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Early oriented isothermal crystallization of polyethylene studied by high-time-resolution SAXS/WAXS

  • N. Stribeck
  • A. Almendarez Camarillo
  • U. Nöchel
  • P. Bösecke
  • R. K. Bayer
Original Paper

Abstract

During cooling from the quiescent melt of a highly oriented polyethylene rod, highly oriented proto-lamellae are formed first, which are not crystalline. This is shown in scattering data which are recorded on two-dimensional detectors with a cycle time of 1 s and an exposure of 0.1 s. In the experiments small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS) are registered simultaneously during the first 3 min after quenching to a crystallization temperature. A non-uniform thickness between 20 and 100 nm is characteristic for the ensemble of proto-lamellae. During the first minute of isothermal treatment the number of proto-lamellae slowly increases without a change of the thickness distribution. As crystallization starts, the crystallites are not oriented in contrast to the proto-lamellae. During crystallization the layer thickness distribution narrows. The number of lamellae rapidly increases during the following 2 min of isothermal treatment (at 128 °C and 124 °C). The results are obtained by interpretation of the WAXS and of the multidimensional chord distribution function (CDF), a model-free real-space visualization of the nanostructure information contained in the SAXS data.

Keywords

SAXS Polyethylene Crystallization 

Notes

Acknowledgments

We acknowledge the support of Dipl. Ing. F. Tschöpe concerning the high-pressure injection-molding and the European Synchrotron Radiation Facility (ESRF), Grenoble, France for provision of the synchrotron radiation facilities at beamline ID02 in the frame of project SC-1679. Financial support of this study by the Deutsche Forschungsgemeinschaft (DFG STR501/4-1) is gratefully acknowledged.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • N. Stribeck
    • 1
  • A. Almendarez Camarillo
    • 1
  • U. Nöchel
    • 1
  • P. Bösecke
    • 2
  • R. K. Bayer
    • 3
  1. 1.Institute of Technical and Macromolecular ChemistryUniversity of HamburgHamburgGermany
  2. 2.ESRFGrenoble Cedex 9France
  3. 3.Institut für WerkstofftechnikUniversität GH KasselKasselGermany

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