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@ARTICLE{Nusser:19069,
      author       = {Nusser, K. and Schneider, G.J. and Pyckhout-Hintzen, W. and
                      Richter, D.},
      title        = {{V}iscosity decrease and reinforcement in
                      polymer-silsesquioxane composites},
      journal      = {Macromolecules},
      volume       = {44},
      issn         = {0024-9297},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {PreJuSER-19069},
      pages        = {7820 - 7830},
      year         = {2011},
      note         = {The authors thank L. Willner for the used polymers and A.
                      Radulescu for assistance at the JCNS SANS instrument KWS-2.
                      K.N. acknowledges the financial support of the Evonik
                      Stiftung.},
      abstract     = {The rheological behavior of poly(ethylene-alt-propylene)
                      (PEP), polydimethylsiloxane (PDMS) and polyisoprene (PI, two
                      molecular weights: 70k and 200k) melts containing polyhedral
                      oligomeric silsesquioxane (POSS) molecules was investigated
                      by means of small angle scattering (SAXS and SANS) and
                      oscillatory shear rheology. The dependence of the
                      nanocomposite viscosity on the polymer-particle solubility
                      and polymer molecular weight was studied. At high filler
                      fractions all polymers exhibited hydrodynamic reinforcement
                      of the plateau modulus quantified by a Guth Gold relation.
                      Additionally, the PEP and PI70k systems showed a transition
                      from liquid like to solid like rheological behavior. SAXS
                      results enabled us to relate this behavior to the formation
                      of a POSS network or POSS particle jamming, respectively. At
                      low filler degrees, the zero shear viscosity of the
                      nanocomposites was strongly dependent on the polymer
                      solubility and entanglement number. We observed a viscosity
                      decrease in the filled PDMS and PI200k samples, a constant
                      viscosity in the PEP samples and regular reinforcement in
                      the PI70k samples. These results are compared to the
                      predictions of regular plasticization, and then
                      quantitatively discussed in terms of the recently proposed
                      model by Ganesan and Pyramitsyn, as well as the model by
                      Wang and Hill. In particular the latter is shown to
                      constitute a suitable means to quantify the results in terms
                      of a layer of reduced polymer viscosity surrounding each
                      nanoparticle.},
      keywords     = {J (WoSType)},
      cin          = {ICS-1 / JCNS (München) ; Jülich Centre for Neutron
                      Science JCNS (München) ; JCNS-FRM-II / JCNS-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-1-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      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)KWS2-20140101},
      shelfmark    = {Polymer Science},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000295487600039},
      doi          = {10.1021/ma201585v},
      url          = {https://juser.fz-juelich.de/record/19069},
}