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Nonlinear Polymer Rheology

2018-01-02 Technology & Engineering
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Release : 2018-01-02
Genre : Technology & Engineering
Kind : eBook
Book Rating : 04X/5 ( reviews)

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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. This book was released on 2018-01-02. 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

Nonlinear Rheology of Entangled Polymers

2006 Polymers
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Release : 2006
Genre : Polymers
Kind : eBook
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Book Synopsis Nonlinear Rheology of Entangled Polymers by : Prashant S. Tapadia

Download or read book Nonlinear Rheology of Entangled Polymers written by Prashant S. Tapadia. This book was released on 2006. 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

Rheological Fundamentals of Polymer Processing

2013-04-17 Technology & Engineering
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Release : 2013-04-17
Genre : Technology & Engineering
Kind : eBook
Book Rating : 717/5 ( reviews)

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Book Synopsis Rheological Fundamentals of Polymer Processing by : J.A. Covas

Download or read book Rheological Fundamentals of Polymer Processing written by J.A. Covas. This book was released on 2013-04-17. 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.

Nonlinear Phenomena in Flows of Viscoelastic Polymer Fluids

2012-12-06 Technology & Engineering
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Release : 2012-12-06
Genre : Technology & Engineering
Kind : eBook
Book Rating : 584/5 ( reviews)

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Book Synopsis Nonlinear Phenomena in Flows of Viscoelastic Polymer Fluids by : A.I. Leonov

Download or read book Nonlinear Phenomena in Flows of Viscoelastic Polymer Fluids written by A.I. Leonov. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: This monograph presents theoretical and experimental studies of flows of elastic liquids. Falling into this category are particularly the melts and concentrated solutions of such flexible-chain polymers as polyethylene, polyisobutylene and polypropylene, all of which are widely used in polymer processing. These polydisperse polymers vary greatly, from batch to batch, in their mechanical properties and 20% variation in a property is believed to be good enough. l 7 All recent books - devoted to the rheology of polymers do not answer the question of which constitutive equations should be used for solving the fluid mechanic problems of polymer processing in the usual case of an appreciable nonlinear region of deformation where nonlinear effects of shear and extensional elasticity are very important. Viscoelastic constitut ive equations cited commonly (see, e.g. Refs 5 and 6) do not describe simultaneously even the simplest cases of deformations, viz. simple shear and uniaxial extension. Moreover, some of them are internally inconsist ent and sometimes display highly unstable behaviour in simple flows without any fundamental reasons. Even more respected molecular ap free from these defects.

Polymer and Composite Rheology, Second Edition,

2000-06-14 Technology & Engineering
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Release : 2000-06-14
Genre : Technology & Engineering
Kind : eBook
Book Rating : 229/5 ( reviews)

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Book Synopsis Polymer and Composite Rheology, Second Edition, by : Rakesh K. Gupta

Download or read book Polymer and Composite Rheology, Second Edition, written by Rakesh K. Gupta. This book was released on 2000-06-14. 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, foams, reacting systems, and flow through porous media as well as composite processing operations.

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