The Effects Of Intermolecular Forces On The Rheology Of Polymers I Effects Below The Glass Temperature

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The Effects of Intermolecular Forces on the Rheology of Polymers I: Effects Below the Glass Temperature

Author : Edward P. Otocka
Publisher :
ISBN 13 :
Total Pages : 25 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis The Effects of Intermolecular Forces on the Rheology of Polymers I: Effects Below the Glass Temperature by : Edward P. Otocka

Download or read book The Effects of Intermolecular Forces on the Rheology of Polymers I: Effects Below the Glass Temperature written by Edward P. Otocka and published by . This book was released on 1964 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two series of styrene copolymers were prepared, containing, respectively, acidic and basic comonomers. The mechanical properties of these copolymers were determined for several temperatures below T sub g. Stoichiometric mixtures of these acidic and basic copolymers were studied over the same temperature range, and their mechanical properties compared to those of the parent materials. It was found that the stoichiometric mixtures showed increased modulus, tensile strength and relaxation times. The increases can be related to functional group content and temperature through simple equations. (Author).

The Effects of Intermolecular Forces on Polymer Rheology, II. Hydrogen Bonding Above Tg

Author : Edward P. Otocka
Publisher :
ISBN 13 :
Total Pages : 50 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis The Effects of Intermolecular Forces on Polymer Rheology, II. Hydrogen Bonding Above Tg by : Edward P. Otocka

Download or read book The Effects of Intermolecular Forces on Polymer Rheology, II. Hydrogen Bonding Above Tg written by Edward P. Otocka and published by . This book was released on 1966 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of three butadiene/methacrylic acid copolymers and three butadiene/2-methyl-5-vinyl pyridine copolymers were evaluated for Young's modulus and stress relaxation modulus between -75C and +75C. Corresponding members of the acidic and basic copolymer series were stoichiometrically combined to provide an intermolecularly hydrogen bonded material which was tested in the same manner. Comparison between the observed modulustemperature curves for the mixed material and the average of the parent materials' modulus-temperature curve reveals a regular, temperature dependent increase in Young's modulus above Tg. Below Tg the rate of increase decreases. The stress relaxation curves of the acidic, basic and mixed copolymers were normalized with respect to Tg. The curves were then differentiated to provide relaxation spectrum curves. The comparison of the average relaxation spectrum curves for the parent materials with that obtained for the mixed material shows depression of short time relaxation mechanisms. Infrared investigations of the hydrogen bond absorptions in stretched films are also discussed. (Author).

U.S. Government Research Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 2180 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis U.S. Government Research Reports by :

Download or read book U.S. Government Research Reports written by and published by . This book was released on 1964 with total page 2180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Effects of Intermolecular Forces on Polymer Rheology, III. Ionic Forces Above Tg

Author : Edward P. Otacka
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (79 download)

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Book Synopsis The Effects of Intermolecular Forces on Polymer Rheology, III. Ionic Forces Above Tg by : Edward P. Otacka

Download or read book The Effects of Intermolecular Forces on Polymer Rheology, III. Ionic Forces Above Tg written by Edward P. Otacka and published by . This book was released on 1966 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: In an effort to determine the effects of ionic interactions on the physical properties of polymers, two series of butadiene copolymers were tested for stress strain and stress relaxation behavior. The first group of copolymers were those of butadiene and methacrylic acid which were converted to their anionic form by titration with LiOCH3. The second series were copolymers with 2-methyl, 5-vinyl pyridine which were reacted with CH3I to form the polycations. Finally stoichiometric mixed polysalts were prepared by mixing solutions of the oppositely charged polyions. The modulus-temperature currves of the various materials showed relatively stable plateau values over moderate temperature spans. Both the pyridinium copolymers and the mixed polysalts showed sharp decreases in modulus over a narrow temperature range. This unusual behavior was confirmed in the stress relaxation tests, being manifested as a rapid increase in the shift factors and E(visc), the activation energy for viscous flow. The patterns indicate a transition of one form or another but whether it is indicative of the onset of ionic interchange is not clear. (Author).

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 1008 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1978 with total page 1008 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.

