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000891446 1001_ $$0P:(DE-Juel1)131056$$aZamponi, M.$$b0$$eCorresponding author$$ufzj
000891446 245__ $$aCooperative Chain Dynamics of Tracer Chains in Highly Entangled Polyethylene Melts
000891446 260__ $$aCollege Park, Md.$$bAPS$$c2021
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000891446 520__ $$aBy neutron spin echo spectroscopy, we have studied the center of mass motion of short tracer chains on the molecular length scale within a highly entangled polymer matrix. The center of mass mean square displacements of the tracers independent of their molecular weight is subdiffusive at short times until it has reached the size of the tube d; then, a crossover to Fickian diffusion takes place. This observation cannot be understood within the tube model of reptation, but is rationalized as a result of important interchain couplings that lead to cooperative chain motion within the entanglement volume ∼d3. Thus, the cooperative tracer chain motions are limited by the tube size d. If the center of mass displacement exceeds this size, uncorrelated Fickian diffusion takes over. Compared to the prediction of the Rouse model we observe a significantly reduced contribution of the tracer’s internal modes to the spectra corroborating the finding of cooperative rather than Rouse dynamics within d3.
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000891446 65017 $$0V:(DE-MLZ)GC-1602-2016$$2V:(DE-HGF)$$aPolymers, Soft Nano Particles and  Proteins$$x0
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000891446 7001_ $$0P:(DE-Juel1)130777$$aKruteva, M.$$b1
000891446 7001_ $$0P:(DE-Juel1)130849$$aMonkenbusch, M.$$b2
000891446 7001_ $$0P:(DE-Juel1)131036$$aWillner, L.$$b3
000891446 7001_ $$0P:(DE-Juel1)131040$$aWischnewski, A.$$b4
000891446 7001_ $$0P:(DE-HGF)0$$aHoffmann, I.$$b5
000891446 7001_ $$0P:(DE-Juel1)130917$$aRichter, D.$$b6
000891446 773__ $$0PERI:(DE-600)1472655-5$$a10.1103/PhysRevLett.126.187801$$gVol. 126, no. 18, p. 187801$$n18$$p187801$$tPhysical review letters$$v126$$x0031-9007$$y2021
000891446 8564_ $$uhttps://juser.fz-juelich.de/record/891446/files/Invoice_21_MAR_005422.pdf
000891446 8564_ $$uhttps://juser.fz-juelich.de/record/891446/files/PhysRevLett.126.187801.pdf$$yOpenAccess
000891446 8564_ $$uhttps://juser.fz-juelich.de/record/891446/files/zamponi_cor_PRL_Zamponi.pdf$$yOpenAccess
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