Download or read book Structure and Properties of Hydrogen and Covalently Bonded Side Group Liquid Crystalline Block Copolymers written by Chinedum Osuji and published by . This book was released on 2003 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) The material was characterized optically and changes in temperature were used to reversibly manipulate the efficiency and location of the stop-band. The optical properties of the polymer as a function of temperature were correlated to changes in the order parameter of the liquid crystalline phase, observed as a function of temperature.
Download or read book Hydrogen bonded Side Chain Liquid Crystalline Block Copolymer written by Chi-Yang Chao and published by . This book was released on 2003 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrogen bonded Interpolymer Complexes written by Vitaliy V. Khutoryanskiy and published by World Scientific. This book was released on 2009 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been an increased interest among researchers in hydrogen-bonded interpolymer complexes since the first pioneering papers were published in the early 1960s. Several hundred research papers have been published on various aspects of complex formation reactions in solutions and interfaces, properties of interpolymer complexes and their potential applications. This book focuses on the latest developments in the area of interpolymer complexation via hydrogen bonding. It represents a collection of original and review articles written by recognized experts from Germany, Greece, Kazakhstan, Poland, Romania, Russia, UK, Ukraine, and the USA. It highlights many important applications of interpolymer complexes, including the stabilization of colloidal systems, pharmaceuticals, and nanomaterials.
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 Hydrogen Bonded Polymers written by Wolfgang Binder and published by Springer Science & Business Media. This book was released on 2007-03-16 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: Control of polymeric structure is among the most important endeavours of modern macromolecular science. In particular, tailoring the positioning and strength of intermolecular forces within macromolecules by synthetic methods and thus gaining structural control over the final polymeric materials has become feasible, resulting in the field of supramolecular polymer science. Besides other intermolecular forces, hydrogen bonds are unique intermolecular forces enabling the tuning of material properties via self-assembly processes over a wide range of interactions strength ranging from several kJmol to several tens of kJmol . Central for the formation of these structures are precursor molecules of small molecular weight (usually lower than 10 000), which can assemble in solid or solution to aggregates of defined geometry.
Download or read book Modeling Self assembly and Structure property Relationships in Block Copolymers written by Manas Ravindra Shah and published by . This book was released on 2009 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block copolymers have been subject of tremendous research interest owing to their capability of undergoing self-assembly which allows them to tailor their electrical, optical, and mechanical properties. Statistical mechanics of flexible block copolymers is well understood. However, there are many unresolved issues with confinement of block copolymers as well as structure formation in block copolymers having non-flexible polymer blocks. We develop mean field theory models to address the issues arising in thermodynamics of such complex block copolymers. Also, we develop theoretical formalisms to understand the link between morphology and macroscopic properties in these block copolymers. We study the stability and ordering in thin films of flexible diblock copolymer in the presence of compressible solvent using a combined polymer mean field theory and lattice gas model for binary fluid mixtures. We utilize mean field theory model to understand the self-assembly behavior in side-chain liquid crystalline block copolymers which involve interplay between microphase separation and liquid crystalline ordering of side chain mesogenic units. We extend the field theoretic models for block copolymer to account for self-assembly in semicrystalline block copolymers. The semicrystalline chain is modeled as a semiflexible chain having non-bonded attractions between parallel bonds. We characterize the structure formation in such block copolymers as a function of the rigidity of the semicrystalline chain. Then we extend the formalism to study semicrystalline triblock and pentablock copolymers and evaluate bridging fractions in different sequences of semicrystalline multiblock copolymers. Rod-coil block copolymers have a flexible polymer covalently linked to rigid polymer. Such polymers have potential applications as organic LEDs and photovoltaic devices. We study the self-assembly of such block copolymer under confinement. To make these block copolymers viable as photovoltaic devices, we performed the photovoltaic modeling of devices based on self-assembly of block copolymers. We characterize the interplay between self-assembly and anisotropy of charge transport (arising due to rigid polymer chains) in determining the eventual photovoltaic properties.
