Download or read book The Relationships Between Polymers and Glass Transition Temperatures written by O. G. Lewis and published by . This book was released on 1967 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, it has been found that interdependence of the rotations of neighboring bonds is of primary importance to the physical behavior of polymers. Mathematical methods for handling interdependent rotations were developed by Lifson and others for the calculation of characteristic polymer dimensions. The Gibbs-DiMarzio theory of the glass transition in polymers is formulated in such a way that interdependent rotations may be taken into account. Using an empirically estimated value of 0.025 for the free volume fraction at the transition temperature, the Gibbs-DiMarzio theory was fitted to empirically estimated transition temperatures for the n-alkanes, hexane to eicosane. A good fit was obtained with E sub 1 = 768 cal/mole for the energy difference between trans and gauche states, and gauche rotations of opposite sign excluded.
Download or read book Thermodynamic and Kinetic Aspects of the Vitreous State written by S.V. Nemilov and published by CRC Press. This book was released on 2018-01-18 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book to logically present the major problems of the vitreous state within the framework of irreversible thermodynamics. Filled with elementary explanations for difficult problems, this easily understood text/reference treats in detail the criteria of glass transition, the peculiarities of relaxing structural parameters, and the Prigogine-Defay ratio. Based on the author's rigorous generalization of the Second Law for non-equilibrium, the book systematizes all known thermodynamic data for glasses and melts. The thermodynamic essence of structural relaxation and memory effects are considered. The viscous flow theories are treated as a constituent of the kinetic description. All theoretical questions are illustrated by comparison of calculations with the experiments for glasses of inorganic and organic nature, with special attention to structural classification. An informative review of modern structural investigations is included. The bibliography follows the history of the main problems from the nineteenth century.
Download or read book The Relationships Between Polymers and Glass Transition Temperatures written by O. G. Lewis and published by . This book was released on 1967 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, it has been found that interdependence of the rotations of neighboring bonds is of primary importance to the physical behavior of polymers. Mathematical methods for handling interdependent rotations were developed by Lifson and others for the calculation of characteristic polymer dimensions. The Gibbs-DiMarzio theory of the glass transition in polymers is formulated in such a way that interdependent rotations may be taken into account. Using an empirically estimated value of 0.025 for the free volume fraction at the transition temperature, the Gibbs-DiMarzio theory was fitted to empirically estimated transition temperatures for the n-alkanes, hexane to eicosane. A good fit was obtained with E sub 1 = 768 cal/mole for the energy difference between trans and gauche states, and gauche rotations of opposite sign excluded.
Download or read book Assignment of the Glass Transition written by Rickey J. Seyler and published by ASTM International. This book was released on 1994 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relationships Between the Glass Transition Temperature and Chain Rigidity in Polymers written by and published by . This book was released on 1977 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Thin Films written by Ophelia Kwan Chui Tsui and published by World Scientific. This book was released on 2008 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ch. 1. Block copolymer thin films / J.-Y. Wang, S. Park and T. P. Russell -- ch. 2. Equilibration of block copolymer films on chemically patterned surfaces / G. S. W. Craig, H. Kang and P. F. Nealey -- ch. 3. Structure formation and evolution in confined cylinder-forming block copolymers / G. J. A. Sevink and J. G. E. M. Fraaije -- ch. 4. Block copolymer lithography for magnetic device fabrication / J. Y. Cheng and C. A. Ross -- ch. 5. Hierarchical structuring of polymer nanoparticles by self-organization / M. Shimomura ... [et al.] -- ch. 6. Wrinkling polymers for surface structure control and functionality / E. P. Chan and A. J. Crosby -- ch. 7. Crystallization in polymer thin films: morphology and growth / R. M. Van Horn and S. Z. D. Cheng -- ch. 8. Friction at soft polymer surface / M. K. Chaudhury, K. Vorvolakos and D. Malotky -- ch. 9. Relationship between molecular architecture, large-strain mechanical response and adhesive performance of model, block copolymer-based pressure sensitive adhesives / C. Creton and K. R. Shull -- ch. 10. Stability and dewetting of thin liquid films / K. Jacobs, R. Seemann and S. Herminghaus -- ch. 11. Anomalous dynamics of polymer Films / O. K. C. Tsui.
Download or read book Relationship Between the Glass Transition Temperature and the Chemical Structure of Polymers written by R. Becker and published by . This book was released on 1982 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Glass Transition written by E. Donth and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes and interrelates the following processes: cooperative alpha processes in a cold liquid, structural relaxation in the glass near Tg, the Johari-Goldstein beta process, the Williams-Götze process in a warm liquid, fast nonactivated cage rattling and boson peak, and ultraslow Fischer modes.
Download or read book Textbook of Polymer Science written by Fred W. Billmeyer and published by John Wiley & Sons. This book was released on 1984-03-21 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Third Edition of the classic, best-selling polymer science textbook surveys theory and practice of all major phases of polymer science, engineering, and technology, including polymerization, solution theory, fractionation and molecular-weight measurement, solid-state properties, structure-property relationships, and the preparation, fabrication and properties of commercially-important plastics, fibers, and elastomers.
