Bibliothèque de L'IMIST/CNRST

This book presents the main results obtained by different laboratories involved in the research group <Q>Rheology for polymer melt processing</Q> 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: and bull; 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. and bull; 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. and bull; Papers have been grouped in sections covering successively: Molecular dynamics, Constitutive equations and numerical modelling, Simple and complex flows. and bull; 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.

Includes bibliographical references and index.

Description based on print version record.

Cover -- Contents -- Preface -- PART I: MOLECULAR DYNAMICS -- Chapter I.1. The reptation model : tests through diffusion measurements in linear polymer melts -- Introduction -- The reptation model -- Diffusion measurements in polymer systems -- Interpretation and comparison with rheometrical data -- Conclusions -- Chapter I.2. Polybutadiene : NMR and Temporary elasticity -- Introduction -- Temporary network structures -- Segmental motions : dynamic screening effect -- Molten high polymers : semi-local dynamics -- Conclusion -- Chapter I.3. Chain relaxation processes of uniaxially stretched polymer chains : an infrared dichroism study -- Introduction -- Theoretical background in Infrared dichroism -- Experimental -- Theoretical basis of interpretation -- Results and discussion on isotopically labeled chains -- Results and discussion on isotopically labelled 6-arm stars -- Results and discussion on binary blends of long and short chains -- Conclusion -- Chapter I.4. Chain conformation in elongational and shear flow as seen by SANS -- Introduction -- Methodology -- Elongational flow -- Shear flow -- Conclusions and perspectives -- Chapter I.5. Molecular rheology and linear viscoelasticity -- Introduction -- Linear viscoelastic behaviour of linear and flexible chains -- basics and phenomenology -- The case of entangled monodisperse linear species : pure reptation -- Entangled model-branched polymers -- Entangled polydisperse linear chains : double reptation -- Effects of non entangled chains -- Problems still pending -- PART II: CONSTITUTIVE EQUATIONS AND NUMERICAL MODELLING -- Chapter II. 1. Experimental validation of non linear network models -- Introduction -- Theoretical aspects -- Experimental aspects -- Experimental validation of the Wagner model -- Experimental validation of the Phan Thien-Tanner model -- Conclusion -- Chapter II. 2. Mathematical analysis of differential models for viscoelastic fluids -- Introduction. The models -- Maxwell type models : loss of evolution and change of type -- Steady flows -- Unsteady flows -- Stability issues -- Numerical analysis of viscoelastic flows -- Conclusion -- Chapter II. 3. Computation of 2D viscoelastic flows for a differential constitutive equation -- Introduction -- Computation of a purely viscous flow -- Finite elements method for viscoelastic flows -- Application -- Conclusion -- PART III: SIMPLE AND COMPLEX FLOWS -- Chapter III. 1. Validity of the stress optical law and application of birefringence to polymer complex flows -- Introduction -- General relationships and usefulness of birefringence measurements -- Validity of the stress optical law -- Application to complex flow studies -- Conclusion -- Chapter III. 2. Comparison between experimental data and numerical models -- Introduction -- Materials -- Constitutive equations -- Flow geometries and experiments -- Numerical models -- Comparison between numerical results and experiments -- Conclusions -- Chapter III. 3. Slip at the wall -- Introduction -- Local determination of the velocity at the wall -- Molecular models and discussion -- Conclusions.

Use copy Restrictions unspecified star MiAaHDL

Electronic reproduction. [S.l.] : HathiTrust Digital Library, 2010. MiAaHDL

Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002. MiAaHDL

http://purl.oclc.org/DLF/benchrepro0212

digitized 2010 HathiTrust Digital Library committed to preserve pda MiAaHDL