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).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1986 with total page 122 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 Technical Abstract Bulletin written by and published by . This book was released on 1982 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 604 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 processing parameters in the multiphase polymer systems with stable microstructures.
Download or read book Properties and Morphology of Amorphous Hydrocarbon Block Copolymers written by Mitchel Shen and published by . This book was released on 1978 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this review is to discuss the more recent advances in the investigation of the relation between the morphology of block copolymers and their properties. First we shall discuss the thermodynamic conditions under which homogeneous block copolymers can be formed. These homogeneous systems are interesting because their underlying chain dynamics can be treated by the accepted molecular models. Viscoelastic relaxation times computed from these theories are in good agreement with experimental data. Next we present some examples of block copolymer morphologies, taken from the electron micrographs now available in the literature. Statistical theories capable of satisfactorily explaining the observed morphologies are then briefly discussed. Finally the elastic, viscoelastic and rheological properties of these materials are described. In all instances the dominant influence of the microdomain structure on these properties is demonstrated.
Download or read book Dokumentation Rheologie written by and published by . This book was released on 1983 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Influence of the Interphase on the Statistical Thermodynamics and Rheology of Block Copolymers written by Clayton Paul Henderson and published by . This book was released on 1985 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Viscoelastic Properties of Homogeneous Block Copolymers written by David Romme Hansen and published by . This book was released on 1975 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Viscoelastic Properties of Block Copolymer homopolymer Blends written by Lester Tungnan Toy and published by . This book was released on 1974 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Viscoelastic Properties of Crystalline Block Copolymers written by Umesh Kumar Mehra and published by . This book was released on 1973 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific Bulletin written by and published by . This book was released on 1977 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Encyclopedia of Polymer Science and Engineering written by and published by . This book was released on 1985 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Methods of Polymer Analysis written by T.R Crompton and published by Smithers Rapra. This book was released on 2013-01-29 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the various thermal methods used for the characterisation of polymer properties and composition. All these methods study the properties of polymers as they change with temperature. The methods discussed in this book are: differential photocalorimetry, differential scanning calorimetry, dielectric thermal analysis, differential thermal analysis, dynamic mechanical analysis, evolved gas analysis, gas chromatography, gas chromatography combined with mass spectrometry, mass spectrometry, microthermal analysis, thermal volatilisation, thermogravimetric analysis and thermomechanical analysis. Each technique is discussed in detail and examples of the use of each technique are also given. Each chapter has an extensive list of references so that the reader can follow up topics of interest. This book will be a useful reference for those who already use any of these thermal methods but will also be of interest to undergraduates and those who are just starting to use these techniques.
Download or read book Block Copolymers written by Nikos Hadjichristidis and published by John Wiley & Sons. This book was released on 2003-04-28 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers may be classified as either homopolymers, consisting of one single repeating unit, or copolymers, consisting of two or more distinct repeating units. Block copolymers contain long contiguous blocks of two or more repeating units in the same polymer chain. Covering one of the hottest topics in polymer chemistry, Block Copolymers provides a coherent overview of the synthetic routes, physical properties, and applications of block copolymers. This pioneering text provides not only a guideline for developing synthetic strategies for creating block copolymers with defined characteristics, but also a key to the relationship between the physical properties of block copolymers and the structure and dynamics of materials. Covering features of the chemistry and physics of block copolymers that are not found in comparable texts, Block Copolymers illustrates the structure-activity relationship of block copolymers and offers suggestions for the design of specific applications. Divided into five sections-Block Copolymers includes chapters on: * Block Copolymers by Chemical Modification of Precursor Polymers * Nonlinear Block Copolymers * Adsorption of Block Copolymers at Solid-Liquid Interfaces * Theory of Block Copolymer Segregation * Phase Transformation Kinetics * Block Copolymer Morphology * Block Copolymer Dynamics Polymer chemists, physicists, chemical engineers, and materials scientists, as well as graduate students in polymer science, will find Block Copolymers to be an invaluable text.
Download or read book Adhesive Chemistry written by Lieng-Huang Lee and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 847 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the first symposium on Recent Advances in Adhesion, held September, 1971 in Washington, D. C. , this Division of the American Chemical Society has continuously sponsored several symposia on adhesion and adhesives. The chemists have gradually realized the importance of adhesion in various fields of science and technology. During these years, the science of adhesion has steadily grown along with progress in surface science and fracture mechanics. Moreover, new adhesives have been invented and applied in actual structures, for example, structural and aerospace adhesives. In response to socio-economic demands, new forms of adhesives have been introduced to combat the problems of pollution and to promote energy-conservation. The developments of hot-melt adhesives, waterborne adhesives, and radiation-curable adhesives are vivid examples of successes in solving some of the problems. As chemists, our hatural desire is to understand how those new adhesives and new forms of adhesives are made. Thus, we are interested in learning about the chemistry of adhesives so that we may create new generations of materials to satisfy future needs. It was based on this common interest that w~ set forth to org'anize this Symposium on Recent Developments in Adhesive Chemistry. It was held from March 21 through 23, 1983 in the Westin Hotel, Seattle, Washington. The Symposium was very well attended. As a matter of fact, for the first two sessions, we had to move from the smaller Mt. St.
