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@PHDTHESIS{Hedesiu:49913,
      author       = {Hedesiu, Cristian Eugen},
      othercontributors = {Blümich, Bernhard},
      title        = {{S}tructure property relationships in polyolefins},
      address      = {Aachen},
      publisher    = {Publikationsserver der RWTH Aachen University},
      reportid     = {RWTH-CONV-112481},
      pages        = {135 S. : Ill., graph. Darst.},
      year         = {2007},
      note         = {Prüfungsjahr: 2007. - Publikationsjahr: 2008; Aachen,
                      Techn. Hochsch., Diss., 2007},
      abstract     = {Changes in the amount of the rigid, semi-rigid, and soft
                      fractions, chain dynamics, and domain thickness of isotactic
                      polypropylene (iPP) were investigated as a function of
                      temperature, storage temperature, storage time, draw ratio,
                      drawing temperature, drawing rate, ethylene propylene rubber
                      content and addition of nucleating agents. Those changes are
                      studied with high sensitivity using low and high field solid
                      state nuclear magnetic resonance (NMR), transmission
                      electron microscopy (TEM), differential scanning calorimetry
                      (DSC), infrared spectroscopy (IR) and X-ray diffraction
                      (XRD). The results obtained by NMR are in good agreement
                      with those measured by the above techniques. The small
                      difference between the results can be quantitatively
                      explained by the presence of interface which is not taken
                      into account in DSC, IR, TEM and XRD data analysis. The
                      structural changes due to storage time and temperature are
                      considered to be associated with a molecular rearrangement
                      generally similar to secondary crystallization accompanied
                      by a decrease in segmental chain mobility of the amorphous
                      chains involved in the diffusion process. A decrease in the
                      chain mobility has been observed in all fractions with
                      increasing the drawing rate, draw ratio, and drawing
                      temperature. The increase in the thickness of the lamellae
                      with increasing draw ratio and drawing temperature can be
                      explained by partial melting and recrystallization, as well
                      as immobilization of the amorphous phase. A decrease in the
                      heat of fusion, yield stress, flexural modulus has been
                      observed with increasing rubber content. The addition of
                      nucleating agents however, caused an increase in the
                      crystallization temperature, heat of fusion, yield stress,
                      flexural modulus, and rigid fraction.},
      keywords     = {Magnetische Kernresonanz (SWD) / Kernspinrelaxation (SWD) /
                      Polypropylen (SWD) / Polyethylene (SWD) /
                      Durchstrahlungselektronenmikroskopie (SWD)},
      cin          = {150000 / 154810},
      ddc          = {530},
      cid          = {$I:(DE-82)150000_20140620$ / $I:(DE-82)154810_20140620$},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hbz:82-opus-21258},
      url          = {https://publications.rwth-aachen.de/record/49913},
}