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Related Experiment Videos

Spin-coated polyethylene films probed by single molecules.

A C Wirtz1, C Hofmann, E J J Groenen

  • 1Molecular Nano-Optics and Spins (MoNOS), Huygens Laboratory, Leiden University, PO Box 9504, 2300 RA Leiden, The Netherlands.

The Journal of Physical Chemistry. B
|October 27, 2006
PubMed
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Single-molecule spectroscopy reveals that ultrathin high-density polyethylene films exhibit unique molecular orientations. This finding challenges traditional models and suggests a distinct "shish-kebab" crystal structure in these polymer films.

Area of Science:

  • Polymer Physics
  • Materials Science
  • Spectroscopy

Background:

  • High-density polyethylene (HDPE) films are crucial in various applications.
  • Understanding molecular orientation in ultrathin polymer films is key to controlling material properties.
  • Previous studies often assumed spherulitic morphology in polyethylene films.

Purpose of the Study:

  • To investigate the molecular orientation of dopant molecules in ultrathin HDPE films.
  • To compare orientation in high-density versus low-density polyethylene films.
  • To elucidate the underlying crystal structure responsible for observed orientations.

Main Methods:

  • Single-molecule spectroscopy and microscopy at cryogenic temperatures (1.8 K).
  • Doping of ultrathin (100-200 nm) spin-coated HDPE films with 2,3,8,9-dibenzanthanthrene (DBATT) molecules.

Related Experiment Videos

  • Analysis of DBATT probe molecule orientation distributions.

    • Main Results:

    • DBATT probe molecules in HDPE films show a marked difference in orientation compared to low-density films.
    • A preferential orientation along two perpendicular directions was observed.
    • These orientations were stable over distances of at least 2 mm.

    Conclusions:

    • The observed strong orientation preference indicates abundant lateral crystal faces.
    • The results are inconsistent with a spherulitic morphology.
    • A
    • shish-kebab
    • crystal structure is proposed to explain the findings in ultrathin HDPE films.