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@ARTICLE{Brodeck:19755,
      author       = {Brodeck, M. and Alvarez, F. and Colmenero, J. and Richter,
                      D.},
      title        = {{S}ingle {C}hain {D}ynamic {S}trucutre {F}actor of
                      {P}oly(ethylene oxide) in {D}ynamically {A}symmetric
                      {B}lends with {P}oly(methyl methacrylate). {N}eutron
                      {S}cattering and {M}olecular {D}ynamics {S}imulations},
      journal      = {Macromolecules},
      volume       = {45},
      issn         = {0024-9297},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {PreJuSER-19755},
      pages        = {536 - 542},
      year         = {2012},
      note         = {This research project has been supported by the European
                      Commission NoE SoftComp, Contract NMP3-CT-2004-502235, and
                      the "Donostia International Physics Center". J.C. and F.A.
                      acknowledge support from the projects MAT2007-63681 and
                      IT-436-07 (GV).},
      abstract     = {We have investigated the dynamically asymmetric polymer
                      blend composed of short (M-n approximate to 2 kg/mol)
                      poly(ethylene oxide) (PEO) and poly(methyl methacrylate)
                      (PMMA) chains focusing on the collective dynamics of the
                      fast PEO component. Using neutron spin-echo (NSE)
                      spectroscopy, the single chain dynamic structure factor of
                      PEO was investigated and compared to results from molecular
                      dynamics simulations. After a successful validation of the
                      simulations, a thorough analysis of the RPA approximation
                      reveals the composition of the experimentally measured total
                      scattering signal S(Qt). Using the simulations, we show and
                      calculate two contributions: (1) the relaxation of
                      hydrogenated PEO against deuterated PLO, yielding the single
                      chain dynamic structure factor of P:EO, and (2) the
                      relaxation of the PEO component against the,PMMA matrix For
                      the short chains presented here the second contribution
                      shows a significant decay at higher temperatures While it
                      was previously shown that, in the case of long chains, no
                      relaxation is found. This difference is related to a
                      decrease of the glass transition temperature which takes
                      place with decreasing chain length. In a second step we
                      analyze the approximations that are used when calculating
                      the single chain dynamic structure factor using the Rouse
                      model. For a system like pure PEO, where the dynamics follow
                      the predicted Rouse behavior, excellent agreement is
                      achieved. In the case of PEO in PMMA, however, the slow PMMA
                      matrix strongly influences the PEO dynamics. As a result,
                      the distribution functions show a strong non-Gaussianity,
                      and the calculation of S(Qt) using the Rouse approximation
                      fails even considering nonexponential Rouse mode
                      correlators.},
      keywords     = {J (WoSType)},
      cin          = {ICS-1 / Jülich Centre for Neutron Science JCNS (JCNS) ;
                      JCNS / JCNS-1 / JCNS (München) ; Jülich Centre for Neutron
                      Science JCNS (München) ; JCNS-FRM-II},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-20121112 /
                      I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung / Großgeräte für die Forschung
                      mit Photonen, Neutronen und Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK505 / G:(DE-Juel1)FUEK415},
      experiment   = {EXP:(DE-MLZ)J-NSE-20140101},
      shelfmark    = {Polymer Science},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000298905000057},
      doi          = {10.1021/ma2016634},
      url          = {https://juser.fz-juelich.de/record/19755},
}