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134 ADVANCES IN POLYMER SCIENCE NEUTRON SPIN ECHO SPECTROSCOPY VISCOELASTICITY RHEOLOGY by B. Ewen, D. Richter (auth.) is a nonfiction available to read on EtoBox.

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Viscoelasticandtransportpropertiesofpolymersintheliquid(solution,melt)or liquid-like (rubber) state determine their processing and application to a large extent and are of basic physical interest [1--3]. An understanding of these dynamic properties at a molecular level, therefore, is of great importance. However,thisunderstandingiscomplicatedbythefactsthatdi?erentmotional processes may occur on di?erent length scales and that the dynamics are governed by universal chain properties as well as by the special chemical structure of the monomer units [4,5]. The earliest and simplest approach in this direction starts from Langevin equations with solutions comprising a spectrum of relaxation modes [1--4]. Special features are the incorporation of entropic forces (Rouse model, [6]) which relax uctuations of reduced entropy, and of hydrodynamic interactions (Zimm model, [7]) which couple segmental motions via long-range back ow elds in polymer solutions, and the inclusion of topological constraints or entanglements (reptation or tube model, [8--10]) which are mutually imposed within a dense ensemble of chains. Another approach, neglecting the details of the chemical structure and concentrat

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Author

B. Ewen, D. Richter (auth.)

Publisher

Springer-Verlag Berlin Heidelberg

Published

1997

Language

EN

ISBN

9783662148037

Category

nonfiction

Subjects

Science, Chemistry, Engineering