Download or read book A Stability Analysis of Polymerization Fronts written by Donna M. G. Comissiong and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Frontal Polymerization (FP) is a process of converting monomer into polymer via a localized zone that propagates through the monomer. It bears a strong resemblance to self-propagating high-temperature synthesis (SHS), which uses combustion waves to synthesize desired inorganic materials. The reaction front propagates through the coupling of thermal diffusion and the Arrhenius reaction kinetics of the exothermic polymerization process. This thesis utilizes a moving free-boundary model to describe free-radical FP. The focus of attention here is the self-sustaining wave which travels through the reaction vessel as polymer molecules are being formed. Numerical and analytical techniques are used to determine one-dimensional traveling waves, and stability analysis (linear and weakly nonlinear) of the reaction front is performed. It is then possible to suggest ways to curb instabilities in the propagating reaction front. After our initial analysis, we account for autoacceleration and determine its effect on frontal stability. In an effort to facilitate the propagation of weakly exothermic fronts, we consider a one-dimensional polymerization wave in a sandwich-type two-layer setting. First one layer is reactive while the other is considered to be inert. Heat exchange between layers is possible, and the effect this has on frontal stability is investigated. Next, we allow both layers to be reactive, thus further enhancing inter-layer heat exchange. We comment on the effect that the second reactive layer has on the basic state of the system. Finally, two future research directions are presented in detail. One of our goals is to determine how the propagating front is affected by bulk polymerization at the far end of the reaction vessel. This is an important aspect to be studied in greater depth and incorporated into existing FP models, since bulk reactions can influence the speed and long-term stability of the reaction front. We end with a theoretical discussion for the manufacture of polymer-dispersed liquid crystal films via FP.

Download or read book Nonlinear Dynamics with Polymers written by John A. Pojman and published by John Wiley & Sons. This book was released on 2011-03-16 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Closing a gap in the literature, this is the first comprehensive handbook on this modern and important polymer topic. Edited by highly experienced and top scientists in the field, this ready reference covers all aspects, including material science, biopolymers, gels, phase separating systems, frontal polymerization and much more. The introductory chapter offers the perfect starting point for the non-expert.

Download or read book An Introduction to Nonlinear Chemical Dynamics written by Irving R. Epstein and published by Oxford University Press. This book was released on 1998-10-22 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: Assuming no more than an undergraduate knowledge of chemistry, the authors take the reader through the necessary mathematical and theoretical background of oscillating reactions, chaos and chemical waves to advanced topics of current research interest in chemical systems.

Download or read book Polymer Science A Comprehensive Reference written by and published by Newnes. This book was released on 2012-12-05 with total page 7752 pages. Available in PDF, EPUB and Kindle. Book excerpt: The progress in polymer science is revealed in the chapters of Polymer Science: A Comprehensive Reference, Ten Volume Set. In Volume 1, this is reflected in the improved understanding of the properties of polymers in solution, in bulk and in confined situations such as in thin films. Volume 2 addresses new characterization techniques, such as high resolution optical microscopy, scanning probe microscopy and other procedures for surface and interface characterization. Volume 3 presents the great progress achieved in precise synthetic polymerization techniques for vinyl monomers to control macromolecular architecture: the development of metallocene and post-metallocene catalysis for olefin polymerization, new ionic polymerization procedures, and atom transfer radical polymerization, nitroxide mediated polymerization, and reversible addition-fragmentation chain transfer systems as the most often used controlled/living radical polymerization methods. Volume 4 is devoted to kinetics, mechanisms and applications of ring opening polymerization of heterocyclic monomers and cycloolefins (ROMP), as well as to various less common polymerization techniques. Polycondensation and non-chain polymerizations, including dendrimer synthesis and various "click" procedures, are covered in Volume 5. Volume 6 focuses on several aspects of controlled macromolecular architectures and soft nano-objects including hybrids and bioconjugates. Many of the achievements would have not been possible without new characterization techniques like AFM that allowed direct imaging of single molecules and nano-objects with a precision available only recently. An entirely new aspect in polymer science is based on the combination of bottom-up methods such as polymer synthesis and molecularly programmed self-assembly with top-down structuring such as lithography and surface templating, as presented in Volume 7. It encompasses polymer and nanoparticle assembly in bulk and under confined conditions or influenced by an external field, including thin films, inorganic-organic hybrids, or nanofibers. Volume 8 expands these concepts focusing on applications in advanced technologies, e.g. in electronic industry and centers on combination with top down approach and functional properties like conductivity. Another type of functionality that is of rapidly increasing importance in polymer science is introduced in volume 9. It deals with various aspects of polymers in biology and medicine, including the response of living cells and tissue to the contact with biofunctional particles and surfaces. The last volume is devoted to the scope and potential provided by environmentally benign and green polymers, as well as energy-related polymers. They discuss new technologies needed for a sustainable economy in our world of limited resources. Provides broad and in-depth coverage of all aspects of polymer science from synthesis/polymerization, properties, and characterization methods and techniques to nanostructures, sustainability and energy, and biomedical uses of polymers Provides a definitive source for those entering or researching in this area by integrating the multidisciplinary aspects of the science into one unique, up-to-date reference work Electronic version has complete cross-referencing and multi-media components Volume editors are world experts in their field (including a Nobel Prize winner)

