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Solvent-induced microphase separation in diblock copolymer thin films with reversibly switchable morphology
Juan Peng1, Yu Xuan, Hanfu Wang
1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China.
The Journal of Chemical Physics
|July 23, 2004
Summary
We explored how solvent vapor treatment affects poly(styrene)-block-poly(methyl methacrylate) diblock copolymer films. The nanostructure morphology can be controlled by annealing time and reversibly switched using different solvents.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Symmetric diblock copolymers self-assemble into ordered nanostructures.
- Controlling nanostructure morphology is crucial for advanced material applications.
Purpose of the Study:
- To investigate the surface morphology of poly(styrene)-block-poly(methyl methacrylate) diblock copolymer thin films.
- To explore the effect of solvent vapor annealing on nanostructure formation.
- To determine if the resulting nanostructures exhibit switchable properties.
Main Methods:
- Solvent vapor annealing using a solvent selective for poly(methyl methacrylate).
- Varying solvent annealing time to control morphology.
- Exposure to different block-selective solvents to test reversibility.
Main Results:
- Highly ordered nanoscale depressions or striped morphologies were achieved.
- Morphology formation was dependent on solvent annealing time.
- The nanostructured films demonstrated reversible switching of morphology and surface properties upon exposure to different solvents.
Conclusions:
- Solvent vapor annealing is an effective method for creating ordered nanostructures in symmetric diblock copolymers.
- The nanostructured films exhibit responsive behavior, allowing for tunable surface properties.
- These switchable nanostructured films hold potential for applications in responsive materials and nanotechnology.