Polymer Rheology: Theory and Practice

Author : Y.G. Yanovsky
Publisher : Springer Science & Business Media
ISBN 13 : 9401121168
Total Pages : 309 pages
Book Rating : 4.4/5 (11 download)

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Book Synopsis Polymer Rheology: Theory and Practice by : Y.G. Yanovsky

Download or read book Polymer Rheology: Theory and Practice written by Y.G. Yanovsky and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present book is devoted to a rapidly developing field of science which studies the behavior of viscoelastic materials under the influence of deformation~the rheology of polymers. Rheology has long been treated as the theoretical foundation of polymer processing, and from this standpoint it is difficult to overesti mate its importance in practice. Rheology plays an important role in developing our ideas on the nature of viscoelastic behavior in connection with the structural features of polymers and composites based on them. This expands the possibilities of employing rheological methods to characterize a variety of materials and greatly magnifies the interest in this field of research. The rheological properties of polymer systems are studied experimen tally, chiefly under conditions of shear and tensile strains. One explana tion is that many aspects of polymer material processing are associated with the stretching of melts or a combination of shear and tensile strains. In scientific investigations, either periodic or continuous conditions of shear deformation are employed. Each mode provides widespread infor mation. In periodic deformation, most attention is generally given to conditions with low deformation amplitudes that do not alter the structure of the polymer system during an experiment (the region of linear deformation conditions). Here the viscoelastic parameters are generally determined with respect to the frequency. Continuous deforma tion involves considerable strains, and may be attended by significant reversible and irreversible changes in the structure of a polymer.

Polymer Rheology

Author : Lawrence E. Nielsen
Publisher :
ISBN 13 :
Total Pages : 222 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Polymer Rheology by : Lawrence E. Nielsen

Download or read book Polymer Rheology written by Lawrence E. Nielsen and published by . This book was released on 1977 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Nonlinear Polymer Rheology

Author : Shi-Qing Wang
Publisher : John Wiley & Sons
ISBN 13 : 0470946989
Total Pages : 470 pages
Book Rating : 4.4/5 (79 download)

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Book Synopsis Nonlinear Polymer Rheology by : Shi-Qing Wang

Download or read book Nonlinear Polymer Rheology written by Shi-Qing Wang and published by John Wiley & Sons. This book was released on 2018-02-06 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrating latest research results and characterization techniques, this book helps readers understand and apply fundamental principles in nonlinear polymer rheology. The author connects the basic theoretical framework with practical polymer processing, which aids practicing scientists and engineers to go beyond the existing knowledge and explore new applications. Although it is not written as a textbook, the content can be used in an upper undergraduate and first year graduate course on polymer rheology. • Describes the emerging phenomena and associated conceptual understanding in the field of nonlinear polymer rheology • Incorporates details on latest experimental discoveries and provides new methodology for research in polymer rheology • Integrates latest research results and new characterization techniques like particle tracking velocimetric method • Focuses on the issues concerning the conceptual and phenomenological foundations for polymer rheology • Has a companion website for readers to access with videos complementing the content within several chapters

Bulletin of the 3rd Meeting

Author : Interagency chemical Rocket Propulsion Group. Mechanical Behavior Working Group
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Bulletin of the 3rd Meeting by : Interagency chemical Rocket Propulsion Group. Mechanical Behavior Working Group

Download or read book Bulletin of the 3rd Meeting written by Interagency chemical Rocket Propulsion Group. Mechanical Behavior Working Group and published by . This book was released on 1964 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Journal of Research of the National Bureau of Standards

Author : United States. National Bureau of Standards
Publisher :
ISBN 13 :
Total Pages : 736 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Journal of Research of the National Bureau of Standards by : United States. National Bureau of Standards

Download or read book Journal of Research of the National Bureau of Standards written by United States. National Bureau of Standards and published by . This book was released on 1964 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Polymer Behavior Under the Influence of Interfacial Interactions

Author : Jamie Michael Kropka
Publisher :
ISBN 13 :
Total Pages : 290 pages
Book Rating : 4.:/5 (243 download)

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Book Synopsis Polymer Behavior Under the Influence of Interfacial Interactions by : Jamie Michael Kropka

