Neutron Spin Echo Spectroscopy Viscoelasticity Rheology (Paperback, Softcover reprint of the original 1st ed. 1997)

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 concentratingontheuniversalelementsofchainrelaxation,isbasedondynamic scalingconsiderations[4,11].Inparticularinpolymersolutions,thisapproach o?ers an elegant tool to specify the general trends of polymer dynamics, although it su?ers from the lack of a molecular interpretation. A real test of these theoretical approaches requires microscopic methods, which simultaneously give direct access to the space and time evolution of the segmental di?usion. Here, quasi-elastic scattering methods play a crucial role sincetheyallowthemeasurementofthecorrespondingcorrelationfunctions.In particular,thehigh-resolutionneutronspinecho(NSE)spectroscopy[12-15]is very suitable for such investigations since this method covers an appropriate range in time (0.005)t/ns)40) and space (r/nm [15). Furthermore, the possibilityoflabellingbyhydrogen-deuteriumexchangeallowstheobservation of single-chain behavior even in the melt.

General

Imprint:	Springer-Verlag
Country of origin:	Germany
Series:	Advances in Polymer Science, 134
Release date:	October 2013
First published:	1997
Contributors:	B. Ewen • M Mours • D. Richter • T. Shiga • H H Winter
Dimensions:	235 x 155 x 13mm (L x W x T)
Format:	Paperback
Pages:	248
Edition:	Softcover reprint of the original 1st ed. 1997
ISBN-13:	978-3-662-14803-7
Categories:	Books > Science & Mathematics > Physics > States of matter > General Books > Science & Mathematics > Chemistry > Organic chemistry > Polymer chemistry
LSN:	3-662-14803-X
Barcode:	9783662148037

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