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Exploring Pathways to Equilibrate Langmuir Polymer Films.

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Investigating poly(l-lactide) Langmuir films, this study reveals that achieving equilibrium in phase coexistence is challenging. Recompression after expansion can induce self-seeding, altering film morphology and reducing surface pressure.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Surface Chemistry

Background:

  • Langmuir films of poly(l-lactide) exhibit complex behavior in their phase-coexistence region.
  • Nonequilibrated morphologies and non-ideal isotherms are observed due to experimental pathways.
  • Previous work identified coexisting mesoscopic clusters and a matrix phase in this region.

Purpose of the Study:

  • To investigate changes in nonequilibrated morphologies and isotherms in poly(l-lactide) Langmuir films.
  • To understand the impact of different compression and expansion pathways on film behavior.
  • To explore the possibility of achieving thermodynamic equilibrium in polymer Langmuir films.

Main Methods:

  • Utilizing Langmuir film techniques with controlled lateral compression and expansion.
  • Monitoring surface pressure (Π) and isotherm changes under varying experimental conditions.
  • Employing microscopic techniques to observe morphological transformations (as referenced from prior work).

Main Results:

  • Surface pressure (Π) in the coexistence region exceeded equilibrium values and increased with compression.
  • Slowing compression rates or increasing waiting times reduced surface pressure, indicating relaxation.
  • Recompressing films after prior compression-expansion cycles, starting below the coexistence onset, led to significant pressure reduction via 'self-seeding'.
  • This self-seeding induced a morphological transformation from metastable clusters to favored filamentary structures.

Conclusions:

  • Fully equilibrated coexisting phases in poly(l-lactide) Langmuir films are practically unattainable.
  • Experimental pathways, including compression rate and waiting times, significantly influence film morphology and pressure.
  • The 'self-seeding' phenomenon offers a route to influence morphology and reduce surface pressure in polymer Langmuir films.