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Long-range ordered structures in diblock copolymer melts induced by combined external fields.

Jie Feng1, Eli Ruckenstein

  • 1Department of Chemical and Biological Engineering, State University of New York at Buffalo, Buffalo, New York 14260-4200, USA.

The Journal of Chemical Physics
|July 21, 2004
PubMed
Summary
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External fields like electric and shear can control diblock copolymer structures. Simultaneous fields are more effective than sequential ones for forming lamellae in symmetric systems.

Area of Science:

  • Polymer Science
  • Materials Science
  • Soft Matter Physics

Background:

  • Diblock copolymers exhibit complex phase behavior.
  • External fields can influence polymer self-assembly.
  • Understanding field-induced structures is crucial for materials design.

Purpose of the Study:

  • Investigate diblock copolymer melt structures under single and combined orthogonal fields.
  • Determine the phase structure by coupling field effects with bulk properties.
  • Examine dynamical processes under orthogonal fields.

Main Methods:

  • Utilized a cell dynamic system simulation.
  • Applied single electric and shear fields.
  • Investigated combined orthogonal electric and shear fields (sequential and simultaneous).

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Main Results:

  • Single fields induced long-range cylinders (asymmetric A4mB6m) or distorted lamellae (symmetric A5mB5m).
  • Sequential orthogonal shear followed by electric fields formed long-range lamellae in symmetric systems.
  • Simultaneous orthogonal fields more readily formed long-range lamellae than sequential fields.

Conclusions:

  • External electric and shear fields effectively control diblock copolymer morphology.
  • Simultaneous orthogonal fields offer a more efficient route to lamellar structures compared to sequential application.
  • The study provides insights into the dynamics of field-induced phase transitions in copolymer melts.