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Related Experiment Videos

Correlated disorder in random block copolymers.

Harry Westfahl1, Jörg Schmalian

  • 1Laboratorio Nacional de Luz Sncrotron--ABTLuS, Campinas, São Paulo, Brazil.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 11, 2005
PubMed
Summary

Adding disorder to diblock copolymers can shift their transition from ordered lamellar structures to disordered glassy states. This occurs due to strong randomness dominating the system, especially in longer polymer chains.

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Area of Science:

  • Polymer Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • Diblock copolymers exhibit microphase segregation leading to ordered states.
  • Near a structural glass transition, random Flory-Huggins parameters are expected.
  • Fluctuations can induce weak first-order transitions in clean systems.

Purpose of the Study:

  • Investigate the impact of quenched disorder on diblock copolymer phase transitions.
  • Determine the critical disorder strength for altered transition behavior.
  • Analyze the emergence of glassy states versus ordered lamellar structures.

Main Methods:

  • Renormalization group approach.
  • Replica trick for quenched disorder analysis.
  • Theoretical modeling of polymer chain length effects.

Main Results:

  • A critical disorder strength, dependent on polymer chain length, was identified.
  • Beyond this critical strength, the transition shifts from lamellar to glassy.
  • Strong randomness and nonlocal disorder correlations dominate the system.

Conclusions:

  • Disorder fundamentally alters diblock copolymer phase behavior.
  • Chain length influences the role of critical fluctuations and transition type.
  • Glassy states emerge from strong randomness in copolymer melts.

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