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@ARTICLE{Ohrt:201071,
      author       = {Ohrt, Christian and Koschine, Tönjes and Rätzke, Klaus
                      and Faupel, Franz and Willner, Lutz and Schneider, Gerald
                      J.},
      title        = {{F}ree volume in {PEP}-silica nanocomposites with varying
                      molecular weight},
      journal      = {Polymer},
      volume       = {55},
      number       = {1},
      issn         = {0032-3861},
      address      = {Oxford},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2015-03381},
      pages        = {143 - 149},
      year         = {2014},
      abstract     = {The influence of confinement in polymer-nanocomposites on
                      free volume and glass transition of the polymer chains was
                      studied. The molecular weight (Mw) of
                      poly(ethylene-alt-propylene) (PEP) was varied from 3k to
                      200k and so the end-to end distance of the chains at fixed
                      diameter (∼15 nm) and concentration $(15\%)$ of the silica
                      nanoparticles increased. Thus the topological confinement
                      increases with increasing Mw. Using hydrophobic PEP and
                      particles functionalized with short organic molecules, we
                      can rule out contributions of permanent adsorption of the
                      chains. DSC showed no change in glass transition
                      temperature. The decrease in the specific heat capacity
                      could be explained by a simple mixing rule. By positron
                      annihilation lifetime spectroscopy, taking properly into
                      account contributions of the silica particles, we rule out
                      an influence of the geometrical confinement on the free
                      volume in the PEP nanocomposites studied here.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-54G24},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000330207100018},
      doi          = {10.1016/j.polymer.2013.11.021},
      url          = {https://juser.fz-juelich.de/record/201071},
}