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@ARTICLE{Kolmangadi:908548,
      author       = {Kolmangadi, Mohamed A. and Szymoniak, Paulina and Zorn,
                      Reiner and Böhning, Martin and Wolf, Marcell and Zamponi,
                      Michaela and Schönhals, Andreas},
      title        = {{M}olecular mobility in high‐performance polynorbornenes:
                      {A} combined broadband dielectric, advanced calorimetry, and
                      neutron scattering investigation*},
      journal      = {Polymer engineering $\&$ science},
      volume       = {62},
      number       = {7},
      issn         = {0032-3888},
      address      = {Hoboken, NJ},
      publisher    = {Wiley},
      reportid     = {FZJ-2022-02672},
      pages        = {2143 - 2155},
      year         = {2022},
      abstract     = {The molecular dynamics of two addition type
                      polynorbornenes, exo-PNBSi and PTCNSi1, bearing
                      microporosity has been investigated by broadband dielectric
                      spectroscopy, fast scanning calorimetry, and neutron
                      scattering. Both polymers have the same side groups but
                      different backbones. Due to their favorable transport
                      properties, these polymers have potential applications in
                      separation membranes for gases. It is established in
                      literature that molecular fluctuations are important for the
                      diffusion of small molecules through polymers. For
                      exo-PNBSi, two dielectric processes are observed, which are
                      assigned to Maxwell/Wagner/Sillars (MWS) process due to
                      blocking of charge carriers at internal voids or pore walls.
                      For PTCNSi1, one MWS-polarization process is found. This
                      points to a bimodal pore-size distribution for exo-PNBSi. A
                      glass transition for exo-PNBSi and for PTCNSi1 could be
                      evidenced for the first time using fast scanning
                      calorimetry. For Tg and the corresponding apparent
                      activation energy, higher values were found for PTCNSi1
                      compared to exo-PNBSi. For both polymers, the neutron
                      scattering data reveal one relaxation process. This process
                      is mainly assigned to methyl group rotation probably
                      overlayed by carbon–carbon torsional fluctuations.},
      cin          = {JCNS-1 / JCNS-FRM-II / JCNS-4 / MLZ},
      ddc          = {670},
      cid          = {I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-4-20201012 / I:(DE-588b)4597118-3},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-MLZ)SPHERES-20140101 /
                      EXP:(DE-MLZ)TOF-TOF-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000787692700001},
      doi          = {10.1002/pen.25995},
      url          = {https://juser.fz-juelich.de/record/908548},
}