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Journal of Rheology , 60 4 , Macromolecules , 49 11 , Collis, A. Add to Cart. The Journal of Physical Chemistry B , 26 , Graham, Peter D. Entangled polymer systems.
Young and Rhoda J. Hawkins and Tom C. Frischknecht , Scott T.
Asymmetric three-arm stars, in which two arms have the same length and the third is shorter, cross over from starlike to linear-like stress relaxation as the length of the third arm varies. We combine recent theories of stress relaxation in symmetric stars and in linear melts to predict the dynamic modulus of the asymmetric stars.
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Citations Publications citing this paper. Tube-based modeling of the dynamics of entangled polymer chains Volha Shchetnikava. Geometric interpretation of linear viscoelasticity and characterization of chain architecture of polymers Kwang Soo Cho. Coupled models for polymer synthesis and rheology to determine branching architectures and predict flow properties Chinmay Das , Wen-jun Li , Daniel J.
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. 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? 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? 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. Furthermore, the possibilityoflabellingbyhydrogen-deuteriumexchangeallowstheobservation of single-chain behavior even in the melt. JavaScript is currently disabled, this site works much better if you enable JavaScript in your browser.
Chemistry Polymer Science.