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Orientation mapping of semicrystalline polymers using scanning electron nanobeam diffraction.

Ouliana Panova1, X Chelsea Chen2, Karen C Bustillo3

  • 1Department of Materials Science and Engineering, University of California, Berkeley, CA, USA; National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.

Micron (Oxford, England : 1993)
|June 21, 2016
PubMed
Summary

We developed a scanning electron nanobeam diffraction technique to map nanoscale crystalline regions in polymer blends. This method reveals crystallite size, distribution, orientation, and crystallinity degree.

Keywords:
Crystal orientationDiffractionLocally resolved structureP3HTPolymersSTEMSpatially resolvedTEM

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Characterizing nanoscale crystalline regions in polymer blends is crucial for understanding material properties.
  • Existing techniques may have limitations in simultaneously assessing size, distribution, orientation, and crystallinity.

Purpose of the Study:

  • To demonstrate a scanning electron nanobeam diffraction technique for detailed nanoscale analysis of polymer blends.
  • To map the size, distribution, relative orientation, and degree of crystallinity of nanoscale crystalline regions.

Main Methods:

  • Utilized a scanning electron nanobeam diffraction technique.
  • Employed a rastering electron beam across a model polymer blend (50:50 poly(3-hexylthiophene-2,5-diyl) (P3HT) and polystyrene (PS)).
  • Acquired diffraction images at each probe position, followed by image alignment and filtering.

Main Results:

  • Successfully mapped the size and distribution of nanoscale crystalline regions in the P3HT:PS blend.
  • Determined the relative orientation of individual crystallites.
  • Quantified the degree of crystallinity within the scanned area.
  • Constructed an orientation map of the crystalline regions.

Conclusions:

  • The demonstrated scanning electron nanobeam diffraction technique is effective for comprehensive nanoscale characterization of polymer blends.
  • This technique provides valuable insights into the morphology and crystallinity of semicrystalline polymers.
  • The method enables detailed mapping of crystalline structures at the nanoscale.