Download or read book Phase Separation and Morphology of Diblock and Segmented Block Copolymers written by David A. Gobran and published by . This book was released on 1990 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 The Effects of Segmental Incompatibility and the Degree of Phase Separation on the Morphology and Properties of Polyurethane Block Copolymers written by Thomas Arthur Speckhard and published by . This book was released on 1985 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Morphology and Properties of Segmented Copolymers and Blends written by Carl Baa-sun Wang and published by . This book was released on 1982 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis of Side Chain Liquid Crystal Polymers by Living Ring Opening Metathesis Polymerization 4 Synthesis of Amorphous and Side Chain Liquid Crystal AB Block Copolymers written by and published by . This book was released on 1992 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diblock copolymers with well defined block length yield ordered phase separation. Morphology of the microphase separation is controllable by varying the weight ratio of the two blocks and the length of each block. If one of the blocks is a side chain liquid crystalline polymer (SCLCP), microphase separated systems with liquid crystalline microphases may be realized. Such systems are of fundamental as well as practical interest. The effect of size and type of the liquid crystalline microphase transition is one of the fundamental questions. This effect is recently investigated by the polymer system in which low molecular weight liquid crystals are dispersed. Different from the low molecular weight liquid crystals dispersed systems, the block copolymer can give several types of microdomains (lamellae, cylinders, or spheres).
Download or read book Developments in Block Copolymers written by and published by . This book was released on 1985 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Molecular Study of the Structure and Morphology of Diblock Copolymers on Nano patterened Substrates written by Quiang Wang and published by . This book was released on 2002 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Block Copolymers written by Ashish Kumar Khandpur and published by . This book was released on 1995 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Morphology of a Phase Separated and a Molecular Composite 30 PBT 70 ABPBI Block Copolymer written by W. W. Adams and published by . This book was released on 1987 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: The morphology of a triblock copolymer of rigid-rod poly(p-phenylene benzobisthiazole (PBT) and semi-flexible coil poly (2,3(6)benzimidazole) (ABPBI) was examined by wide angle x-ray scattering and scanning and transmission electron microscopy. When samples were vacuum cast from a solution where the amount of 30% PBT/70% ABPBI copolymer was greater than a critical concentration of 5.8%, large-scale phase separation occurred and a film formed containing 0.1- micron particles and platelets in a ductile matrix. The particles and platelets were composed of well-oriented 10-nm PBT crystallites, while the matrix material was chiefly composed of ABPBI. When the amount of 30%PBT/70% ABPBI copolymer in a solvent was less than the critical concentration, the solution into a water coagulating bath had large scale phase separation inhibited.
Download or read book Tuning Melt phase Morphology in Block Copolymers Using Block Dispersity written by and published by . This book was released on 2014 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block copolymers non-linearly combine the properties of two different homopolymers into a single material, by virtue of the connectivity between the two distinct homopolymer segments. Their microphase separation at the nanoscale leads to the formation of interesting and useful microstructures, such as spheres and cylinders ordered on regular lattices with high degrees of long-range order. The advent of newer controlled radical and tandem polymerization techniques enables the enchainment of an ever increasing number of functional monomers with new properties, yet these techniques typically result in copolymers with broader molecular weight dispersities. A thorough understanding of the morphological consequences of increased molecular weight dispersity in one or more segments in a block copolymer will enable the development of new materials incorporating unusual monomers with new chemical functionalities and properties. Herein, we describe the synthesis and characterization of a library of poly(lactide-b-1,4-butadiene-b-lactide) (LBL) triblock copolymer samples with broad dispersity center segments, and we compare their melt-phase self-assembly behavior to previously reported polydisperse SBS triblock copolymers. Based on these comparisons, we rationalize the dramatically different behaviors of the two systems in terms of specific chain packing arrangements that depend upon the degree of chemical incompatibility of the copolymer system. In an attempt to mimic the most important molecular heterogeneities of continuously polydisperse copolymers as identified by our studies, we designed bidisperse blends of triblock copolymers and studied their morphological and uniaxial mechanical properties. As with continuously polydisperse copolymers, these blends also adopted bicontinuous morphologies with substantial mechanical toughness. In the latter part of this thesis, we investigate the influence of macromolecular dispersity on the macrophase separation behavior of mixtures of poly(vinyl alcohol) (PVA) and poly(ethylene oxide) (PEO) co-dissolved in water. The location of the concentration-dependent phase boundary, which separates the phase separated and phase mixed regions, is shown to depend on both the average molecular weight and dispersity of the polymeric components. Colloidal and copolymer surfactant additives are further shown to improve ATPS emulsion stability at higher temperatures and to mitigate emulsion coarsening.