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 Design and Applications of Nanostructured Polymer Blends and Nanocomposite Systems written by Sabu Thomas and published by William Andrew. This book was released on 2015-09-22 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design and Applications of Nanostructured Polymer Blend and Nanocomposite Systems offers readers an intelligent, thorough introduction to the design and applications of this new generation of designer polymers with customized properties. The book assembles and covers, in a unified way, the state-of-the-art developments of this less explored type of material. With a focus on nanostructured polymer blends, the book discusses the science of nanostructure formation and the potential performance benefits of nanostructured polymer blends and composites for applications across many sectors: electronics, coatings, adhesives, energy (photovoltaics), aerospace, automotive, and medical devices (biocompatible polymers). The book also describes the design, morphology, and structure of nanostructured polymer composites and blends to achieve specific properties. Covers all important information for designing and selecting the right nanostructured polymer system Provides specialized knowledge on self-repairing, nanofibre and nanostructured multiphase materials, as well as evaluation and testing of nanostructured polymer systems Serves as a reference guide for development of new products in industries ranging from electronics, coatings, and energy, to transport and medical applications Describes the design, morphology, and structure of nanostructured polymer composites and blends to achieve specific properties
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 Concise Polymeric Materials Encyclopedia written by Joseph C. Salamone and published by CRC Press. This book was released on 1998-08-28 with total page 1782 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concise Polymeric Materials Encyclopedia culls the most used, widely applicable articles from the Polymeric Materials Encyclopedia - more than 1,100 - and presents them to you in a condensed, well-ordered format. Featuring contributions from more than 1,800 scientists from all over the world, the book discusses a vast array of subjects related to the: synthesis, properties, and applications of polymeric materials development of modern catalysts in preparing new or modified polymers modification of existing polymers by chemical and physical processes biologically oriented polymers This comprehensive, easy-to-use resource on modern polymeric materials serves as an invaluable addition to reference collections in the polymer field.
Download or read book Liquid Crystalline Polymers written by Vijay Kumar Thakur and published by Springer. This book was released on 2015-11-16 with total page 627 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces anisotropic innovations in liquid crystalline polymers as well as new nanocomposite materials and testing techniques. The authors detail the newest discoveries of material properties, material types and phases, and material characterization. This interdisciplinary work creates valuable links that strengthen the approach to the evolving field of liquid crystalline polymers/ materials.
Download or read book Block Copolymers written by Douglas Russell Greer and published by . This book was released on 2017 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block copolymer (BCP) self-assembly has garnered significant attention for several decades because it can yield ordered structures in a wide range of morphologies with potential or practical applications in many fields. A diblock copolymer is a polymer consisting of two distinct monomers. The monomers are arranged such that there are distinct chains of each monomer, and the chains are covalently linked together to form a single copolymer chain. In BCPs, the enthalpic contributions to free energy are often significant enough overcome entropy, resulting in the formation of microdomains of each type of monomer. This self-assembly is useful for fundamental studies of molecular conformation and for engineering materials wherein the useful properties of two chemically distinct chains are incorporated into a single molecule. In this work we will demonstrate the extraordinary effectiveness block copolymers to both types of studies. In this dissertation work, we used peptoid diblock copolymers to identify a motif common to all bulk phase crystalline peptoid polymers. Poly N-substituted glycine materials (peptoids) have the capacity for prolific diversity due to their large library of monomers, synthetic sequence control, and monodispersity. These properties make peptoids an ideal material for the study of the relationship between chemical structure and supramolecular structure. In order to probe this relationship, we synthesized and analyzed a series of crystalline peptoid copolymers, systematically varying peptoid side-chain length (S) and main-chain length (N). In all peptoids, we found that the three unit cell dimensions - a, b, and c - are simple linear functions of S and N. These relationships