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@ARTICLE{Schwahn:129128,
      author       = {Schwahn, Dietmar and Pipich, Vitaliy and Richter, Dieter},
      title        = {{C}omposition and long-range {D}ensity {F}luctuations in
                      {PEO}/{PMMA} {P}olymer {B}lends - a {R}esult of asymmetric
                      {C}omponent {M}obility},
      journal      = {Macromolecules},
      volume       = {45},
      number       = {4},
      issn         = {1520-5835},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2013-00648},
      pages        = {2035-2049},
      year         = {2012},
      abstract     = {Fluctuations of density and composition were observed in
                      the disordered regime of a symmetric poly(ethylene oxide)
                      (PEO) and a poly(methyl methacrylate) (PMMA) polymer blend.
                      This blend is of particular interest as the glass transition
                      (TG) of both polymers happens at very different temperatures
                      thereby inducing a dynamic asymmetry in the molecular
                      dynamics. Small-angle neutron scattering and oscillatory
                      shear rheology were the principle experimental tools.
                      Composition fluctuations determined the Flory–Huggins
                      parameter as well as glass and gelation temperature (TA).
                      The density fluctuations are of long-range and show a mass
                      fractal dimension whose strength enlarges below the glass
                      transition. A fairly constant TA about 40 K above TG
                      separates two regions of distinctively different fluctuation
                      behavior. A comparison of viscoelastic plateau modulus and
                      high frequency modulus determined from rheology and SANS
                      show that the relaxation modes in the regime between TG and
                      TA are determined by the freezing segmental modes of PMMA.},
      cin          = {Neutronenstreuung ; JCNS-1 / JCNS (München) ; Jülich
                      Centre for Neutron Science JCNS (München) ; JCNS-FRM-II /
                      ICS-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)ICS-1-20110106},
      pnm          = {451 - Soft Matter Composites (POF2-451) / 54G - JCNS
                      (POF2-54G24) / 544 - In-house Research with PNI (POF2-544)},
      pid          = {G:(DE-HGF)POF2-451 / G:(DE-HGF)POF2-54G24 /
                      G:(DE-HGF)POF2-544},
      experiment   = {EXP:(DE-MLZ)KWS1-20140101 / EXP:(DE-MLZ)KWS2-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000300757000034},
      doi          = {10.1021/ma2019123},
      url          = {https://juser.fz-juelich.de/record/129128},
}