Download or read book The Relationship Between the Chemical Structure of High Polymers and the Glass Transition Temperature written by Tsung-nêng Chʻi and published by . This book was released on 1967 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The relationship between the chemical structure of high polymers and the glass transition temperature by Qi Zong neng written by Qi Zong-neng and published by . This book was released on 1967 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Encyclopedia of Polymer Blends Volume 3 written by Avraam I. Isayev and published by John Wiley & Sons. This book was released on 2016-06-07 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete and timely overview of the topic, this Encyclopedia imparts knowledge of fundamental principles and their applications for academicians, scientists and researchers, while informing engineers, industrialists and entrepreneurs of the current state of the technology and its utilization. The most comprehensive source on polymer blends available on the market Offers a complete and timely overview of the topic Each article presents up to date research & development on a topic and its basic principles and applications, integrates case studies, laboratory and pilot plant experiments, and gives due reference to published and patented literature Equips academics, scientists and researchers with knowledge of fundamentals principles and their applications, and informs the engineers, industrialists and entrepreneurs about the state of the art technology and its applications
Download or read book The Influence of Cohesive Forces on the Glass Transition Temperatures of Polymers written by w. a Lee (Physicist, and SEWELL (J. H.)) and published by . This book was released on 1965 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: The relationship between cohesive energy (c.e.) or cohesive energy density (c.e.d.) and the glass transition temperature T sub G of polymers was re-examined on the basis of literature data. For polymers with T sub G's above 25 C there is no correlation between published or calculated values of c.e. or c.e.d. and T sub G. However, for the rest of the polymers there is a linear relationship between c.e.d. and T sub G, and a broad relationship between c.e. and T sub G. These results imply that c.e.d. is the regulating, though not the only, factor in determining T sub G's up to values of approximately 25 C. (Author).
Download or read book An Introduction to Glass Transition written by Roberta Ramirez and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Introduction to Glass Transition opens with a comparison of entropy function of temperature dependence with configurational entropy, which was published by various authors and found almost the same temperature dependence with overlap. From the dependence of the logarithm of configurational entropy vs. the logarithm of temperature, the authors suggest that it is possible to successfully predict the relations between the values of m for different glass formers.Following this, microscopic local dynamics were analyzed by way of atomistic molecular dynamics simulations through the conformational transition behavior across a wide range of temperatures. The glass transition temperature may be predicted through the intersection of separate temperature dependences. Such local dynamics were found to become gradually heterogeneous when the temperature went down close to the glassy state.The closing chapter provides a brief summary of the studies relevant to glass transitions in well-defined lipids systems such as anhydrous and/or water mixed systems. Then, some current problems and future problems are described.
Download or read book Calculation of the Glass Transition Temperatures of Linear Polymers Part 3 Evaluation of Calculation Relationships written by W. A. Lee and published by . This book was released on 1988 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four equations, relating the structure of polymers in numerical form to their glass transition temperatures (Tg)s, are evaluating using a large data set of 1179 polymers. Additive temperature parameters, for the relationship giving the best fit to the data, are tabulated which enable predictions to be made of many polymer Tgs outside the data set. These parameters also provide a measure of the relative effectiveness of groups in internally plasticising polymers. Great Britain. (JES).
Download or read book Structure Property Relationships in Polymers written by Charles E. Carraher Jr. and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first concern of scientists who are interested in synthetic polymers has always been, and still is: How are they synthesized? But right after this comes the question: What have I made, and for what is it good? This leads to the important topic of the structure-property relations to which this book is devoted. Polymers are very large and very complicated systems; their character ization has to begin with the chemical composition, configuration, and con formation of the individual molecule. The first chapter is devoted to this broad objective. The immediate physical consequences, discussed in the second chapter, form the basis for the physical nature of polymers: the supermolecular interactions and arrangements of the individual macromolecules. The third chapter deals with the important question: How are these chemical and physical structures experimentally determined? The existing methods for polymer characterization are enumerated and discussed in this chapter. The following chapters go into more detail. For most applications-textiles, films, molded or extruded objects of all kinds-the mechanical and the thermal behaviors of polymers are of pre ponderant importance, followed by optical and electric properties. Chapters 4 through 9 describe how such properties are rooted in and dependent on the chemical structure. More-detailed considerations are given to certain particularly important and critical properties such as the solubility and permeability of polymeric systems. Macromolecules are not always the final goal of the chemist-they may act as intermediates, reactants, or catalysts. This topic is presented in Chapters 10 and 11.
Download or read book The Dynamic Glass Transition Temperature in Polymeric Liquids written by Paul J. Mlynarczyk and published by LAP Lambert Academic Publishing. This book was released on 2014-06-17 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physical properties of polymers are very much dictated by where the operating temperature lies with respect to the transition temperature between glassy and rubbery states. The precise identification of this glass transition temperature, Tg, is critical in assessing the feasibility of a polymer for a given application. In this book, the behavior of polymers near their Tg and the capability of predicting Tg using theoretical and empirical models is assessed. While all polymers undergo structural relaxation at various temperatures both nearly above and below Tg, practical assessment of a single consistent Tg is successfully performed through consideration of only immediate thermal history and thermodynamic properties. The determination of Tg for a wide variety of polymers of theoretically infinite chain length has been found to be accurately performed through the use of novel quantitative structure-property relationship (QSPR) models. The supplementation of such values to configurational entropy and molecular weight relational models can be used for estimation of Tg for shorter chain length polymers within the same homologous series, but only to a specific lower bound.
