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@ARTICLE{Jalarvo:255676,
      author       = {Jalarvo, N. and Pramanick, A. and Do, C. and Diallo, S. O.},
      title        = {{E}ffects of configurational changes on molecular dynamics
                      in polyvinylidene fluoride and poly(vinylidene
                      fluoride-trifluoroethylene) ferroelectric polymers},
      journal      = {Applied physics letters},
      volume       = {107},
      number       = {8},
      issn         = {1077-3118},
      address      = {Melville, NY},
      publisher    = {American Inst. of Physics},
      reportid     = {FZJ-2015-05809},
      pages        = {082907},
      year         = {2015},
      abstract     = {We present a comparative study of proton dynamics in
                      unpoled non-ferroelectric polymer polyvinylidene fluoride
                      (PVDF) and in its trifluoroethylene containing ferroelectric
                      copolymer (with 70/30 molar proportion), using quasi-elastic
                      neutron scattering. The neutron data reveal the existence of
                      two distinct types of molecular motions in the temperature
                      range investigated. The slower motion, which is
                      characterized in details here, is ascribed to protons jump
                      diffusion along the polymeric carbon chains, while the
                      faster motion could be attributed to localized rotational
                      motion of methylene groups. At temperatures below the Curie
                      point (Tc  ∼ 385 K) of the composite polymer, the
                      slower diffusive mode experiences longer relaxation times in
                      the ferroelectric blend than in the bare PVDF, although the
                      net corresponding diffusion coefficient remains
                      comparatively the same in both polymers with characteristic
                      activation energy of EA  ≈ 27–33 kJ/mol. This
                      arises because of a temperature dependent jump length r 0,
                      which we observe to be effectively longer in the copolymer,
                      possibly due to the formation of ordered ferroelectric
                      domains below Tc . Above Tc , there is no appreciable
                      difference in r 0 between the two systems. This observation
                      directly relates the known dependence of Tc on molar ratio
                      to changes in r 0, providing fundamental insight into the
                      ferroelectric properties of PVDF-based copolymers.},
      cin          = {ICS-1 / Neutronenstreuung ; JCNS-1 / JCNS-SNS},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-SNS-20110128},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551) /
                      6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6215 - Soft Matter, Health and Life Sciences (POF3-621)},
      pid          = {G:(DE-HGF)POF3-551 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF3-6215},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000360593900057},
      doi          = {10.1063/1.4929693},
      url          = {https://juser.fz-juelich.de/record/255676},
}