Download or read book Crystallization Kinetics of Polyethylene Oxide written by Mohammad Sabir and published by . This book was released on 1967 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Crystallization Kinetics of Poly ethylene Oxide written by Frances H. Segouin and published by . This book was released on 1994 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The three main goals of this project are to determine the molecular weight dependence of polyethylene oxide) on the 1) morphology of crystalline material, as seen with the polarizing light microscope, 2) nucleation of the crystalline phase, as demonstrated with an annealing study, and 3) parameters of a mathematical model for crystallization kinetics. Bulk crystallization kinetics of polyethylene oxide) from the melt have been studied for a large molecular weight range, 1500 g/mol to 7,000,000 g/mol. The effects of molecular weight and cooling rate on the width and degree of supercooling of DSC crystallization exotherms have been studied to determine the type of nucleation involved and to determine the relationship between the DSC signals and the morphology of a crystalline sample. As the molecular weight increases, at a cooling rate of twenty degrees per minute, the width-at-half- height of the exothermic DSC peak decreases from seven degrees to approximately three degrees for the low molecular weight samples and increases from three to seven degrees for the high molecular weight samples. The degree of supercooling at which the peaks reach a maximum generally increases from twelve degrees Celsius to above twenty degrees Celsius. The slower the cooling rate the narrower the width at half height of the crystallization peak and the lower the degree of supercooling at the maximum point of the crystallization exotherms. For all of the molecular weight samples, the crystallization peak temperatures increase in the range of one to ten degrees of supercooling from a one-degree-per-minute cooling rate to a twenty degrees-per-minute cooling rate. The average width-at-half-height increases from three to six- degrees Celsius from the one degree-per-minute cooling rate experiment to the twenty degreesper- minute cooling rate experiment. The morphology of the samples varied from a coarse non-interconnected lamellae formation below the critical molecular weight to an interconnected lamellae formation, also known as a spherulite, above the critical molecular weight. The critical molecular weight for polyethylene oxide) is 3400 g/mol. Based on the expression for the linear crystal growth rate, reported by Cheng et al.1, a mathematical model was created to model the DSC crystallization curves. This model, which incorporates heat transfer effects, can model the width and shape of the DSC curves, but the degree of supercooling that the model predicts is generally smaller than the experimental degree of supercooling. While modeling the DSC crystallization curves, it was found that the activation energy for reptation motion, U*, has less of an effect on the model crystallization curves than does the surface energy term, Kg, of the Cheng growth rate expression."--Abstract.
Download or read book Crystallization of Polymers Volume 2 Kinetics and Mechanisms written by Leo Mandelkern and published by Cambridge University Press. This book was released on 2004-09-30 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Crystallization of Polymers, 2nd Edition, Leo Mandelkern provides a self-contained, comprehensive, and up-to-date treatment of polymer crystallization. Volume 2 of this edition provides an authoritative account of the kinetics and mechanisms of polymer crystallization, building from the equilibrium concepts presented in volume 1. As crystalline polymers rarely, if ever, achieve their equilibrium state, this books serves as a bridge between equilibrium concepts and the state that is finally achieved. With a comprehensive treatment of the surrounding theories and experimental results from simple to complex polymer systems, this book will be an invaluable reference work for all chemists, physicists and materials scientists working in the area of polymer crystallization.
Download or read book Crystallization Kinetics of Polyethylene written by Allan Booth and published by . This book was released on 1969 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relationships Between Morphological Characteristics Kinetics of Crystallization and Crystallization Temperature for the Dilute Solution Crystallization of Poly ethylene Oxide written by Elaine Rose Williams and published by . This book was released on 1971 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Crystallization of Polymers written by Marcel Dosière and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the discovery that polymer single crystals are composed of chain folded macromolecules in 1957, the crystallization of polymers has attracted considerable interest and still provides fascinating and fruitful areas of research. Only a few books have been fully devoted to the crystallization of polymers in the past. This book contains the proceedings of the NATO ARW devoted to the `Crystallization of Polymers' which took place in September 1992 at the University of Mons-Hainaut (Belgium). In view of the variety of papers devoted to the crystallization of polymers, this book will be used in the next few years as a reference book for scientists concerned in the field of polymer physical chemistry. Crystallization of Polymers is mainly devoted to the experimental and theoretical study of the crystallization of synthetic polymers. As a kinetic study of the growth of polymer crystals should always be preceded by a morphological or a structural investigation, the structure, the morphology of polymer crystals and more particularly the lamellar and supralamellar organizations, as well as the nature of the crystal amorphous interface are reviewed and discussed.
