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03300nmm a2200313 u 4500 |
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EBX01000000000000000512417 |
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140122 ||| eng |
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|a 9783540684497
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| 245 |
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|a Neutron Spin Echo Spectroscopy Viscoelasticity Rheology
|h Elektronische Ressource
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| 250 |
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|a 1st ed. 1997
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| 260 |
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|a Berlin, Heidelberg
|b Springer Berlin Heidelberg
|c 1997, 1997
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| 300 |
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|a VII, 248 p
|b online resource
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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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| 653 |
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|a Condensed Matter Physics
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| 653 |
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|a Polymers
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| 653 |
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|a Condensed matter
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| 710 |
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|a SpringerLink (Online service)
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|a eng
|2 ISO 639-2
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| 989 |
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|b SBA
|a Springer Book Archives -2004
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| 490 |
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|a Advances in Polymer Science
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| 028 |
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|a 10.1007/3-540-68449-2
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| 856 |
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|u https://doi.org/10.1007/3-540-68449-2?nosfx=y
|x Verlag
|3 Volltext
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|a 620.192
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|a 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
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| 520 |
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|a 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.
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| 520 |
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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].
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