Download or read book Rheology of Entangled Polymer Liquids written by Javier Sanchez-Reyes and published by . This book was released on 2003 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rheology of Entangled Polymer Liquids in Equibiaxial Elongational Flows written by Rebecca M. Mick and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Step Strain Rheology of Entangled Polymer Liquids written by Ritesh Ravi Nair and published by . This book was released on 2004 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonlinear Polymer Rheology written by Shi-Qing Wang and published by John Wiley & Sons. This book was released on 2018-01-02 with total page 664 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
Download or read book The Structure and Rheology of Complex Fluids written by Ronald G. Larson and published by OUP USA. This book was released on 1999-01-28 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Structure and Rheology of Complex Fluids describes the microstructures of polymeric, colloidal, amphiphilic, and liquid crystalline liquids, and the relationship between microstructure and mechanical and flow properties. It provides illustrations, practical examples, and worked problems. This book can serve as both a textbook for a graduate course and a research monograph.
Download or read book Rheological Fundamentals of Polymer Processing written by J.A. Covas and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experts in rheology and polymer processing present up-to-date, fundamental and applied information on the rheological properties of polymers, in particular those relevant to processing, contributing to the physical understanding and the mathematical modelling of polymer processing sequences. Basic concepts of non-Newtonian fluid mechanics, micro-rheological modelling and constitutive modelling are reviewed, and rheological measurements are described. Topics with practical relevance are debated, such as linear viscoelasticity, converging and diverging flows, and the rheology of multiphase systems. Approximation methods are discussed for the computer modelling of polymer melt flow. Subsequently, polymer processing technologies are studied from both simulation and engineering perspectives. Mixing, crystallization and reactive processing aspects are also included. Audience: An integrated and complete view of polymer processing and rheology, important to institutions and individuals engaged in the characterisation, testing, compounding, modification and processing of polymeric materials. Can also support academic polymer processing engineering programs.
Download or read book Rheology for Polymer Melt Processing written by J.-M. Piau and published by Elsevier. This book was released on 1996-10-10 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the main results obtained by different laboratories involved in the research group Rheology for polymer melt processing which is associated with French universities, schools of engineering, and the CNRS (Centre National de la Recherche Scientifique - France). The group comprises some 15 research laboratories of varied disciplines (chemistry, physics, material sciences, mechanics, mathematics), but with a common challenge viz. to enhance the understanding of the relationships between macromolecular species, their rheology and their processing. Some crucial issues of polymer science have been addressed: correlation of viscoelastic macroscopic bulk property measurements and models, slip at the wall, extrusion defects, correlation between numerical flow simulations and experiments. Features of the book: • The book is unique in that it allows one to grasp the key issues in polymer rheology and processing at once through a series of detailed state-of-the-art contributions, which were previously scattered throughout the literature. • Each paper was reviewed by experts and the book editors and some coordination was established in order to achieve a readable and easy access style. • Papers have been grouped in sections covering successively: Molecular dynamics, Constitutive equations and numerical modelling, Simple and complex flows. • Each paper can be read independently. Since the book is intended as an introduction to the main topics in polymer processing, it will be of interest to graduate students as well as to scientists in academic and industrial laboratories.
Download or read book Polymer and Composite Rheology written by Rakesh K. Gupta and published by CRC Press. This book was released on 2000-06-14 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analysis of polymer and composite rheology. This second edition covers flow properties of thermoplastic and thermoset polymers, and general principles and applications of all phases of polymer rheology, with new chapters on the rheology of particulate and fibre composites. It also includes new and expanded detail on polymer blends and emulsions,
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:
Download or read book How Do Entangled Polymer Liquids Flow written by Sham S. Ravindranath and published by . This book was released on 2010 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the nonlinear flow behavior of entangled polymer liquids has immense significance because of its direct relevance and usefulness in predicting behavior of these liquids during processing. In startup shear, it is well known that shear stress overshoot emerges when the rate of shearing is higher than the inverse of overall chain relaxation time [Tau]. For solutions with the number of entanglements per chain Z [greater than or equal to] 25, we have revealed using PTV that the shear field becomes inhomogeneous across the gap after the stress overshoot. For solutions with Z [greater than or equal to] 40, the shear stratification persists even in steady state, indicating that different states of chain entanglement are possible corresponding to the same shear stress. The number of entanglements per chain, Weissenberg number, the shear history, the type of solvent used, and polydispersity of the system are some of the control parameters that can strongly affect the observed nonlinearity. PTV observations of step strain experiments revealed a great deal of information about the physics of polymer flow. Contrary to the common perception that the entanglement network would be strong enough so that it would not collapse after a large step strain, macroscopic motions in the sample interior were observed after shear cessation at strains [greater than or equal to] 135%. The collapse of the entanglement network after shear cessation suggested that the entanglement network is a fragile system of finite cohesive strength and cannot escape structural failure. In other words, the network disintegrates when an elastic retractive force greater than the cohesive strength of the network is built due to deformation. PTV technique also revealed the coexistence of multiple shear rates under large amplitude oscillatory shear (LAOS) across the sample thickness in entangled solutions with Z [greater than or equal to] 25. In the Lissajous plots (shear stress vs. shear strain), distortion of an ellipse begins to appear when the nonlinear velocity profile is first noticed. These observations are again contrary to the conventional perception that the system undergoing LAOS will experience homogeneous shear in each cycle so that material functions can be introduced to analyze the nonlinear dependence of these functions on the amplitude and frequency. The above mentioned experimental observations in simple shear as well as in uniaxial elongation of entangled polymers has helped us to recognize that three forces (intermolecular locking force, retractive force and entanglement cohesive force) play important roles during response of a deformed entanglement network. The new theoretical considerations have further helped us to discover the striking scaling features associated with stress overshoot in well entangled polymer solutions and melts.
