Neutron Spin Echo Spectroscopy Viscoelasticity Rheology
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Neutron Spin Echo Spectroscopy Viscoelasticity Rheology

Neutron Spin Echo Spectroscopy Viscoelasticity Rheology


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About the Book

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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Product Details
  • ISBN-13: 9783540627135
  • Publisher: Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
  • Binding: Hardback
  • Height: 235 mm
  • No of Pages: 248
  • Series Title: Advances in Polymer Science
  • Weight: 750 gr
  • ISBN-10: 3540627138
  • Publisher Date: 04 Sep 1997
  • Depth: 19
  • Language: English
  • Returnable: Y
  • Spine Width: 0 mm
  • Width: 155 mm


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Neutron Spin Echo Spectroscopy Viscoelasticity Rheology
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