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@ARTICLE{Holler:858954,
      author       = {Holler, Stefan and Moreno, Angel J. and Zamponi, Michaela
                      and Bačová, Petra and Willner, Lutz and Iatrou, Hermis and
                      Falus, Peter and Richter, Dieter},
      title        = {{T}he {R}ole of the {F}unctionality in the {B}ranch {P}oint
                      {M}otion in {S}ymmetric {S}tar {P}olymers: {A} {C}ombined
                      {S}tudy by {S}imulations and {N}eutron {S}pin {E}cho
                      {S}pectroscopy},
      journal      = {Macromolecules},
      volume       = {51},
      number       = {1},
      issn         = {1520-5835},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2018-07780},
      pages        = {242 - 253},
      year         = {2018},
      abstract     = {We investigate the effect of the number of arms
                      (functionality f) on the mobility of the branch point in
                      symmetric star polymers. For this purpose we carry out
                      large-scale molecular dynamics simulations of simple
                      bead–spring stars and neutron spin echo (NSE) spectroscopy
                      experiments on center labeled polyethylene stars. This
                      labeling scheme unique to neutron scattering allows us to
                      directly observe the branch point motion on the molecular
                      scale by measuring the dynamic structure factor. We
                      investigate the cases of different functionalities f = 3, 4,
                      and 5 for different arm lengths. The analysis of the branch
                      point fluctuations reveals a stronger localization with
                      increasing functionality, following 2/f scaling. The dynamic
                      structure factors of the branch point are analyzed in terms
                      of a modified version, incorporating dynamic tube dilution
                      (DTD), of the Vilgis–Boué model for cross-linked networks
                      [ J. Polym. Sci., Part B 1988, 26, 2291−2302]. In DTD the
                      tube parameters are renormalized with the tube survival
                      probability φ(t). As directly measured by the simulations,
                      φ(t) is independent of f, and therefore the theory predicts
                      no f dependence of the relaxation of the branch point. The
                      theory provides a good description of the NSE data and
                      simulations for intermediate times. However, the
                      simulations, which have access to much longer time scales,
                      reveal the breakdown of the DTD prediction since increasing
                      the functionality actually leads to a slower relaxation of
                      the branch point.},
      cin          = {JCNS-FRM-II / Neutronenstreuung ; JCNS-1 / JCNS-2},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623) / 6215 - Soft Matter,
                      Health and Life Sciences (POF3-621)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF3-6215},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000419999000025},
      doi          = {10.1021/acs.macromol.7b01579},
      url          = {https://juser.fz-juelich.de/record/858954},
}