.
Download or read book Block Copolymers written by Nikos Hadjichristidis and published by John Wiley & Sons. This book was released on 2003-04-28 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers may be classified as either homopolymers, consisting of one single repeating unit, or copolymers, consisting of two or more distinct repeating units. Block copolymers contain long contiguous blocks of two or more repeating units in the same polymer chain. Covering one of the hottest topics in polymer chemistry, Block Copolymers provides a coherent overview of the synthetic routes, physical properties, and applications of block copolymers. This pioneering text provides not only a guideline for developing synthetic strategies for creating block copolymers with defined characteristics, but also a key to the relationship between the physical properties of block copolymers and the structure and dynamics of materials. Covering features of the chemistry and physics of block copolymers that are not found in comparable texts, Block Copolymers illustrates the structure-activity relationship of block copolymers and offers suggestions for the design of specific applications. Divided into five sections-Block Copolymers includes chapters on: * Block Copolymers by Chemical Modification of Precursor Polymers * Nonlinear Block Copolymers * Adsorption of Block Copolymers at Solid-Liquid Interfaces * Theory of Block Copolymer Segregation * Phase Transformation Kinetics * Block Copolymer Morphology * Block Copolymer Dynamics Polymer chemists, physicists, chemical engineers, and materials scientists, as well as graduate students in polymer science, will find Block Copolymers to be an invaluable text.
Download or read book Polymer Yearbook written by Richard Arthur Pethrick and published by . This book was released on 1984 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1999 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Morphology written by Qipeng Guo and published by John Wiley & Sons. This book was released on 2016-03-21 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: With a focus on structure-property relationships, this book describes how polymer morphology affects properties and how scientists can modify them. The book covers structure development, theory, simulation, and processing; and discusses a broad range of techniques and methods. • Provides an up-to-date, comprehensive introduction to the principles and practices of polymer morphology • Illustrates major structure types, such as semicrystalline morphology, surface-induced polymer crystallization, phase separation, self-assembly, deformation, and surface topography • Covers a variety of polymers, such as homopolymers, block copolymers, polymer thin films, polymer blends, and polymer nanocomposites • Discusses a broad range of advanced and novel techniques and methods, like x-ray diffraction, thermal analysis, and electron microscopy and their applications in the morphology of polymer materials
Download or read book Silicon containing Block Copolymers with Well defined Branched Architectures written by Alejandra Teresa García Marcos and published by . This book was released on 2006 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structure property processing Relations in Sulfonated Block Copolymer Membranes written by Phuc Vinh Truong and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ionic block copolymers combine the functionality of ionomers with the mechanical properties of thermoplastics, and are widely studied for applications in water purification and electrochemical devices. Membranes (thin films) are often prepared by solution casting. As the solvent evaporates, the strong incompatibility between ionic and non-ionic segments will trap non-equilibrium structures in the film. Consequently, the equilibrium block copolymer phase diagrams are poor predictors of membrane morphology, making it difficult to engineer the optimal domain sizes and transport pathways. The objective of this dissertation is to establish structure-property- processing relations of sulfonated pentablock copolymer (SPC) membranes. Films were prepared by casting from solvents of varying polarity, as the choice of solvent controls the solution state structure, and were characterized with complementary measurements that include X-ray scattering, microscopy, infrared spectroscopy, water uptake, impedance spectroscopy and tensile tests. First, we investigate the structure and transport properties of lamellar SPC membranes. All films were cast from mixtures of toluene and n-propanol. As the polarity of the casting solvent increases, the bulk structure becomes more disordered with a higher defect density, and the surface becomes more hydrophilic. These structural changes lead to enhancements in water uptake and proton conductivity. The onset of structural disorder coincides with a change in solvent selectivity towards the sulfonated domains. Therefore, the sulfonated block becomes more swollen during processing, which may induce defects that connect the neighboring sulfonated domains and produce a continuous structure. Next, we investigate the effects of hydration cycles on the structure and performance of commercial SPC films, which is relevant when evaluating their potential as water purification membranes or proton-conducting layers. We find that hydration cycling drives a structural transition from isolated micelles with a sulfonated core to a network of percolating sulfonated domains, which is beneficial for transport. However, hydration cycling can also induce mechanical instabilities that reduce swelling, water uptake and ductility. Consequently, transport properties are governed by the tradeoff between nanoscale restructuring and macroscale buckling. Significantly, we believe that our methodology and findings will be useful for design, optimization, and fundamental investigations of other ionic block or random polymer systems.
Download or read book Block Polymers written by American Chemical Society. Meeting and published by . This book was released on 1970 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1989 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
