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@ARTICLE{Unidad:276574,
      author       = {Unidad, Herwin Jerome and Goad, Mahmoud Abdel and Bras, Ana
                      and Zamponi, Michaela and Faust, Rudolf and Allgaier, J. and
                      Pyckhout-Hintzen, Wim and Wischnewski, Andreas and Richter,
                      Dieter and Fetters, Lewis J.},
      title        = {{C}onsequences of {I}ncreasing {P}acking {L}ength on the
                      {D}ynamics of {P}olymer {M}elts},
      journal      = {Macromolecules},
      volume       = {48},
      number       = {18},
      issn         = {1520-5835},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2015-06939},
      pages        = {6638 - 6645},
      year         = {2015},
      abstract     = {We 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.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {6215 - Soft Matter, Health and Life Sciences (POF3-621) /
                      6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6215 / G:(DE-HGF)POF3-6G15 /
                      G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000361935600031},
      doi          = {10.1021/acs.macromol.5b00341},
      url          = {https://juser.fz-juelich.de/record/276574},
}