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@ARTICLE{Arbe:10767,
      author       = {Arbe, A. and Genix, A.-C. and Arrese-Igor, S. and
                      Colmenero, J. and Richter, D.},
      title        = {{D}ynamics in poly(n-alkyl methacrylates): {A} neutron
                      scattering, calorimetric and dielectric study},
      journal      = {Macromolecules},
      volume       = {43},
      number       = {6},
      issn         = {0024-9297},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {PreJuSER-10767},
      pages        = {3107 - 3119},
      year         = {2010},
      note         = {We thank the Institut Laue-Langevin (ILL) in Grenoble
                      (France) for neutron scattering facilities and the ILL
                      scientists P. Fouqttet, M. Maccarini, B. Deme, and P. P.
                      Deen for experimental help at the ILL. We are also thankful
                      to Prof. A. Alegria for fruitful discussions. This research
                      project has been supported by the European Commission NOE
                      SoftComp, Contract NMP3-CT-2004-502235, the "Donostia
                      International Physics Center". A.A. and J.C. acknowledge
                      support from the projects MAT2007-63681, IT-436-07 (GV), and
                      the Spanish Ministerio de Educacion y Ciencia (Grant
                      CSD2006-53).},
      abstract     = {Combining neutron diffraction, neutron spin echo,
                      differential scanning calorimetry, and dielectric
                      spectroscopy, we have investigated the structure and
                      dynamics of poly(n-butyl methacrylate) (PBMA) and
                      poly(n-hexyl methacrylate) (PHMA). Signatures of the
                      occurrence of a glass transition associated with the
                      freezing of the intermolecular correlations within alkyl
                      nanodomains are present in the structural data. Exploiting
                      isotopic labeling, neutron scattering has revealed
                      collective dynamics at the main-chain and side-group levels
                      for both polymers and the self-motions of hydrogen atoms in
                      the side groups of PHMA, adding valuable microscopic
                      information to comprehensive relaxation maps and putting the
                      relaxation results into a perspective. Moreover, we find
                      exotic dynamical behavior for the side groups, characterized
                      by extremely stretched (nearly logarithmic-like) decays of
                      the correlation functions. For PHMA, a complete dynamical
                      decoupling of side-group dynamics from the main-chain
                      motions is found. The side groups of this polymer show an
                      extremely "strong" temperature dependence of the structural
                      relaxation time and much faster characteristic times for
                      self than collective motions. The analogies found between
                      the self-motions of the side-group H atoms in PHMA and the
                      gamma-relaxation process in semicrystalline polyethylene
                      (PE) strengthen the picture of confined PE-like dynamics
                      within alkyl nanodomains. We discuss possible origins for
                      the observed phenomenology.},
      keywords     = {J (WoSType)},
      cin          = {IFF-5 / IFF-4 / Jülich Centre for Neutron Science JCNS
                      (JCNS) ; JCNS},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB785 / I:(DE-Juel1)VDB784 /
                      I:(DE-Juel1)JCNS-20121112},
      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},
      shelfmark    = {Polymer Science},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000275711300057},
      doi          = {10.1021/ma902833h},
      url          = {https://juser.fz-juelich.de/record/10767},
}