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@ARTICLE{Campanella:808950,
      author       = {Campanella, Antonella and Brás, A. and Raftopoulos, K. N.
                      and Papadakis, C. M. and Vassiliadou, O. and Kyritsis, A.
                      and Appavou, M. S. and Müller-Buschbaum, P. and
                      Frielinghaus, H.},
      title        = {{D}ielectric relaxations of nanocomposites composed of
                      {HEUR} polymers and magnetite nanoparticles},
      journal      = {Polymer},
      volume       = {96},
      issn         = {0032-3861},
      address      = {Oxford},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2016-02462},
      pages        = {70-80},
      year         = {2016},
      abstract     = {We investigate the dynamics of nanocomposites composed of
                      hydrophobically modified ethoxylated urethanes (HEUR) and
                      magnetite nanoparticles (MNPs) as dry films. Weemployed
                      dielectric relaxation spectroscopy (DRS) in combination with
                      differential scanning calorimetry (DSC) and thermally
                      stimulated depolarization currents (TSDC).The three
                      techniques reveal a strong heterogeneity of the matrix of
                      the nanocomposites, consisting of (i) a crystalline
                      poly(ethyleneoxide) PEO bulk phase, (ii) an amorphous PEO
                      portion, and (iii) small PEO crystallites which experience
                      different constraints than the PEO bulk phase. TSDC and DRS
                      reveal a very high direct current (DC)-conductivity of the
                      pure matrix, which increases with MNPs concentration. The
                      increase of the DCconductivity is not related to an increase
                      of the segmental mobility, but most likely to the change of
                      the morphology of the hydrophobic domains of the polymer
                      matrix, due to the formation of large MNPs clusters. Indeed,
                      the MNPs neither influence the segmental dynamics of the
                      polymer nor the phase behavior of the polymer matrix. The
                      addition of MNPs slightly increases the activation energy
                      related to the γ-relaxation of the polymer. This effect
                      might be related to the changes in nano-morphology as
                      demonstrated by the slight increase of the degree of
                      crystallinity. The analysis of the DRS data with the
                      electrical modulus M’’(ω) and the derivative
                      ε’’der formalism allow us to identify a low-frequency
                      process in addition to the conductivity relaxation. This
                      low-frequency dispersion is also revealed by TSDC. It is
                      most likely related to the Maxwell-Wagner- Sillars
                      relaxation, which typically occurs in systems which feature
                      phase separation. The detailed investigation of the
                      dielectric properties of these novel nanocomposites with
                      increasing MNPs concentration will be useful for their
                      practical application, for example as absorbers of
                      electromagnetic waves.},
      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) / 6215 - Soft Matter,
                      Health and Life Sciences (POF3-621)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF3-6215},
      experiment   = {EXP:(DE-MLZ)TEM-MLZ-20151210},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000376728300010},
      doi          = {10.1016/j.polymer.2016.04.045},
      url          = {https://juser.fz-juelich.de/record/808950},
}