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Zum Mechanismus der Polymerkristallisation

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Zusammenfassung

Auf der Grundlage der Ergebnisse von Röntgenkleinwinkel-Streuexperimenten und elektroenenmikroskopischen Untersuchungen an verzweigtem Polyethylen wird ein neues Modell zum Ablauf des partiellen Kristallisierens und Schmelzens entwickelt. Im Modell wird der Aufbau der Lamellarstruktur als sukzessive „Einschubkristallisation“ beschrieben, die durch die Konzentration an nichtkristallisierfähigen Einheiten in den amorphen Bereichen gesteuert wird. Die Kinetik der Einschubkristallisation läßt sich durch dilatometrische Experimente verfolgen. Aus vergleichenden Röntgenkleinwinkel- und Ramanstreuexperimenten kann auf eine Anreicherung der Cobausteine an den Lamellenoberflächen geschlossen werden.

Summary

The results of small angle X-ray scattering experiments and electron microscopic investigations on branched polyethylene suggest a new model of partial crystallization and melting. The formation of lamellar structures is described as a consecutive process (“insertion crystallization”) controlled by the concentration of non-crystallizable units in the amorphous layers. Crystallization kinetics upon stepwise cooling is investigated by dilatometry. Comparison of low angle X-ray scattering and Raman spectroscopic results provides evidence for a accumulation of comonomer units at the lamellar surfaces.

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Author information

Author notes

  1. G. R. Strobl, T. Engelke, H. Meier & G. Urban

    Present address: Institut für Physikalische Chemie der Universität Mainz, Deutschland

Authors and Affiliations

  1. Hamburg

    H. G. Zachmann

  2. Berlin

    R. Hosemann

  3. Geleen

    V. Mathot

Authors
  1. G. R. Strobl
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  2. T. Engelke
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  3. H. Meier
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  4. G. Urban
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  5. H. G. Zachmann
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  6. R. Hosemann
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  7. V. Mathot
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Additional information

Preprint zur 30. Hauptversammlung der Kolloid-Gesellschaft, 6.–9. Oktober 1981 in Ulm.

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Strobl, G.R., Engelke, T., Meier, H. et al. Zum Mechanismus der Polymerkristallisation. Colloid & Polymer Sci 260, 394–403 (1982). https://doi.org/10.1007/BF01448145

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  • DOI: https://doi.org/10.1007/BF01448145

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