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Related Experiment Videos

Dislocation-controlled perforated layer phase in a PEO- b-PS diblock copolymer.

L Zhu1, P Huang, S Z Cheng

  • 1Maurice Morton Institute and Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909, USA.

Physical Review Letters
|June 21, 2001
PubMed
Summary

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Shear forces create a hexagonal perforated layer phase in poly(ethylene oxide)-b-polystyrene diblock copolymers. This phase primarily consists of trigonal twins, with a hexagonal structure forming through stacking faults during plastic deformation.

Area of Science:

  • Materials Science
  • Polymer Science
  • Crystallography

Background:

  • Diblock copolymers exhibit complex phase behaviors under external stimuli.
  • Understanding the nanostructure of shear-induced phases is crucial for material design.

Purpose of the Study:

  • To elucidate the crystallographic structure of the shear-induced hexagonal perforated layer phase in poly(ethylene oxide)-b-polystyrene.
  • To determine the formation mechanisms of the constituent trigonal and hexagonal structures.

Main Methods:

  • Small-angle X-ray scattering (SAXS) analyses were employed.
  • Transmission electron microscopy (TEM) was utilized for high-resolution imaging.

Main Results:

  • The hexagonal perforated layer phase is composed of majority trigonal (R3;m) twins and a hexagonal (P6(3)/mmc) structure.

Related Experiment Videos

  • TEM revealed sequential intrinsic stacking faults generate the hexagonal structure.
  • Successive intrinsic stacking faults on neighboring layers, due to plastic deformation, form the trigonal twins.

    • Conclusions:

    • The study reveals the detailed crystallographic nature of a shear-induced polymer nanostructure.
    • Plastic deformation under shear is directly linked to the formation of specific crystallographic twins and structures in diblock copolymers.