Download or read book Polymer Behavior Under the Influence of Interfacial Interactions written by Jamie Michael Kropka and published by . This book was released on 2008 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: The properties of polymers, thin films or bulk, are profoundly influenced by interactions at interfaces with dissimilar materials. Thin, supported, polymer films are subject to interfacial instabilities, due largely to competing intermolecular forces, that cause them to rupture and dewet the substrate. The addition of nanoparticles (such as clay sheets, metallic or semiconductor nanocrystals, carbon nanotubes, etc.) to polymers can substantially affect bulk properties, such as the glass transition and viscosity, and influence the processability of the material. In this dissertation, we contribute to a fundamental understanding of the role of interfacial interactions on both the instabilities exhibited by polymer thin films and the properties displayed by polymer-nanoparticle mixtures. While conditions under which the destabilization of compositionally homogeneous thin films occurs are relatively well understood, the mechanisms of film stabilization in many two-component thin film systems are still unresolved. We demonstrate that the addition of a miscible component to an unstable film can provide an effective means of stabilization. The details of the stabilization mechanism are understood in terms of the compositional dependence of both the macroscopic wetting parameters and the effective interface potential for the system. We find that the suppression of dewetting in the system is not an equilibrium stabilization process and propose a mechanism by which the increased resistance to dewetting may occur. There is also significant interest in understanding the extraordinary property enhancement of polymers that are enabled by the addition of only small concentrations of nanoparticles. If these effects could be distilled down to a few simple rules, they could be exploited in the design of materials for specific applications. In this work, the influence of C60 nanoparticles on the bulk dynamical properties of three polymers is examined. Based on the findings from a range of measurement techniques, including differential scanning calorimetry, dynamic mechanical analysis, dynamic rheology and neutron scattering, we propose that the changes in the glass transition temperature for the polymer-C60 mixtures can be understood in terms of a percolation interpretation of the glass transition. The proposed mechanism is also characterized computationally.

Tribology of Polymeric Nanocomposites

Author : Klaus Friedrich
Publisher : Butterworth-Heinemann
ISBN 13 : 0444594647
Total Pages : 835 pages
Book Rating : 4.4/5 (445 download)

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Book Synopsis Tribology of Polymeric Nanocomposites by : Klaus Friedrich

Download or read book Tribology of Polymeric Nanocomposites written by Klaus Friedrich and published by Butterworth-Heinemann. This book was released on 2013-05-14 with total page 835 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tribology of Polymeric Nanocomposites provides a comprehensive description of polymeric nanocomposites, both as bulk materials and as thin surface coatings, and provides rare, focused coverage of their tribological behavior and potential use in tribological applications. Providing engineers and designers with the preparation techniques, friction and wear mechanisms, property information and evaluation methodology needed to select the right polymeric nanocomposites for the job, this unique book also includes valuable real-world examples of polymeric nanocomposites in action in tribological applications. - Provides a complete reference to polmer nanocomposite material use in tribology from preparation through to selection and use - Explains the theory through examples of real-world applications, keeping this high-level topic practical and accessible - Includes contributions from more than 20 international tribology experts to offer broad yet detailed coverage of this fast-moving field

Berichte der Deutschen Rheologischen Gesellschaft e.V. mit Dokumentation Rheologie

Author : Deutsche Rheologische Gesellschaft
Publisher :
ISBN 13 :
Total Pages : 1480 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Berichte der Deutschen Rheologischen Gesellschaft e.V. mit Dokumentation Rheologie by : Deutsche Rheologische Gesellschaft

Download or read book Berichte der Deutschen Rheologischen Gesellschaft e.V. mit Dokumentation Rheologie written by Deutsche Rheologische Gesellschaft and published by . This book was released on 1965 with total page 1480 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Plastics Technology Handbook

Author : Manas Chanda
Publisher : CRC Press
ISBN 13 : 1498786227
Total Pages : 1012 pages
Book Rating : 4.4/5 (987 download)

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Book Synopsis Plastics Technology Handbook by : Manas Chanda

