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978-3-540-68449-7 |
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121227s1997 gw | s |||| 0|eng d |
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|a 9783540684497
|9 978-3-540-68449-7
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|a 10.1007/3-540-68449-2
|2 doi
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|a 541.2254
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|a Neutron Spin Echo Spectroscopy Viscoelasticity Rheology
|h [electronic resource].
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|a 1st ed. 1997.
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|a Berlin, Heidelberg :
|b Springer Berlin Heidelberg :
|b Imprint: Springer,
|c 1997.
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|a VII, 248 p.
|b online resource.
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|a text
|b txt
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|a computer
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|a online resource
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|a text file
|b PDF
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|a Advances in Polymer Science,
|x 0065-3195 ;
|v 134
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|a Neutron Spin Echo Investigations on the Segmental Dynamics of Polymers in Melts, Networks and Solutions -- Deformation and Viscoelastic Behavior of Polymer Gels in Electric Fields -- Rheology of Polymers Near Liquid-Solid Transitions.
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|a 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.
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|a Polymers .
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|a Condensed matter.
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|a Polymer Sciences.
|0 http://scigraph.springernature.com/things/product-market-codes/C22008
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|a Condensed Matter Physics.
|0 http://scigraph.springernature.com/things/product-market-codes/P25005
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|a SpringerLink (Online service)
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|t Springer eBooks
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|i Printed edition:
|z 9783662148037
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|i Printed edition:
|z 9783662148020
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|i Printed edition:
|z 9783540627135
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|a Advances in Polymer Science,
|x 0065-3195 ;
|v 134
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|u https://doi.org/10.1007/3-540-68449-2
|z Full Text via HEAL-Link
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|a ZDB-2-CMS
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|a ZDB-2-BAE
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|a Chemistry and Materials Science (Springer-11644)
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