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Self-organization of polystyrenes into ordered microstructured films and their replication by soft lithography
A Bolognesi1, C Mercogliano, S Yunus
1Istituto per lo Studio delle Macromolecole, CNR, Via E. Bassini 15, 20133 Milano, Italy.
Langmuir : the ACS Journal of Surfaces and Colloids
|April 6, 2005
Summary
Ordered arrays of micrometric holes form on polystyrene films via solvent evaporation under humidity. Polar groups on polystyrene are key to creating honeycomb structures for photonic crystals and organic electronics.
Area of Science:
- Materials Science
- Polymer Science
- Surface Chemistry
Background:
- Ordered microstructures are crucial for advanced materials.
- Polystyrene films are widely used but often lack controlled surface morphology.
Purpose of the Study:
- To investigate the formation of ordered microstructures on polystyrene films.
- To understand the role of film casting conditions and polymer properties.
Main Methods:
- Casting polystyrene films from volatile solvents with controlled humidity and temperature.
- Investigating polystyrene with varying molecular weights, polydispersities, and terminations.
- Analyzing film morphology using microscopy.
- Replicating structures using soft lithography.
Main Results:
- Formation of ordered arrays of micrometric holes, including a regular honeycomb morphology.
- Identification of polar groups and surface tension as critical factors in microstructure formation.
- Demonstration of tunable film morphology (2D and 3D) by modifying polar terminations.
Conclusions:
- Humidity-induced solvent evaporation can create ordered microstructures on polystyrene films.
- Dicarboxy-terminated polystyrene yields highly regular honeycomb patterns.
- These microstructures are promising for applications in photonic crystals and organic electronics.
