Download or read book Microstructure Dynamics and Applications of Solvated Block Copolymers written by Lin Yang and published by . This book was released on 2000 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Block Copolymers in Solution written by Ian W. Hamley and published by John Wiley & Sons. This book was released on 2005-09-02 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique text discusses the solution self-assembly of block copolymers and covers all aspects from basic physical chemistry to applications in soft nanotechnology. Recent advances have enabled the preparation of new materials with novel self-assembling structures, functionality and responsiveness and there have also been concomitant advances in theory and modelling. The present text covers the principles of self-assembly in both dilute and concentrated solution, for example micellization and mesophase formation, etc., in chapters 2 and 3 respectively. Chapter 4 covers polyelectrolyte block copolymers - these materials are attracting significant attention from researchers and a solid basis for understanding their physical chemistry is emerging, and this is discussed. The next chapter discusses adsorption of block copolymers from solution at liquid and solid interfaces. The concluding chapter presents a discussion of selected applications, focussing on several important new concepts. The book is aimed at researchers in polymer science as well as industrial scientists involved in the polymer and coatings industries. It will also be of interest to scientists working in soft matter self-assembly and self-organizing polymers.

Download or read book Block Copolymer Dynamics and Microstructure written by Ziwei Liu and published by . This book was released on 1996 with total page 406 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 Developments in Block Copolymer Science and Technology written by Ian W. Hamley and published by John Wiley & Sons. This book was released on 2004-03-05 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focuses on recent advances in research on block copolymers, covering chemistry (synthesis), physics (phase behaviors, rheology, modeling), and applications (melts and solutions). Written by a team of internationally respected scientists from industry and academia, this text compiles and reviews the expanse of research that has taken place over the last five years into one accessible resource. Ian Hamley is the world-leading scientist in the field of block copolymer research Presents the recent advances in the area, covering chemistry, physics and applications. Provides a broad coverage from synthesis to fundamental physics through to applications Examines the potential of block copolymers in nanotechnology as self-assembling soft materials

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 Microstructure of Block Copolymers in the Presence of Selective Solvents written by Paschalis Alexandridis and published by . This book was released on 1998 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electrical and Optical Polymer Systems written by Donald L. Wise and published by CRC Press. This book was released on 1998-03-27 with total page 1256 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Offers background information, methods of characterization, and applications for electrical and optical polymers, including biopolymers, and tutorial sections that explain how to use the techniques."

Download or read book The Microstructure of Block Copolymer Amphiphiles Near Material Surfaces written by Mohan Sikka and published by . This book was released on 1994 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structure and Dynamic Properties of Interfacially Modified Block Copolymers from Molecular Dynamics Simulations written by Youngmi Seo and published by . This book was released on 2017 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured diblock copolymers, in which one can take advantage of the different properties of two types of monomers, are of interest in transport applications such as battery electrolytes. One can modify structural properties of diblock copolymers by inserting a midblock with a different composition between the two pure blocks. We study linearly tapered block polymers (TBPs) which are AB diblock copolymers modified by adding a linear gradient region (taper) between the blocks in which composition varies from one species to the other. This gives an additional tuning parameter, the length of the taper, to control the microphase separation behavior, e.g. increased accessibility of the bicontinuous double gyroid phase, or dynamic properties potentially of interest in transport applications. Here, we use molecular dynamics (MD) simulations to investigate both the structural and dynamic properties of TBPs and related block polymer systems. The MD results are consistent with the theoretical results in which the double gyroid network structure is more accessible with a taper and both the effective segregation strength and domain spacing decrease. Interestingly, the inverse TBPs, which have the B-side of the taper bonded to the pure A block, have a significantly shorter domain spacing compared to the normal TBPs. This is related to the polymer conformations; in contrast to typical diblocks or normal TBPs, inverse tapered chains can exist in several distinct conformations. For instance, inverse tapered chains may fold back and forth across the interface, bridge between multiple domains, or stretch over two layers of lamellae depending on the taper length. This conformational behavior was quantitatively analyzed as a function of the taper length. Theoretical work had predicted that the 50% inverse TBPs have a unique phase diagram; the larger of the two pure end blocks can phase separate into double gyroid phases. The MD results also show such a double gyroid structure for the 50% inverse TBPs. To understand the potential impact of tapers on ion dynamics, we investigated the diffusion of a small amount of penetrants in both normal and inverse TBPs. We considered uncharged monomer-sized penetrants, which have favorable interactions with A monomers of a strength that is chosen to make an analogy with the solvation of ions in the higher dielectric microphase of certain experimentally relevant copolymers. With normal tapering, both polymer and penetrant diffusion parallel to the lamellae increases as taper length increases, but inverse tapers show a non-monotonic variation in polymer diffusion. This is explained by analyzing differences in dynamic behavior between inverse tapered polymers with different types of conformations. However, regardless of the type of the midblocks, the penetrants’ diffusion constant values generally collapsed on a single curve when plotted against blockiness (average block length as a fraction of chain length) or number of A-B bonds per chain which can represent the degree of local A-B mixing. This implies that the local A-B mixing of monomers (rather than polymer conformation) is the most important factor in determining penetrant diffusion. These insights may allow improved design of nanostructured membranes for small molecule transport.

