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@ARTICLE{Wischnewski:28406,
      author       = {Wischnewski, A. and Monkenbusch, M. and Willner, L. and
                      Richter, D. and Kali, G.},
      title        = {{D}irect observation of the transition from free to
                      constrained single-segment motion in entangled polymer
                      melts},
      journal      = {Physical review letters},
      volume       = {90},
      issn         = {0031-9007},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-28406},
      pages        = {058302},
      year         = {2003},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {We report a direct determination of the time dependent
                      mean-squared segment displacement of a polymer chain in the
                      melt covering the transition from free to constraint Rouse
                      relaxation along the virtual tube of the reptation model.
                      This has been achieved by a neutron spin-echo (NSE)
                      measurement of the segmental self-correlation function as
                      conveyed by the spin-incoherent scattering from two fully
                      protonated polymer melts, polyethylene and polyethylene
                      propylene. Within the scenario of de Gennes reptation model
                      a transition of the time dependence of segmental
                      mean-squared displacements from proportional tot(1/2) to
                      proportional tot(1/4) is expected and clearly corroborated
                      by the incoherent NSE results.},
      keywords     = {J (WoSType)},
      cin          = {IFF-NST},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB34},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK242},
      shelfmark    = {Physics, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000180918300062},
      doi          = {10.1103/PhysRevLett.90.058302},
      url          = {https://juser.fz-juelich.de/record/28406},
}