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000276574 1001_ $$0P:(DE-Juel1)162191$$aUnidad, Herwin Jerome$$b0$$eCorresponding author
000276574 245__ $$aConsequences of Increasing Packing Length on the Dynamics of Polymer Melts
000276574 260__ $$aWashington, DC$$bSoc.$$c2015
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000276574 520__ $$aWe revisit the nonuniversal aspect of polymer dynamics by considering both new and existing data on the zero-shear viscosity and linear viscoelastic response of various polymers, each with a wide range of molecular weights. Analysis of the zero-shear viscosity data in terms of the packing length p, whose role in entanglements has been discussed previously by Fetters and co-workers, reveals a behavior that is irreconcilable with our current understanding based on the tube model. Specifically, we find that the transition regime between Rouse and pure reptation dynamics, currently understood as the regime where contour length fluctuations are active, systematically shrinks as the packing length of the polymer increases. Further, we find that the slope of the loss moduli in the high-frequency wing of the terminal peak of well-entangled systems also decreases from the common −0.25 to −0.125 with increasing p. This is contrary to the single expected value of −0.25 from tube models which include contour length fluctuations or −0.5 from pure reptation. These findings hint on possible missing ingredients in our current understanding of polymer dynamics.
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000276574 7001_ $$0P:(DE-HGF)0$$aGoad, Mahmoud Abdel$$b1
000276574 7001_ $$0P:(DE-Juel1)140548$$aBras, Ana$$b2$$ufzj
000276574 7001_ $$0P:(DE-Juel1)131056$$aZamponi, Michaela$$b3$$ufzj
000276574 7001_ $$0P:(DE-HGF)0$$aFaust, Rudolf$$b4
000276574 7001_ $$0P:(DE-Juel1)130501$$aAllgaier, J.$$b5
000276574 7001_ $$0P:(DE-Juel1)130902$$aPyckhout-Hintzen, Wim$$b6$$ufzj
000276574 7001_ $$0P:(DE-Juel1)131040$$aWischnewski, Andreas$$b7$$ufzj
000276574 7001_ $$0P:(DE-Juel1)130917$$aRichter, Dieter$$b8$$ufzj
000276574 7001_ $$0P:(DE-HGF)0$$aFetters, Lewis J.$$b9
000276574 773__ $$0PERI:(DE-600)1491942-4$$a10.1021/acs.macromol.5b00341$$gVol. 48, no. 18, p. 6638 - 6645$$n18$$p6638 - 6645$$tMacromolecules$$v48$$x1520-5835$$y2015
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