Download or read book Amphiphilic Block Copolymers written by Björn Lindman and published by Elsevier Science Limited. This book was released on 2000 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is the belief of the editors of this book that the recognition of block copolymers as being amphiphilic molecules and sharing common features with other well-studied amphiphiles will prove beneficial to both the surfactant and the polymer communities. An aim of this book is to bridge the two communities and cross-fertilise the different fields. To this end, leading researchers in the field of amphiphilic block copolymer self-assembly, some having a background in surfactant chemistry, and others with polymer physics roots, have agreed to join forces and contribute to this book. The book consists of four entities. The first part discusses theoretical considerations behind the block copolymer self-assembly in solution and in the melt. The second part provides case studies of self-assembly in different classes of block copolymers (e.g., polyethers, polyelectrolytes) and in different environments (e.g., in water, in non-aqueous solvents, or in the absence of solvents). The third part presents experimental tools, ranging from static (e.g., small angle neutron scattering) to dynamic (e.g., rheology), which can prove valuable in the characterization of block copolymer self-assemblies. The fourth part offers a sampling of current applications of block copolymers in, e.g., formulations, pharmaceutics, and separations, applications which are based on the unique self-assembly properties of block copolymers.

Download or read book Controlling the Microstructure and Kinetics of Block Copolymer Self assembly by Direct Immersion Annealing written by Melanie J. Longanecker and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The self-assembly of block copolymers into periodic nanostructures has long been studied for their potential use in integrated circuits, nanofiltration devices, metamaterials, energy and data storage devices, and many more applications. Their use, however, is limited by a number of structural and kinetics challenges. The present research describes how a recently developed annealing technique, direct immersion annealing, can be used to address these challenges. The mechanism that leads to a change in domain size of up to 64% for a single molecular weight during direct immersion annealing is examined for one, two, and three-dimensional morphologies. It was found that the chain orientation within a structure has a significant impact on the structural rearrangements that occur as the result of constrained swelling. This leads to a reduction of the domain size for out-of-plane structure and an increase in domain size for in-plane structure. The non-equilibrium state of the morphology that leads to the reduced domain size leaves the chains in a non-equilibrium conformation that deviates from the tear-drop shape traditionally observed in block copolymers. SANS analysis confirms that the chains take on a flattened disc-like shape in this state. The solvent presence during direct immersion annealing also presents the ability to tune the interaction parameter of the block, where it is shown that the diffuse interface between domains can be improved by 27% using a selective solvent. The kinetics of direct immersion annealing are examined for its ability to order neat and filled block copolymer systems in rapid times. It was found that direct immersion annealing can order much faster than solvent vapor annealing due to the difference in chemical potential of bulk solvent vs. vapors. This has a significant impact on the film swelling rate, where a film submerged in bulk solvent during direct immersion annealing swells to its equilibrium thickness instantaneously, while the vapor annealed film had still not reached equilibrium after 4 h. Further, it was determined that the rapid ordering kinetics of direct immersion annealing are limited to the molecular weight regime where chains are unentangled. At higher molecular weights, the ordering diffusion coefficient scales as N-2.9.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Directory of Graduate Research written by and published by . This book was released on 2001 with total page 1846 pages. Available in PDF, EPUB and Kindle. Book excerpt: Faculties, publications and doctoral theses in departments or divisions of chemistry, chemical engineering, biochemistry and pharmaceutical and/or medicinal chemistry at universities in the United States and Canada.

Download or read book American Doctoral Dissertations written by and published by . This book was released on 2000 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Time dependent Morphologies and Viscoelastic Properties of Block Copolymers written by Jeffrey Carl Kelterborn and published by . This book was released on 1981 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic mechanical properties of block copolymers over a wide temperature range have been previously correlated with the phase-separated microstructure of these systems. In the present work the morphology of the block copolymer is altered by large tensile deformation at various temperatures. Upon removal of the applied stress the morphological features of such stretched-and-released systems become functions of time, as the non-equilibrium microstructure reverts to a thermodynamically stable state. This reformation process is monitored by dynamic mechanical measurements with a modified torsion pendulum capable of applying both tensile and torsional deformation. Experimental results are analyzed using a modified Nielsen model to obtain information on the time-dependent structural state of the samples. These results are then compared with stress-strain curves to provide further insight into the structure breakdown-reformation mechanisms. Two competing mechanisms, domain fracture and block pull out, are proposed to explain these experimental observations. (Author).