Download or read book Mathematical Analysis of Two Monomer Systems of Frontal Polymerization written by Michael F. Perry and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Frontal polymerization is a technique for converting monomer into polymer via a self-propagating reaction wave. Polymers can be manufactured by using one or more monomers; however, polymers formed with two or more monomers are advantageous because the polymer can assume specific important qualities. In this thesis, mathematical models for free-radical binary frontal polymerization and free-radical frontal copolymerization, methods in which polymers are formed using two different monomers, are developed. Through simplifying assumptions, the equations are solved both analytically and numerically, and important characteristics of the process, such as the propagation speed of the wave, the final temperature in the reaction front, and the final monomer concentrations, are studied. The analytic solution is compared to the numerical solution and to experimental results, whenever possible, to demonstrate agreement between the results. Parameters of the reaction are examined to determine which ones most influence the aforementioned characteristics. Stability of the polymerization front is also investigated.

Download or read book Self Assembly Pattern Formation and Growth Phenomena in Nano Systems written by Alexander A. Golovin and published by Springer Science & Business Media. This book was released on 2006-01-14 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nano-science and nano-technology are rapidly developing scientific and technological areas that deal with physical, chemical and biological processes that occur on nano-meter scale – one millionth of a millimeter. Self-organization and pattern formation play crucial role on nano-scales and promise new, effective routes to control various nano-scales processes. This book contains lecture notes written by the lecturers of the NATO Advanced Study Institute "Self-Assembly, Pattern Formation and Growth Phenomena in Nano-Systems" that took place in St Etienne de Tinee, France, in the fall 2004. They give examples of self-organization phenomena on micro- and nano-scale as well as examples of the interplay between phenomena on nano- and macro-scales leading to complex behavior in various physical, chemical and biological systems. They discuss such fascinating nano-scale self-organization phenomena as self-assembly of quantum dots in thin solid films, pattern formation in liquid crystals caused by light, self-organization of micro-tubules and molecular motors, as well as basic physical and chemical phenomena that lead to self-assembly of the most important molecule on the basis of which most of living organisms are built – DNA. A review of general features of all pattern forming systems is also given. The authors of these lecture notes are the leading experts in the field of self-organization, pattern formation and nonlinear dynamics in non-equilibrium, complex systems.

Download or read book A Local Stability Analysis for a Polymerization Reactor written by Alan Michael Kugelman and published by . This book was released on 1966 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nonlinear Dynamics in Polymeric Systems written by John Anthony Pojman and published by . This book was released on 2004 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses nonlinear dynamics in polymeric systems with a special emphasis on systems of potential utility, including gels, fronts, phase separation, interfacial phenomena, and oscillating reactions.

Download or read book Self Assembly Pattern Formation and Growth Phenomena in Nano Systems written by and published by Springer Science & Business Media. This book was released on 2006 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Propagating Polymerization Fronts written by and published by . This book was released on 1997 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have determined the factors that affect front velocity, conversion and molecular in frontal polymerization with liquid monomers and made some progress with solid monomer systems. We developed the first binary system, consisting of acrylate polymerization via a free-radical mechanism and the curing of an epoxy resin. A full IPN is produced. We also prepared the first frontal polymer dispersed liquid crystal (PDLC) material. We developed a method to suppress convective instabilities via tube rotation and have determined the critical conditions affecting ascending front stability with respect to natural convection. We have studied the frontal curing of DEGEBA epoxy resin. We developed new method to prepare functionally gradient materials.

Download or read book Numerical Methods for Fluid Dynamics V written by K. W. Morton and published by Oxford University Press. This book was released on 1995 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of an international conference on Numerical Methods for Fluid Dynamics held at the University of Oxford in April 1995. It provides a summary of recent research on the computational aspects of fluid dynamics. It includes contributions from many distinguished mathematicians and engineers and, as always, the standard of papers is high. The main themes of the book are algorithms and algorithmic needs arising from applications, Navier-Stokes on flexible grids, and environmental computational fluid dynamics. Graduate students of numerical analysis will find the up-to-date coverage of research in this book very useful.

