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@ARTICLE{Goracci:281716,
      author       = {Goracci, Guido and Arbe, Arantxa and Alegría, Angel and
                      García Sakai, Victoria and Rudić, Svemir and Schneider,
                      Gerald J. and Lohstroh, Wiebke and Juranyi, Fanni and
                      Colmenero, Juan},
      title        = {{I}nfluence of {S}olvent on
                      {P}oly(2-({D}imethylamino){E}thyl {M}ethacrylate) {D}ynamics
                      in {P}olymer-{C}oncentrated {M}ixtures: {A} {C}ombined
                      {N}eutron {S}cattering, {D}ielectric {S}pectroscopy, and
                      {C}alorimetric {S}tudy},
      journal      = {Macromolecules},
      volume       = {48},
      number       = {18},
      issn         = {1520-5835},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2016-01404},
      pages        = {6724 - 6735},
      year         = {2015},
      note         = {"final draft post referee" kann nicht beigebracht werden},
      abstract     = {We have investigated the dynamical
                      processes—α-relaxation, local motions of the side-groups,
                      and methyl group rotations—in poly(2-(dimethylamino)ethyl
                      methacrylate) (PDMAEMA) in the dry state and in mixtures (at
                      70 $wt\%$ polymer concentration) with tetrahydrofuran (THF)
                      and water, to address the question as to how these polymer
                      motions are affected by plasticizers interacting in
                      different ways with the polymer. Differential scanning
                      calorimetry, dielectric spectroscopy, and neutron scattering
                      techniques on labeled samples (with deuterated solvents to
                      isolate the signal of the polymer component) have been
                      combined. The α-relaxation is drastically affected, with
                      similar shifts of the glass-transition temperature for both
                      solvents. Effects of compositional heterogeneities and
                      reduction of the fragility are also observed. On the
                      contrary, methyl-group dynamics are unaffected by the
                      presence of solvent. Regarding side-group local motions
                      (β-relaxation), two kinds of components—a slow and a fast
                      one—could be identified in the dry state. On the basis of
                      the spatial information provided by neutron scattering, a
                      model for the geometry of the motions involved in the fast
                      component has been proposed. Adding solvent, this process
                      would remain essentially unaltered, but the population
                      involved in the slower one would be reduced. With THF as
                      solvent, this reduction would be complete, but with water it
                      would be only partial. This could be attributed to rather
                      heterogeneous distribution of water molecules in the polymer
                      likely associated with the presence of water clusters. Such
                      a scenario would also explain the much more pronounced
                      broadening of the glass-transition region observed for the
                      polymer in the aqueous mixture with respect to that induced
                      by THF.},
      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          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)SPHERES-20140101 /
                      EXP:(DE-MLZ)TOF-TOF-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000361935600040},
      doi          = {10.1021/acs.macromol.5b01316},
      url          = {https://juser.fz-juelich.de/record/281716},
}