indicate that the molecules adopt extended, planar conformations. This new structural motif can be used to design broad classes of assemblies which have specific unit cell sizes, functional group densities, or aqueous monolayer thicknesses, based upon a specific backbone conformation and packing preference. Furthermore, these materials ordered well enough in water to achieve the first 2 Å level transmission electron microscopy of a synthetic polymer. In the second study, we used block copolymers to impart two properties in a material effective for the pervaporation – a separation consisting of permeation and evaporation – of aqueous volatile organic compounds (VOCs). We performed this separation using a microphase separated polystyrene-block-polydimethylsiloxane-block-polystyrene (SDS) copolymer membrane. The PDMS domains are rubbery and have good permeation properties for volatile organic compounds (VOCs). The PS domains are glassy and provide the membrane with structural integrity. We find that using SDS block copolymer membranes is effective for the removal of inhibitors from lignocellulosic dilute-acid hydrolysate. Furthermore, the pervaporation-treated hydrolysates are suitable for ethanol fermentation with Saccharomyces cerevisiae . These results indicate that block copolymer-based pervaporation is a viable approach for hydrolysate detoxification in an industrial bioethanol production process. Taken together, these studies demonstrate that block copolymers are an effective tool with which to implement both fundamental molecular engineering studies and chemical engineering design.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Design Synthesis Characterization and Processing of Liquid Crystalline Diblock Copolymers written by Guoping Mao and published by . This book was released on 1997 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Main Chain Liquid Crystalline Block Copolymers written by Murty V. Bhamidipati and published by . This book was released on 1994 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Engineering of Side chain Liquid Crystalline Brush Copolymers for Photonic and Nanoporous Membrane Applications written by and published by . This book was released on 2013 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solution and Surface Properties of Architecturally and Compositionally Complex Block Copolymers and Their Binary Mixtures written by Jesse Lawrence Davis and published by . This book was released on 2015 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spontaneous generation of complex structures from polymeric building blocks provides a simple yet effective route to create useful soft matter structures having potential application in a variety of nanotechnologies. The topology, chemical structure, block composition, and sequence of the constituent building blocks of polymers are tunable through synthetic chemistry. This tunability offers attractive opportunities to generate complex, yet well-defined structures with control over the geometry, packing symmetry, and microdomain structure. This thesis work involves the study of the self-assembly behaviors of architecturally complex amphiphilic block copolymers (ABCs). ABCs are composed of two or more chemically distinct blocks that are covalently bonded together. Because of the thermodynamic incompatibility between the blocks, they self-organize through microphase separation. Systems studied include multiblock linear copolymers, star-like copolymers and graft copolymers. The self-assembly behaviors of polystyrene-poly(2-vinylpyridine) (PS-PVP) block copolymers have been systematically investigated in solution and in thin films. Binary mixtures containing linear diblock and triblock copolymers of different block lengths and star block copolymers having different numbers of constituent arms and composition were also investigated. In general, the ensembles that consist of monomodal PS-PVP block copolymers exhibit simple nanoparticle-like structures. In contrast, binary mixtures of PS-PVP block copolymers with different component architectures produce a wider variety of micellar aggregates, including particle-like, worm-like and hierarchical structures, owing to the complex architecture-induced diversity of microphase segregation behaviors in the mixed systems. In addition to studies of copolymer mixtures, the links between sequence, and composition on the self-assembly properties of a series of PLA-PEG containing bottlebrush copolymers were investigated in solution. It is found that the composition and sequence of the side-chains dictated the stability, thermodynamics, and size of micelle formation. These studies clarify the self-assembly properties of ABCs and provide new insights into how micellar structures can be controlled by tuning macromolecular architecture, sequence, and polymer composition, as well as, in the case of mixtures, blend ratio. This work is expected to be valuable for understanding the self-assembly of complex copolymeric systems, which may find use in a variety of applications ranging from personalized medicine to environmental remediation, and lays the groundwork for self-assembly processing.