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:
Download or read book Polymer Rheology written by Jose Luis Rivera Armenta and published by BoD – Books on Demand. This book was released on 2018-10-03 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rheology is the science that studies the behavior of the flow of matter in a liquid state or soft solids under the application of stress or deformation to obtain a response to an applied force. In polymers, rheology is an important tool to understand behavior under processing conditions and to design equipment. Another application for rheology in the polymer field is to understand structure-property relationships by means of molecular weight, molecular weight distribution, stereochemistry, morphology, melt degradation, and performance under processing. This book covers the essential criteria for selecting the best test types for various applications and new developments, for accurately interpreting results, and for determining other areas where rheology and rheological phenomena may be useful in your work.
Download or read book Rheological Transients in Entangled Polymeric Fluids written by Yu-Hai Tony Liu and published by . This book was released on 1982 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonlinear Rheology of Entangled Polymers written by Prashant S. Tapadia and published by . This book was released on 2006 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A central task in polymer rheology is to search for constitutive equations that relate the flow field with the corresponding stress field in both transient and steady states. A parallel objective is to determine the state of chain conformation as a function of the flow condition. In disagreement with previous studies, our experimental data show that entangled monodisperse polymers respond differently to the applied shear strain and shear stress. In conventional shear strain rate controlled measurement, entangled polymers result in a stress plateau well known as shear thinning while a constitutive entanglement-disentanglement transition takes place when sheared in stress-controlled mode. Direct visualization of the velocity field using particle tracking velocimentry and flow birefringence reveals that entangled polymeric fluids develop a non-homogeneou flow field across the velocity gradient direction when sheared in rate-controlled mode. Lack of uniform shear deformation is observed when these fluids are subjected to large amplitude oscillatory shear at frequencies beyond overall chain relaxation rate. The combination of rheometry, rheo-optics and particle tracking velocimetry has lead to the discovery of an entanglement-disentanglement transition in shear stress mode and the presense of a shear rate gradient across sample the thickness in shear rate controlled mode. These new results may provide a reliable phenomenological basis for the future development of a realistic description of nonlinear polymer rheology."--Abstract.
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
Download or read book Nonlinear Rheology of Long chain Branched Polymers written by Gengxin Liu and published by . This book was released on 2015 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Entangled polymers show significant nonlinear rheological behaviors. Those studies on the mechanical behaviors of polymer melts and solutions not only promote our understanding on polymer dynamics, but also guide the application of polymers and establish principals to design polymeric materials. Recently emerged interpretations on nonlinear rheology of linear polymers proposed by Dr. Shi-Qing Wang emphasize the network nature of entangled polymers. This dissertation studies the nonlinear rheology of long-chain branched (LCB) polymers. A new synthetic method is developed and implemented to overcome the limitation of previous methods for not being able to synthesize long enough branches. This method can produce ultra-high molecular weight LCB polymers with branches of identical length and uniform spacing between branch points. Polymers with multiple long branches show remarkable resistance to the elastic-driven decohesion comparing to linear polymers. In startup uniaxial extension, they are extraordinarily more stretchable. An empirical rule shows that the failure of entangled network, as characterized by the overshoot of engineering stress, is proportional to the square root of number of entanglements. Polymers with LCB are also more resistant to failure in stepwise extension (withstand a larger stretching ratio), which would be part of film blowing process. Historically, strain hardening stands for the upward deviation of transient extensional viscosity comparing to zero-rate transient viscosity, which typically shows up on branched polymers. Under the newly emerged conceptual framework, such behavior is due to three factors: firstly, the shrinking cross-section area leads to a factor of extension ratio in calculating true stress and transient extensional viscosity; secondly, the introduction of branches suppresses the breakdown of entangled network; lastly, the entanglement network is strengthened at sufficient high Hencky rates during extension. Entangled polymeric liquids have so far only shown strain softening upon startup shear, signified by stress overshoot. However, solutions of polystyrenes with LCB exhibit strain hardening upon startup shear at high shear rates, undergoing non-Gaussian chain stretching and reaching finite extensibility limit. The stronger than linear increase of the shear stress ends with a sharp decline, forming a cusp. At intermediate shear rates, stress overshoots always occur at the same strain, which is explained also by the length of backbone. The LCB polymers show a rich variety of transient responses to startup shear at different rates and open a large window of dynamics to meet practical applications.
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.