Download or read book Plastics Technology Handbook written by Manas Chanda and published by CRC Press. This book was released on 2017-11-07 with total page 1012 pages. Available in PDF, EPUB and Kindle. Book excerpt: Updated throughout to reflect advances over the last decade, the Fifth Edition continues the handbook’s tradition of authoritative coverage of fundamentals, production methods, properties, and applications of plastics and polymer-based materials. It covers tooling for plastics fabrication processes, thermoplastics, thermosetting plastics, foamed plastics, reinforced plastics, plastisols, and new developments in mold design. It also discusses rubber compounding and processing technologies. More recent developments in polymer fabrication and processing, including electrospinning, electrografted coating, polymer-metal hybrid joining, flex printing, and rapid prototyping/ 3D printing, are also presented. The handbook highlights advanced materials including natural and synthetic gfnanosize polymers, their unusual properties, and innovative applications, as well as polymer-carbon nanocomposites, graphene-based polymer nanocomposites, smart healable polymer composites, smart polymer coatings, electroactive polymers, polymer nanomaterials, and novel nano-/microfibrillar polymer composites. It offers updates on polymer solar battery development, plastics recycling and disposal methods, new concepts of "upcycling" and single-polymer composites, renewable synthetic polymers, biodegradable plastics and composites, and toxicity of plastics. The book also provides an overview of new developments in polymer applications in various fields including packaging, building and construction, corrosion prevention and control, automotive, aerospace applications, electrical and electronic applications, agriculture and horticulture, domestic appliances and business machines, medical and biomedical applications, marine and offshore applications, and sports.

Polymer Rheology and Processing

Author : A.A. Collyer
Publisher : Springer Science & Business Media
ISBN 13 : 9781851665570
Total Pages : 494 pages
Book Rating : 4.6/5 (655 download)

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Book Synopsis Polymer Rheology and Processing by : A.A. Collyer

Download or read book Polymer Rheology and Processing written by A.A. Collyer and published by Springer Science & Business Media. This book was released on 1990-10-31 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Melt Rheology and its Applications in the Plastics Industry

Author : John M Dealy
Publisher : Springer Science & Business Media
ISBN 13 : 9400763956
Total Pages : 311 pages
Book Rating : 4.4/5 (7 download)

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Book Synopsis Melt Rheology and its Applications in the Plastics Industry by : John M Dealy

Download or read book Melt Rheology and its Applications in the Plastics Industry written by John M Dealy and published by Springer Science & Business Media. This book was released on 2013-05-14 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the second edition of Melt Rheology and its Role in Plastics Processing, although the title has changed to reflect its broadened scope. Advances in the recent years in rheometer technology and polymer science have greatly enhanced the usefulness of rheology in the plastics industry. It is now possible to design polymers having specific molecular structures and to predict the flow properties of melts having those structures. In addition, rheological properties now provide more precise information about molecular structure. This book provides all the information that is needed for the intelligent application of rheology in the development of new polymers, the determination of molecular structure and the correlation of processability with laboratory test data. Theory and equations are limited to what is essential for the use of rheology in the characterization of polymers, the development of new plastics materials and the prediction of plastics processing behavior. The emphasis is on information that will be of direct use to practitioners. Extensive references are provided for those wishing to pursue certain issues in greater depth. While the primary audience is applied polymer scientists and plastics engineers, the book will also be of use to postgraduate students in polymer science and engineering and as a text for a graduate course.

Rheology

Author : Frederick R. Eirich
Publisher : Academic Press
ISBN 13 : 1483272982
Total Pages : 662 pages
Book Rating : 4.4/5 (832 download)

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Book Synopsis Rheology by : Frederick R. Eirich

Download or read book Rheology written by Frederick R. Eirich and published by Academic Press. This book was released on 2014-05-12 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rheology: Theory and Applications, Volume 5 focuses on overtly fluid behavior of polymers, including the theory of large deformations, thermoelastic effects, elastic phenomena observed during the extrusion of polymeric melts, and theories of the structure of liquids and glasses. The selection first elaborates on the application of large deformation theory to the thermomechanical behavior of rubberlike polymers and unstable flow of molten polymers. Discussions focus on the mechanism proposed for unstable flow, ripple and associated effects, direct observation of waviness phenomena, empirical behavior of porous, unfilled, and filled rubberlike polymers, and problems connected with the interpretation of mechanical response parameters. The text then examines elasticity effects in polymer extrusion and strength and extensibility of elastomers. The publication takes a look at free volume and polymer rheology and studies of the deformation of crystalline polymers. Topics include the contribution of the two orientation processes to the birefringence, deformation of superstructure, rate of orientation of crystalline regions, free volume and physical state, glass transition and free volume, and reappraisal of time-temperature superposition. The manuscript also elaborates on the deformation and dissipative processes in high polymeric solids and the thermodynamics of deformation. The selection is a vital source of data for researchers interested in the theories and applications of rheology.