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000028406 0247_ $$2DOI$$a10.1103/PhysRevLett.90.058302
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000028406 084__ $$2WoS$$aPhysics, Multidisciplinary
000028406 1001_ $$0P:(DE-Juel1)131040$$aWischnewski, A.$$b0$$uFZJ
000028406 245__ $$aDirect observation of the transition from free to constrained single-segment    motion in entangled polymer melts
000028406 260__ $$aCollege Park, Md.$$bAPS$$c2003
000028406 300__ $$a058302
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000028406 440_0 $$04925$$aPhysical Review Letters$$v90$$x0031-9007
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000028406 520__ $$aWe report a direct determination of the time dependent mean-squared segment displacement of a polymer chain in the melt covering the transition from free to constraint Rouse relaxation along the virtual tube of the reptation model. This has been achieved by a neutron spin-echo (NSE) measurement of the segmental self-correlation function as conveyed by the spin-incoherent scattering from two fully protonated polymer melts, polyethylene and polyethylene propylene. Within the scenario of de Gennes reptation model a transition of the time dependence of segmental mean-squared displacements from proportional tot(1/2) to proportional tot(1/4) is expected and clearly corroborated by the incoherent NSE results.
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000028406 7001_ $$0P:(DE-Juel1)VDB2684$$aMonkenbusch, M.$$b1$$uFZJ
000028406 7001_ $$0P:(DE-Juel1)VDB4260$$aWillner, L.$$b2$$uFZJ
000028406 7001_ $$0P:(DE-Juel1)130917$$aRichter, D.$$b3$$uFZJ
000028406 7001_ $$0P:(DE-Juel1)VDB18076$$aKali, G.$$b4$$uFZJ
000028406 773__ $$0PERI:(DE-600)1472655-5$$a10.1103/PhysRevLett.90.058302$$gVol. 90, p. 058302$$p058302$$q90<058302$$tPhysical review letters$$v90$$x0031-9007$$y2003
000028406 8567_ $$uhttp://hdl.handle.net/2128/1280$$uhttp://dx.doi.org/10.1103/PhysRevLett.90.058302
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