Neutron Spin Echo Spectroscopy Viscoelasticity Rheology (Advances in Polymer Science)

Ewen, B. (Contributor) / Mours, M. (Contributor) / Richter, D. (Contributor) / Shiga, T. (Contributor) / Winter, H.H. (Contributor)

ISBN 10: 366214803X / ISBN 13: 9783662148037

Published by Springer, 2013

About this Item

260 pages. 9.25x6.10x0.59 inches. In Stock.

Seller Inventory # x-366214803X

Bibliographic Details

• Title: Neutron Spin Echo Spectroscopy Viscoelasticity Rheology (Advances in Polymer Science)
• Publisher: Springer
• Publication Date: 2013
• Language: English
• ISBN 10: 366214803X
• ISBN 13: 9783662148037
• Binding: Paperback
• Condition: Brand New
• Weight: 0.4 kilograms

About this title

Synopsis

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.Inparticular,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.