Download or read book Parallel Computational Fluid Dynamics 95 written by A. Ecer and published by Elsevier. This book was released on 1996-01-25 with total page 749 pages. Available in PDF, EPUB and Kindle. Book excerpt: Parallel Computational Fluid Dynamics(CFD) is an internationally recognised fast-growing field. Since 1989, the number of participants attending Parallel CFD Conferences has doubled. In order to keep track of current global developments, the Parallel CFD Conference annually brings scientists together to discuss and report results on the utilization of parallel computing as a practical computational tool for solving complex fluid dynamic problems. This volume contains the results of research conducted during the past year. Subject areas covered include: novel parallel algorithms, parallel Euler and Navier-Stokes solvers, parallel Direct Simulation Monte Carlo method and parallel multigrid techniques. The content of the book also demonstrates that considerable effort is being made to utilize parallel computing to solve a variety of fluid dynamics problems in topics such as climate modeling, consultation, aerodynamics and in many other areas. Readers of this book will gain a valid insight into the exciting recent developments in Parallel CFD research.

Download or read book Without Bounds A Scientific Canvas of Nonlinearity and Complex Dynamics written by Ramon G. Rubio and published by Springer. This book was released on 2013-05-30 with total page 781 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bringing together over fifty contributions on all aspects of nonlinear and complex dynamics, this impressive topical collection is both a scientific and personal tribute, on the occasion of his 70th birthday, by many outstanding colleagues in the broad fields of research pursued by Prof. Manuel G Velarde. The topics selected reflect the research areas covered by the famous Instituto Pluridisciplinar at the Universidad Complutense of Madrid, which he co-founded over two decades ago, and include: fluid physics and related nonlinear phenomena at interfaces and in other geometries, wetting and spreading dynamics, geophysical and astrophysical flows, and novel aspects of electronic transport in anharmonic lattices, as well as topics in neurodynamics and robotics.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2005 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chemomechanical Instabilities in Responsive Materials written by Pierre Borckmans and published by Springer Science & Business Media. This book was released on 2009-08-13 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present volume includes most of the material of the invited lectures delivered at the NATO Advanced Study Institute “Morphogenesis through the interplay of nonlinear chemical instabilities and elastic active media” held from 2th to 14th July 2007 at the Institut d’Etudes Scientifiques de Cargèse (http://www.iesc.univ-corse.fr/), in Corsica (France). This traditional place to organize Summer Schools and Workshops in a well equipped secluded location at the border of the Mediterranean sea has, over many years now, earned an increasing deserved reputation. Non-linear dynamics of non equilibrium systems has worked its way into a great number of fields and plays a key role in the understanding of se- organization and emergence phenomena in domains as diverse as chemical reactors, laser physics, fluid dynamics, electronic devices and biological morphogenesis. In the latter case, the viscoelastic properties of tissues are also known to play a key role. The control and formulation of soft responsive or “smart” materials has been a fast growing field of material science, specially in the area of po- mer networks, due to their growing applications in bio-science, chemical sensors, intelligent microfluidic devices, ... . Nature is an important p- vider of active materials whether at the level of tissues or at that of s- cellular structures. As a consequence, the fundamental understanding of the physical mechanisms at play in responsive materials also shines light in the understanding of biological artefacts.

Download or read book Stability Analysis of Polymer Brushes written by Christopher Roderick and published by . This book was released on 2005 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The term polymer brush refers to the class of structures formed by polymers when attached to a surface at sufficiently high surface density so as to cause the polymers to stretch away from the surface to avoid each other. Considering specifically brushes formed by flexible, linear homopolymers attached by a single end to an impenetrable planar surface, this thesis investigates the stability of the laterally homogeneous phase of the brush in response to fluctuations of polymer density. The controlling factors studied are: the energetic interactions of the polymers with the bath of solvent particles in which the brush is immersed; the excluded volume of the polymers, which results from the mutual repulsion that exists between any two polymer segments; and the polymeric content in the brush, controlled by the grafting density and the length of the polymers. It is found that the stability of the laterally homogeneous phase of the brush is enhanced by increasing the polymer excluded volume, the polymeric content in the brush, or both. When incompressibility is modeled at the mean field level, it is found that there exists a region of parameter space in which the laterally homogeneous phase is stable for all values of the polymer-solvent interaction." --

Download or read book Self Propagating High Temperature Synthesis of Materials written by Anatoli A. Borisov and published by CRC Press. This book was released on 2002-07-18 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Self-Propagating High-Temperature Synthesis of Materials is a collection of papers that reflects modern trends in self-propagating, high-temperature synthesis (SHS), a process for synthesis of modern materials carried out in the mode of autowave solid-flame combustion. To date, SHS-produced materials have found their application in different branches of modern science and technology, mechanical engineering, ferrous and nonferrous metallurgy, aerospace engineering, chemical industry, electrical engineering, and electronics. This book is useful not only for the SHS community, but also for researchers and engineers who are active in the following related fields of knowledge; theory and practice of combustion, materials science and technology, pure and applied chemistry, and metallurgy.