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@ARTICLE{Zamponi:891446,
      author       = {Zamponi, M. and Kruteva, M. and Monkenbusch, M. and
                      Willner, L. and Wischnewski, A. and Hoffmann, I. and
                      Richter, D.},
      title        = {{C}ooperative {C}hain {D}ynamics of {T}racer {C}hains in
                      {H}ighly {E}ntangled {P}olyethylene {M}elts},
      journal      = {Physical review letters},
      volume       = {126},
      number       = {18},
      issn         = {0031-9007},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2021-01528},
      pages        = {187801},
      year         = {2021},
      abstract     = {By 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.},
      cin          = {JCNS-FRM-II / MLZ / JCNS-1 / JCNS-2 / JCNS-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 / I:(DE-588b)4597118-3 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)JCNS-2-20110106 /
                      I:(DE-Juel1)JCNS-4-20201012},
      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},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {34018790},
      UT           = {WOS:000652837900004},
      doi          = {10.1103/PhysRevLett.126.187801},
      url          = {https://juser.fz-juelich.de/record/891446},
}