Neutron spin echo spectroscopy, viscoelasticity, rheology.

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Bibliographic Details
Imprint:Berlin : Springer, 1999, c1997.
Language:English
Series:Advances in polymer science, 1436-5030 ; 134
Subject:
Format: E-Resource Book
URL for this record:http://pi.lib.uchicago.edu/1001/cat/bib/4741777
Hidden Bibliographic Details
Other authors / contributors:Ewen, B.
Richter, D. (Dieter), 1947-
Shiga, Tohru.
ISBN:3540627138
Computer file characteristics:Electronic data.
Notes:"Online publication: May 27, 1999."
Title from title screen.
Available electronically in PDF format to subscribers to Link, the information service of Springer Verlag.
Includes bibliographical references.
Mode of access: Internet.
Description
Summary: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.
Item Description:"Online publication: May 27, 1999."
Title from title screen.
Available electronically in PDF format to subscribers to Link, the information service of Springer Verlag.
Physical Description:Electronic data.
Format:Mode of access: Internet.
Bibliography:Includes bibliographical references.
ISBN:3540627138