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@ARTICLE{Sharma:911918,
      author       = {Sharma, Aakash and Kruteva, Margarita and Allgaier, Jürgen
                      and Hoffmann, Ingo and Falus, Peter and Monkenbusch, Michael
                      and Richter, Dieter},
      title        = {{C}hain {C}onfinement and {A}nomalous {D}iffusion in the
                      {C}ross over {R}egime between {R}ouse and {R}eptation},
      journal      = {ACS Macro Letters},
      volume       = {11},
      number       = {12},
      issn         = {2161-1653},
      address      = {Washington, DC},
      publisher    = {ACS},
      reportid     = {FZJ-2022-05165},
      pages        = {1343 - 1348},
      year         = {2022},
      abstract     = {By neutron spin echo (NSE) and pulsed field gradient (PFG)
                      NMR, we study the dynamics of a polyethylene-oxide melt
                      (PEO) with a molecular weight in the transition regime
                      between Rouse and reptation dynamics. We analyze the data
                      with a Rouse mode analysis allowing for reduced long
                      wavelength Rouse modes amplitudes. For short times,
                      subdiffusive center-of-mass mean square displacement
                      ⟨rcom2(t)⟩ was allowed. This approach captures the NSE
                      data well and provides accurate information on the
                      topological constraints in a chain length regime, where the
                      tube model is inapplicable. As predicted by reptation for
                      the polymer ⟨rcom2(t)⟩, we experimentally found the
                      subdiffusive regime with an exponent close to 𝜇=12,
                      which, however, crosses over to Fickian diffusion not at the
                      Rouse time, but at a later time, when the ⟨rcom2(t)⟩ has
                      covered a distance related to the tube diameter.},
      cin          = {JCNS-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {36409674},
      UT           = {WOS:000889682900001},
      doi          = {10.1021/acsmacrolett.2c00608},
      url          = {https://juser.fz-juelich.de/record/911918},
}