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Related Experiment Videos

Why do polyethylene crystals have sectors?

D L Dorset1, J Hanlon, C H McConnell

  • 1Electron Diffraction Department, Medical Foundation of Buffalo, Inc., Buffalo, NY 14203, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 1, 1990
PubMed
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High-resolution electron microscopy reveals n-paraffin crystals exhibit sectorization based on molecular packing, not chain folding. This finding impacts understanding of polymer crystallization and crystal structure.

Area of Science:

  • Materials Science
  • Polymer Science
  • Crystallography

Background:

  • Understanding the crystallization behavior of n-paraffins is crucial for polymer science.
  • Previous studies on n-paraffins have focused on chain folding and its impact on crystal morphology.
  • The role of molecular packing versus chain folding in crystal sectorization remains an area of investigation.

Purpose of the Study:

  • To investigate the relationship between molecular packing and crystal sectorization in n-paraffin monolamellar crystals.
  • To determine the influence of chain length on crystal structure and molecular arrangement.
  • To explore the effect of surface morphology on crystal growth and orientation.

Main Methods:

  • High-resolution electron microscopy (3.7 Å optical diffraction) was employed to image n-paraffin crystals.

Related Experiment Videos

  • Specimens with varying chain lengths (n-C36H74 to n-C82H166) were analyzed.
  • Surface decoration with polyethylene crystallites was used to probe surface structure and preferred orientations.

    • Main Results:

    • Higher molecular weight n-paraffins (>n-C60H122) form sectorized crystals with alternate bands of untilted and tilted chains.
    • Lower molecular weight n-paraffins form nonsectorized crystals with generally untilted chains.
    • Surface decoration revealed three preferred polyethylene crystal rod orientations on longer alkanes, suggesting a role for surface roughness.

    Conclusions:

    • Crystal sectorization in n-paraffins is primarily a function of chain-stem packing, not solely dependent on chain folding.
    • Chain folds may play a secondary role, potentially influencing crystal collapse on surfaces.
    • The study provides new insights into the fundamental principles governing polymer crystallization and morphology.