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Phase Transitions in Polymers: The Role of Metastable States

Phase Transitions in Polymers: The Role of Metastable States
A Book

by Stephen Z.D. Cheng

  • Publisher : Elsevier
  • Release : 2008-09-10
  • Pages : 324
  • ISBN : 9780080558202
  • Language : En, Es, Fr & De
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A classical metastable state possesses a local free energy minimum at infinite sizes, but not a global one. This concept is phase size independent. We have studied a number of experimental results and proposed a new concept that there exists a wide range of metastable states in polymers on different length scales where their metastability is critically determined by the phase size and dimensionality. Metastable states are also observed in phase transformations that are kinetically impeded on the pathway to thermodynamic equilibrium. This was illustrated in structural and morphological investigations of crystallization and mesophase transitions, liquid-liquid phase separation, vitrification and gel formation, as well as combinations of these transformation processes. The phase behaviours in polymers are thus dominated by interlinks of metastable states on different length scales. This concept successfully explains many experimental observations and provides a new way to connect different aspects of polymer physics. * Written by a leading scholar and industry expert * Presents new and cutting edge material encouraging innovation and future research * Connects hot topics and leading research in one concise volume

Phase Transitions in Polymers

Phase Transitions in Polymers
Proceedings

by A. J. Hopfinger,P. L. Taylor

  • Publisher : Unknown Publisher
  • Release : 1980
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Ferroelectric Polymers

Ferroelectric Polymers
A Book

by E. Fukada

  • Publisher : CRC Press
  • Release : 1989
  • Pages : 128
  • ISBN : 9780677258805
  • Language : En, Es, Fr & De
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This volume contains four papers commencing with an introduction to early studies in piezoelectricity, pyroelectricity and ferroelectricity in polymers. Other topics discussed include - ferroelectric properties of fluoride copolymers; structural phase transition in ferroelectric fluorine polymers; and pressure effect on phase transition in ferroelectric polymers .

Kinetics of Phase Transitions in Polymers

Kinetics of Phase Transitions in Polymers
A Book

by Guangdong Liao

  • Publisher : Unknown Publisher
  • Release : 1998
  • Pages : 332
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Geometry and Phase Transitions in Colloids and Polymers

Geometry and Phase Transitions in Colloids and Polymers
A Book

by William Kung

  • Publisher : World Scientific
  • Release : 2009
  • Pages : 191
  • ISBN : 9812834966
  • Language : En, Es, Fr & De
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This monograph represents an extension of the author's original PhD thesis and includes a more thorough discussion on the concepts and mathematics behind his research works on the foam model, as applied to studying issues of phase stability and elasticity for various non-closed packed structures found in fuzzy and colloidal crystals, as well as on a renormalization-group analysis regarding the critical behavior of loop polymers upon which topological constraints are imposed. The common thread behind these two research works is their demonstration of the importance and effectiveness of utilizing geometrical and topological concepts for modeling and understanding soft systems undergoing phase transitions. Book jacket.

Phase Transitions in Polymers

Phase Transitions in Polymers
International Symposium : Papers and Abstracts

by Case Western Reserve University. Materials Research Laboratory,International Union of Pure and Applied Physics,International Union of Pure and Applied Chemistry

  • Publisher : Unknown Publisher
  • Release : 2021
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Phase Transitions and Structure of Polymer Systems in External Fields

Phase Transitions and Structure of Polymer Systems in External Fields
A Book

by Sergey A. Vshivkov

  • Publisher : Cambridge Scholars Publishing
  • Release : 2019-05-14
  • Pages : 381
  • ISBN : 1527534561
  • Language : En, Es, Fr & De
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Generalized extensive experimental and theoretical data regarding the phase transitions of polymer systems in mechanical and magnetic fields provide the possibility to predict the results of external field effects on the structure and mutual solubility of components. The data on dynamic structuring in deformed polymer blends and solutions allow for the use of found regularities by the processing of polymer systems. The methods offered in this book allow for the connection of shift of phase diagrams in the mechanical field with changes in macromolecule sizes. The tutorials described here will help the reader to correctly build the phase diagrams of polymer systems using a variety of methods.