Download or read book Technical Proceedings of the 2007 Cleantech Conference and Trade Show written by NanoScience & Technology Inst and published by CRC Press. This book was released on 2019-08-22 with total page 699 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Cleantech conference, which runs parallel with NSTI's Nanotech, is designed to promote advancements in traditional technologies, emerging technologies, and clean business practices, covering important developments in renewable energy, clean technologies, business and policy, bio-energy, and novel technologies, as well as environme
Download or read book Morphology of Segmented Polyurethanes as Probed by Electron Microscopy Small angle X ray Scattering and Gas Transport Measurement written by Chi Li and published by . This book was released on 1988 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 600 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
Download or read book Segmented Copolymers written by Amnuey Lilaonitkul and published by . This book was released on 1978 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Block Copolymers written by Ryan H. Diaz and published by Nova Science Publishers. This book was released on 2014-05-14 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block copolymers constitute a fascinating group of polymeric materials belonging to the ""soft matter"" family. These materials are formed by blocks of polymeric chains from different monomers. In most cases, these blocks are thermodynamically incompatible, but the covalent bonds between them impose specific arrangements, generating particular morphologies both in bulk and in solution. In this book, the authors present current research in the study of the phase morphology, material applications and future challenges of block copolymers. Topics discussed include the different experimental skill.
Download or read book Controlling Morphology of Multi component Block Copolymer Based Materials written by Rafal Adam Mickiewicz and published by . This book was released on 2009 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability of block copolymers to self-assemble into ordered microstructures has attracted much interest both from a pure scientific perspective and for their potential in numerous industrial applications. The microphase separation of block copolymers has been successfully exploited in a wide range of applications, such as templating and lithography, enhancement of mechanical properties, and nano reactor schemes. This thesis focuses on the characterization of the morphology in composite systems where one or more of the components is a block copolymer. In the first part of this thesis, binary blends of very high molecular weight diblock copolymers with a low molecular weight triblock copolymer are investigated. The high molecular weight diblock copolymers are very strongly segregating, with interaction parameter values, XN, in the range 470 - 1410. The phase diagram revealed a large miscibility gap for the blends, with macrophase separation into two distinct types of microphase separated domains and implied virtually no solubility of the much higher molecular weight diblocks in the triblock. For certain blend compositions, morphological transitions from the lamellar to cylindrical and bicontinuous structures were also observed, even though the overall composition in the blend would be expected to favor the lamellar microstructure. This was found to result from the compositional asymmetry of the triblock copolymer influencing the curvature of the inter-material dividing surface (IMDS). Finally, a strong segregation theory model was used to interpret the observed results. In the second part of this thesis the microstructure formation in nanocomposites based on a liquid crystalline side chain block copolymer (LCBCP) and gold nanoparticles was investigated. The location of the nanoparticles was found to not only depend on the surface chemistry of the gold nanoparticles, but also on the self-organization within the liquid crystalline domain of the LCBCP. The nanoparticles were excluded from the liquid crystalline domains due to the high free energy penalty of disrupting the smectic layering. The final location of the nanoparticles within the composite was determined by the nature of the stabilizing surface coating. The work presented in this thesis revealed a number of interesting tools which are useful for obtaining a wide range of morphologies in multi-component block copolymer systems.
