Study Of Rheological Properties Of Polymeric Liquids By Using Multiple Mode Models
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Study Of Rheological Properties Of Polymeric Liquids By Using Multiple Mode Models
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Author :
language : en
Publisher:
Release Date : 2005
Study Of Rheological Properties Of Polymeric Liquids By Using Multiple Mode Models written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Knowledge of the rheological properties of non-Newtonian fluids is critical for modeling in polymer-processing equipment such as injection molders, extruders, and blow molders. Rheological measurements can be obtained through standard flows, such as shear flow and elongational flow. In our research, we modeled the rheological properties of polymeric fluids in several types of experiments: transient and steady shear flow, small amplitude oscillatory shear flow, transient elongational flow, and step-strain shear flow. The accuracy of modeling calculations depends critically on the performance of the rheological model used. Differential constitutive models with a single relaxation time can be used for exploratory fluid dynamics research and provide insight into the qualitative effects of viscoelasticity in complex flow fields. However, differential models with a single relaxation time give a poor quantitative description of rheological properties, since most non-Newtonian media exhibit not just one, but a whole spectrum of relaxation times; therefore multiple relaxation modes models were used in our research. One of the coupled linear relaxation models, the Two Coupled Maxwell Modes (TCMM) Model, was used to describe quantitatively shear-thickening behavior, which can be observed under certain conditions for high molecular weight polymers dissolved in low viscosity solvents. In this case, the shear viscosity of the polymer solution increases with increasing shear rate. A full parameterization of the TCMM Model to the experimental data from the literature provided a thorough understanding of the significance of the model parameters and a clear insight into the peculiar behavior of shear thickening in dilute polymer solutions. The primary part of the research focused on models with linear springs. A typical, industrial-grade, low-density polyethylene polymer was studied using three types of multi-mode models: i) uncoupled linear relaxation models; ii) coupled linear relaxation models; iii) uncoupled non-linear relaxation models. The data from small amplitude oscillatory shear flow and steady shear flow were fitted to obtain the parameters of the different models using the Nelder and Mead Downhill Simplex method. Then the predictions for the other standard flows mentioned in the first paragraph were compared with experimental data. This allowed us to determine the degree of the performance of the different models with regards to the corresponding system studied. Overall evaluations of model performance were presented in detail. Finally, we tested the effects of spring type on the performance of the models described above. We replaced the linear elastic springs in all of the prior models with nonlinear springs to determine whether this would improve model performance in elongational flow. The Finitely-Extensible Nonlinear Elastic Spring Model was used to describe the nonlinear elastic springs. The result was negative, however: no improvement was obtained over the linear spring models and more parameters were present which required further fitting to experimental data.
Polymer Rheology Theory And Practice
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Author : Y.G. Yanovsky
language : en
Publisher: Springer
Release Date : 1993-09-30
Polymer Rheology Theory And Practice written by Y.G. Yanovsky and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993-09-30 with Mathematics categories.
Rheology has long been treated as the theoretical foundation of polymer processing and in recent years it has been a rapidly developing field of science. Attention is focused on those aspects that are most important today, namely the general laws of rheological behavior of composite systems, including blends of polymers, copolymers and filled compositions. It is the structural features of these systems that ensure their useful properties as materials intended for engineering purposes. Annotation copyright by Book News, Inc., Portland, OR
Rheology In Polymer Processing
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Author : Chang Dae Han
language : en
Publisher:
Release Date : 1976
Rheology In Polymer Processing written by Chang Dae Han and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Technology & Engineering categories.
Polymer Rheology
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Author : Jose Luis Rivera Armenta
language : en
Publisher: BoD – Books on Demand
Release Date : 2018-10-03
Polymer Rheology written by Jose Luis Rivera Armenta and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-03 with Science categories.
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.
Polymer And Composite Rheology
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Author : Rakesh K. Gupta
language : en
Publisher: CRC Press
Release Date : 2000-06-14
Polymer And Composite Rheology written by Rakesh K. Gupta and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-06-14 with Technology & Engineering categories.
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, foams, reacting systems, and flow through porous media as well as composite processing operations.
Rheology Of Filled Polymer Systems
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Author : A.V. Shenoy
language : en
Publisher: Springer Science & Business Media
Release Date : 1999-01-31
Rheology Of Filled Polymer Systems written by A.V. Shenoy and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-01-31 with Mathematics categories.
The rheology of filled polymer systems is an ever expanding field in the polymer industry today. Using a concise, practical and simple format this comprehensive work explains the concepts behind filled polymer systems and the rheological techniques involved in studying their behaviour. Aware that the readers of the book may come from differing background, the first three chapters familiarize the reader with the basics about polymers, fillers and physicochemical interactions between them, rheology and rheometry. Covering such topics as preparation of filled polymer systems, steady shear viscous properties and extentional flow properties, this book covers the areas of importance from an introductory level through to more complex issues.
Polymer Rheology
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Author : Y G Yanovsky
language : en
Publisher:
Release Date : 1993-09-30
Polymer Rheology written by Y G Yanovsky and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993-09-30 with categories.
Rheo Physics Of Multiphase Polymer Systems
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Author : Kai Sondergaard
language : en
Publisher: CRC Press
Release Date : 1995-06-02
Rheo Physics Of Multiphase Polymer Systems written by Kai Sondergaard and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995-06-02 with Technology & Engineering categories.
FROM THE PREFACE Almost all polymeric systems are subjected to a flow field at least once along the route between preparation and application. . . . There is also an increased interest in predictive models on phase behavior and suitable techniques for characterizing the structure of these systems when subjected to flow. Multiphase polymeric systems are particularly susceptible to flow, which may cause orientation of species, morphological changes, and phase transitions. All these events may, in turn, affect the end product properties, such as permeability, electrical conductivity, [and] mechanical properties. In processing, escalating needs have evolved for optimization and development of novel and more uniform product properties and increased productivity. In order to arrive at an understanding of processing polymeric systems under elastic flow conditions, it is convenient to analyze the basic physical mechanisms under conditions that enable development of predictive models in conjunction with controlled experimentation. . . . In recent years, the science of rheo-physics has evolved and now involves both advanced theories and experimental techniques. Rheo-physics means the rheological, morphological, and thermodynamic behavior of structured polymer systems during flow. . . . In this monograph, the rheo-optical techniques are . . . emphasized. The book gives an introduction to rheo-physics, including fundamentals of theories, and a representative selection of applications of rheo-optical techniques for analyzing multiphase systems. The chapters contain both practical advice for the new experimenter . . . as well as review material for the experienced scientist.
The Study Of The Rheological Properties Of Polymeric Solutions In Steady Shear Flow Using A Slit Rheometer
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Author : Robert Michael Ybarra
language : en
Publisher:
Release Date : 1980
The Study Of The Rheological Properties Of Polymeric Solutions In Steady Shear Flow Using A Slit Rheometer written by Robert Michael Ybarra and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Fluid dynamics categories.
Correlations Of Rheological Properties And Anti Misting Performances For Dilute Polymer Solutions
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Author : Keith Ko-kung Chao
language : en
Publisher:
Release Date : 1981
Correlations Of Rheological Properties And Anti Misting Performances For Dilute Polymer Solutions written by Keith Ko-kung Chao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.