Theories and Mechanism of Phase Transitions, Heterophase Polymerizations, Homopolymerization, Addition Polymerization

Theories and Mechanism of Phase Transitions, Heterophase Polymerizations, Homopolymerization, Addition Polymerization
A Book

by Anonim

  • Publisher : Springer
  • Release : 2013-10-03
  • Pages : 309
  • ISBN : 9783662149010
  • Language : En, Es, Fr & De
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Responsive Gels: Volume Transitions 1

Responsive Gels: Volume Transitions 1
A Book

by Karel Dusek

  • Publisher : Springer
  • Release : 2013-10-03
  • Pages : 275
  • ISBN : 9783662149355
  • Language : En, Es, Fr & De
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Toyiochi Tanaka, Mitsuhiro Shibayama, "Phase Transitions and related Phenomena of Polymer Gels", Akira Onuki "Theory of Phase Transition in Polymer Gels", Alexei Khokhlov, Sergei Starodybtzev, Valentina Vasilevskaya "Conformational Transitions in Polymer Gels: Theory and Experiment", Michal Ilavsky " Effect on Phase Transition on Swellingand Mechanical Behavior of Synthetic Hydrogels", Shozaburo Saito , M. Konno, H. Inomata "Volume Phase Transition of N-Alkylacrylamide Gels", Ronald Siegel "Hydrophobic Weak Polyelectrolyte Gels: Studies of Swelling Equilibria and Kinetics".

Phase Transitions in Polymeric Systems

Phase Transitions in Polymeric Systems
A Directed Walk Study

by Gerasim K. Iliev

  • Publisher : Unknown Publisher
  • Release : 2008
  • Pages : 282
  • ISBN : 9780494580110
  • Language : En, Es, Fr & De
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In this thesis several classes of directed paths are considered as models of linear polymers in a dilute solution. We obtain the generating functions for each model by considering factorization arguments. Information about the polymer behaviour can be extracted from the singularity structure of the associated generating functions.By using modified versions of these models we study the adsorption and localization of polymer molecules, the behaviour of polymers subject to a tensile force, the effects of stiffness, as well as the behaviour of polymers in confined geometries. In each of these situations the resulting generating functions contain at least two physical singularities. We identify the phase transitions in these systems by a changeover in the dominant singularity of the generating function.In the study of localization and polymers subject to a force, we utilize both homopolymer and random copolymer models. For copolymers, the physically relevant properties are obtained by considering a quenched average of the free energy over all possible monomer sequences. This procedure is intractable even for the simplest models. By considering the Morita approximation for several walk models we obtain results which give a bound on the corresponding features of the quenched system.We use a mapping between a simple model of duplex DNA and an adsorbing Motzkin path in order to study the mechanical unzipping of duplex DNA. From this model, we obtain force-temperature diagrams which show re-entrant behaviour of the force. We also develop a simple low temperature theory to describe the behaviour of the force close to T = 0 and find that the shape of the force-temperature curve is associated with entropy in the ground state of the system.We consider the effect of stiffness on polymer adsorption and find that the phase transition is second order for all finite stiffness parameters.For systems of polymers in confined geometries, we find that the behaviour of the polymer depends on the distance between the confining surfaces and the associated interactions with each surface. In this problem, there exist regimes where the polymer exerts a force on the surfaces which can be attractive, repulsive or zero.

International Symposium on Phase Transitions in Polymers, Cleveland,Ohio 1980

International Symposium on Phase Transitions in Polymers, Cleveland,Ohio 1980
Phase Transitions in Polymers

by A.J. Hopfinger,P.L. Taylor

  • Publisher : Unknown Publisher
  • Release : 1980
  • Pages : 326
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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A Spectroscopic Study of Phase Transitions in Polymers

A Spectroscopic Study of Phase Transitions in Polymers
A Book

by Nicholas Matthew Reynolds

  • Publisher : Unknown Publisher
  • Release : 1990
  • Pages : 380
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Phase Transitions in Polymers in Combined Tension and Shear

Phase Transitions in Polymers in Combined Tension and Shear
A Book

by Mary Ann H. Fitzwater

  • Publisher : Unknown Publisher
  • Release : 1991
  • Pages : 278
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Phase Transition in Polymer Blends and Structure of Ionomers and Copolymers

Phase Transition in Polymer Blends and Structure of Ionomers and Copolymers
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 1993
  • Pages : 9
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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The main thrust of the program in the past 3 years are summarized: SAXS instrumentation development; structure and dynamics of macro- and supra-molecules, phase transitions in polymer blends and solutions, structure of ionomers, and fractals and anisotropic systems.

