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@ARTICLE{Zorn:860917,
      author       = {Zorn, Reiner and Yin, Huajie and Lohstroh, Wiebke and
                      Harrison, Wayne and Budd, Peter M. and Pauw, Brian R. and
                      Böhning, Martin and Schönhals, Andreas},
      title        = {{A}nomalies in the low frequency vibrational density of
                      states for a polymer with intrinsic microporosity – the
                      {B}oson peak of {PIM}-1},
      journal      = {Physical chemistry, chemical physics},
      volume       = {20},
      number       = {3},
      issn         = {1463-9084},
      address      = {Cambridge},
      publisher    = {RSC Publ.66479},
      reportid     = {FZJ-2019-01569},
      pages        = {1355 - 1363},
      year         = {2018},
      abstract     = {Polymers with intrinsic microporosity are promising
                      candidates for the active separation layer in gas separation
                      membranes. Here, the vibrational density of states (VDOS)
                      for PIM-1, the prototypical polymer with intrinsic
                      microporosity, is investigated by means of inelastic neutron
                      scattering. The results are compared to data measured for a
                      more conventional high-performance polyimide used in gas
                      separation membranes (Matrimid). The measured data show the
                      characteristic low frequency excess contribution to VDOS
                      above the Debye sound wave level, generally known as the
                      Boson peak in glass-forming materials. In comparison to the
                      Boson peak of Matrimid, that of PIM-1 is shifted to lower
                      frequencies. This shift is discussed considering the
                      microporous, sponge-like structure of PIM-1 as providing a
                      higher compressibility at the molecular scale than for
                      conventional polymers. For an annealed PIM-1 sample, the
                      Boson peak shifts to higher frequencies in comparison to the
                      un-annealed sample. These changes in the VDOS of the
                      annealed PIM-1 sample are related to changes in the
                      microporous structure as confirmed by X-ray scattering.},
      cin          = {ICS-1 / Neutronenstreuung ; JCNS-1 / JCNS-FRM-II},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      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},
      experiment   = {EXP:(DE-MLZ)TOF-TOF-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:29255828},
      UT           = {WOS:000423019600005},
      doi          = {10.1039/C7CP07141H},
      url          = {https://juser.fz-juelich.de/record/860917},
}