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Polymerization-induced phase separation.

J C Lee1

  • 1Department of Physics and Astronomy, University of Southern Mississippi, Hattiesburg, Mississippi 39406-5046, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|April 24, 2002
PubMed
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This study used molecular dynamics simulations to investigate microphase separation during polymer-dispersed liquid crystal formation. Results show liquid crystal molecules aggregate into droplets within a polymer gel, with droplet growth kinetics described by a power law.

Area of Science:

  • Polymer Science
  • Materials Science
  • Soft Matter Physics

Background:

  • Microphase separation is crucial in polymer-dispersed liquid crystal (PDLC) systems.
  • Understanding the kinetics of this process informs material design and property control.

Purpose of the Study:

  • To investigate the kinetics of microphase separation during PDLC formation.
  • To characterize the aggregation behavior of liquid crystal molecules within a polymerizing matrix.

Main Methods:

  • Molecular dynamics (MD) simulations were employed.
  • An equimolar mixture of monomers and liquid crystal molecules was simulated.
  • Monomers were polymerized at a constant temperature.

Main Results:

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  • A spanning polymer gel formed with liquid crystal molecules aggregating into droplets.
  • The droplet growth kinetics were characterized by a power law, with a growth exponent of approximately t(-0.23).
  • The observed aggregation and growth kinetics are attributed to the developing elastic properties of the gel and entropy-driven forces.

Conclusions:

  • The study elucidates the kinetic pathways of microphase separation in PDLC formation.
  • Droplet aggregation in this system is primarily driven by entropic forces.
  • The findings provide insights into controlling PDLC morphology through polymerization kinetics.