Phase Transitions in Bulk Polymers

Phase Transitions in Bulk Polymers
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 1977
  • Pages : 136
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Morphological Implications of Phase Transitions in Polymer Solutions

Morphological Implications of Phase Transitions in Polymer Solutions
Inferences from Polyacrylonitrile-based Solutions

by Rashi Akki

  • Publisher : Unknown Publisher
  • Release : 1995
  • Pages : 412
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Phase Transitions in Polymers

Phase Transitions in Polymers
International Symposium, Held in Cleveland, on June 11-13, 1980

by A. J. Hopfinger,P. L. Taylor

  • Publisher : Unknown Publisher
  • Release : 1980
  • Pages : 326
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Phase Transition Dynamics

Phase Transition Dynamics
A Book

by Akira Onuki

  • Publisher : Cambridge University Press
  • Release : 2002-06-06
  • Pages : 714
  • ISBN : 9781139433167
  • Language : En, Es, Fr & De
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Phase transition dynamics is centrally important to condensed matter physics. This 2002 book treats a wide variety of topics systematically by constructing time-dependent Ginzburg-Landau models for various systems in physics, metallurgy and polymer science. Beginning with a summary of advanced statistical-mechanical theories including the renormalization group theory, the book reviews dynamical theories, and covers the kinetics of phase ordering, spinodal decomposition and nucleation in depth. The phase transition dynamics of real systems are discussed, treating interdisciplinary problems in a unified manner. Topics include supercritical fluid dynamics, stress-diffusion coupling in polymers and mesoscopic dynamics at structural phase transitions in solids. Theoretical and experimental approaches to shear flow problems in fluids are reviewed. Phase Transition Dynamics provides a comprehensive account, building on the statistical mechanics of phase transitions covered in many introductory textbooks. It will be essential reading for researchers and advanced graduate students in physics, chemistry, metallurgy and polymer science.

Dynamic Light Scattering Studies of Phase Transitions in Polymers and Gels

Dynamic Light Scattering Studies of Phase Transitions in Polymers and Gels
A Book

by Michal Jan P. Orkisz

  • Publisher : Unknown Publisher
  • Release : 1994
  • Pages : 109
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Phase Diagrams and Kinetics of Solid-liquid Phase Transitions in Crystalline Polymer Blends

Phase Diagrams and Kinetics of Solid-liquid Phase Transitions in Crystalline Polymer Blends
A Book

by Rushikesh A. Matkar

  • Publisher : Unknown Publisher
  • Release : 2007
  • Pages : 217
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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"A free energy functional has been formulated based on an order parameter approach to describe the competition between liquid-liquid phase separation and solid-liquid phase separation. In the free energy description, the assumption of complete solvent rejection from the crystalline phase that is inherent in the Flory diluent theory was removed as solvent has been found to reside in the crystalline phase in the form of intercalates. Using this approach, we have calculated various phase diagrams in binary blends of crystalline and amorphous polymers that show upper or lower critical solution temperature. Also, the discrepancy in the X values obtained from different experimental methods reported in the literature for the polymer blend of poly(vinylidenefluoride) and poly(methylmethacrylate) has been discussed in the context of the present model. Experimental phase diagram for the polymer blend of poly(caprolactone) and polystyrene has also been calculated. Of particular importance is that the crystalline phase concentration as a function of temperature has been calculated using free energy minimization methods instead of assuming it to be pure. In the limit of complete immiscibility of the solvent in the crystalline phase, the Flory diluent theory is recovered. The model is extended to binary crystalline blends and the formation of eutectric, peritectic and azeotrope phase diagrams has been explained on the basis of departure from ideal solid solution behavior. Experimental eutectic phase diagram from literature of a binary blend of crystalline polymer poly(caprolactone) and trioxane were recalculated using the aforementioned approach. Furthermore, simulations on the spatio temporal dynamics of crystallization in blends of crystalline and amorphous polymers were carried out using the Ginzburg-Landau approach. These simulations have provided insight into the distribution of the amorphous polymer in the blends during the crystallization process. The simulated results are in close accordance with the experimentally observed concentration profiles of atactic polypropyline during the crystallization of isotactic polypropylene in a blend of these polymers. Finally described are the unique thermodynamics and kinetics that occur in thermoplastic elastomer blends of polypropylene and synthetic rubber, leading to the unique biphasic crystalline morphology imparting these blends with their characteristic high toughness and high impact strength. Phase diagrams in such blends exhibit a combined upper and lower critical solution temperature. These phase diagrams have been calculated based on the present model developed, and simulated results explain the structural development in these blends."--Abstract.