Advertisement

Crystallization and Melting of Components in Blends of Polyethylene and Polypropylene

  • J. Grebowicz
  • T. Pakula

Abstract

Blends of polymers are, in most cases, heterogeneous systems in which components partially preserve their individual properties because of the incompatibility of polymers. In blends of semicrystalline polymers, the properties of components are strongly dependent on crystallinity and crystalline morphology. If the crystallizing polymer is dispersed in the blend, its properties are usually different from those in bulk. First of all this can be observed for polymers which crystallize forming supermolecular structures like the spherulites in which crystallization kinetics and resultant morphology are related to temperature dependent nucleation and growth rates of spherulites. In such polymers in the bulk when the nucleation rate is not very high, one nucleus can involve the crystallization in a relatively large volume, i.e. the volume of the final spherulite. In the blend in which the polymer is dispersed into small particles, the range of the influence of an individual nucleus is limited to the size of particles.

Keywords

Differential Scanning Calorimetry Crystallization Kinetic Fast Cool Melting Endotherm Isotactic Polypropylene 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    M. Kryszewski, A. Galeski, T. Pakula and J. Grebowicz, J. Colloid Interface Sci., 44, 85 (1973).CrossRefGoogle Scholar
  2. 2.
    T. Pakula, M. Kryszewski, J. Grebowicz and A Galeski, Polymer J., 6, 94 (1974).CrossRefGoogle Scholar
  3. 3.
    T. Pakula and Z. Soukup, J. Polym. Sci. Phys. Ed., 12, 2437 (1974).CrossRefGoogle Scholar
  4. 4.
    T. Pakula and E. W. Fisher, in preparation.Google Scholar
  5. 5.
    M. Inoue, J. Polym. Sci., Part A, 1, 3427 (1963).Google Scholar
  6. 6.
    R. S.,Stein, F. B. Khambatta, F. P. Warner, T. Russell, A. Escala and E. Balizer, J. Polym. Sci. Polym. Symp., 63, 313 (1978).CrossRefGoogle Scholar
  7. 7.
    M. Avella, R. Greco, E. Martuscelli, G. Mucciariello, M. Pracella and G. Ragosta, “MAKROMAINZ” Preprints of Short Comunications, vol. II, 958, September 1979.Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • J. Grebowicz
    • 1
  • T. Pakula
    • 1
  1. 1.Centre of Molecular and Macromolecular StudiesPolish Academy of SciencesLódźPoland

Personalised recommendations