Download or read book The Crystallization Kinetics of Polyethylene in Extensional Deformation written by Sheng Ma and published by . This book was released on 1994 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Crystallization Kinetics and Thermodynamic Properties of Linear Polyethylene Over an Extended Molecular Weight Range written by Ertugrul Hüsnü Ergöz and published by . This book was released on 1970 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Pressure on the Crystallization Kinetics of Poly ethylene Terephthalate written by and published by . This book was released on 1994 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Molecular Weight and Concentration on the Crystallization Kinetics of Polyethylene N hexadecane System written by Chih-Chang Chu and published by . This book was released on 1976 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Crystallization Kinetics and Morphological Studies of High density Polyethylene written by Edward F.-H. (Feng-Hwa) Chu and published by . This book was released on 1983 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rapidly Quenched Metals written by S Steeb and published by Elsevier. This book was released on 2012-12-02 with total page 1163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapidly Quenched Metals, Volume I covers the proceedings of the Fifth International Conference on Rapidly Quenched Metals, held in Wurzburg, Germany on September 3-7, 1984. The book focuses on amorphous and crystalline metals formed by rapid quenching from the melt. The selection first covers the scope and trends of developments in rapid solidification technology, rapid solidification, and undercooling of liquid metals by rapid quenching. Discussions focus on experimental method, powders, strip, particulate production, consolidation, and alloys and alloy systems. The text then examines the solidification of undercooled liquid alloys entrapped in solid; crystallization kinetics in undercooled droplets; and grain refinement in bulk undercooled alloys. The manuscript tackles the undercooling of niobium-germanium alloys in a 100 meter drop tube; influence of process parameters on the cooling rate of the meltspinning process; and the mechanism of ribbon formation in melt-spun copper and copper-zirconium. The formation and structure of thick sections of rapidly-solidified material by incremental deposition and production of ultrafine dispersions of rare earth oxides in Ti alloys using rapid solidification are also mentioned. The selection is a valuable reference for physicists, chemists, physical metallurgists, and engineers.
Download or read book Crystallization Kinetics of Polyethylene Terephthalate written by Leonard Henry Palys and published by . This book was released on 1977 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Graphene written by Cengiz Ozkan and published by John Wiley & Sons. This book was released on 2019-06-12 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fourth volume in a series of handbooks on graphene research and applications The Handbook of Graphene, Volume 4: Composites looks at composite materials exclusively. Topics covered include graphene composites and graphene-reinforced advanced composite materials. The following graphene-based subjects are discussed: ceramic composites; composite nanostructures; composites with shape memory effect; and scroll structures. Chapters also address: the fabrication and properties of copper–graphene composites; graphene–metal oxide composite as an anode material in li-ion batteries; supramolecular graphene-based systems for drug delivery; and other graphene-related areas of interest to scientists and researchers.
Download or read book Fast Scanning Calorimetry written by Christoph Schick and published by Springer. This book was released on 2016-06-28 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past decades, the scan rate range of calorimeters has been extended tremendously at the high end, from approximately 10 up to 10 000 000 °C/s and more. The combination of various calorimeters and the newly-developed Fast Scanning Calorimeters (FSC) now span 11 orders of magnitude, by which many processes can be mimicked according to the time scale(s) of chemical and physical transitions occurring during cooling, heating and isothermal stays in case heat is exchanged. This not only opens new areas of research on polymers, metals, pharmaceuticals and all kinds of substances with respect to glass transition, crystallization and melting phenomena, it also enables in-depth study of metastability and reorganization of samples on an 1 to 1000 ng scale. In addition, FSC will become a crucial tool for understanding and optimization of processing methods at high speeds like injection molding. The book resembles the state-of-the art in Thermal Analysis & Calorimetry and is an excellent starting point for both experts and newcomers in the field.
Download or read book Crystallization Behavior of Sheared Polyethylene Oxide Melts written by Robert D. Ulrich and published by . This book was released on 1972 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Introduction to Physical Polymer Science written by Leslie H. Sperling and published by John Wiley & Sons. This book was released on 2005-11-25 with total page 877 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Updated Edition of the Classic Text Polymers constitute the basis for the plastics, rubber, adhesives, fiber, and coating industries. The Fourth Edition of Introduction to Physical Polymer Science acknowledges the industrial success of polymers and the advancements made in the field while continuing to deliver the comprehensive introduction to polymer science that made its predecessors classic texts. The Fourth Edition continues its coverage of amorphous and crystalline materials, glass transitions, rubber elasticity, and mechanical behavior, and offers updated discussions of polymer blends, composites, and interfaces, as well as such basics as molecular weight determination. Thus, interrelationships among molecular structure, morphology, and mechanical behavior of polymers continue to provide much of the value of the book. Newly introduced topics include: Nanocomposites, including carbon nanotubes and exfoliated montmorillonite clays The structure, motions, and functions of DNA and proteins, as well as the interfaces of polymeric biomaterials with living organisms The glass transition behavior of nano-thin plastic films In addition, new sections have been included on fire retardancy, friction and wear, optical tweezers, and more. Introduction to Physical Polymer Science, Fourth Edition provides both an essential introduction to the field as well as an entry point to the latest research and developments in polymer science and engineering, making it an indispensable text for chemistry, chemical engineering, materials science and engineering, and polymer science and engineering students and professionals.
