Limits...
Complex microstructures of ABC triblock copolymer thin films directed by polymer brushes based on self-consistent field theory.

Jiang Z, Xu C, Qiu YD, Wang X, Zhou D, Xue G - Nanoscale Res Lett (2014)

Bottom Line: By continuously changing the composition of the block copolymer, the phase diagrams are constructed for three cases with the fixed film thickness and the brush density: identical interaction parameters, frustrated and non-frustrated cases.Some ordered complex morphologies are observed: parallel lamellar phase with hexagonally packed pores at surfaces (LAM3 (ll) -HFs), perpendicular lamellar phase with cylinders at the interface (LAM(⊥)-CI), and perpendicular hexagonally packed cylinders phase with rings at the interface (C2 (⊥)-RI).A desired direction (perpendicular or parallel to the coated surfaces) of lamellar phases or cylindrical phases can be obtained by varying the composition and the interactions between different blocks.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Polymer Science and Engineering, Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.

ABSTRACT
The morphology and the phase diagram of ABC triblock copolymer thin film directed by polymer brushes are investigated by the self-consistent field theory in three dimensions. The polymer brushes coated on the substrate can be used as a good soft template to tailor the morphology of the block copolymer thin films compared with those on the hard substrates. The polymer brush is identical with the middle block B. By continuously changing the composition of the block copolymer, the phase diagrams are constructed for three cases with the fixed film thickness and the brush density: identical interaction parameters, frustrated and non-frustrated cases. Some ordered complex morphologies are observed: parallel lamellar phase with hexagonally packed pores at surfaces (LAM3 (ll) -HFs), perpendicular lamellar phase with cylinders at the interface (LAM(⊥)-CI), and perpendicular hexagonally packed cylinders phase with rings at the interface (C2 (⊥)-RI). A desired direction (perpendicular or parallel to the coated surfaces) of lamellar phases or cylindrical phases can be obtained by varying the composition and the interactions between different blocks. The phase diagram of ABC triblock copolymer thin film wetted between the polymer brush-coated surfaces is very useful in designing the directed pattern of ABC triblock copolymer thin film.

No MeSH data available.


Related in: MedlinePlus

Comparison of the morphology of ABC triblock copolymer confined between hard surfaces and polymer brush-coated substrates. The microphase patterns, displayed in the form of density, are the red, green, and blue, assigned to A, B, and C, respectively. The 3D isosurface graphs are also given for a clear view for the ABC triblock copolymer confined between the hard surfaces. The red, green, and blue colors in isosurface graphs are assigned to the blocks A, B, and C for a good correspondence, respectively. For the ABC triblock copolymer confined between polymer brush-coated substrates, the 3D isosurface of the grafted polymer on the lower substrate is also shown below the morphology due to the symmetry of the polymer brush. For the ABC triblock copolymer confined between hard surfaces, the 3D isosurface is also shown below the morphology.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4120731&req=5

Figure 6: Comparison of the morphology of ABC triblock copolymer confined between hard surfaces and polymer brush-coated substrates. The microphase patterns, displayed in the form of density, are the red, green, and blue, assigned to A, B, and C, respectively. The 3D isosurface graphs are also given for a clear view for the ABC triblock copolymer confined between the hard surfaces. The red, green, and blue colors in isosurface graphs are assigned to the blocks A, B, and C for a good correspondence, respectively. For the ABC triblock copolymer confined between polymer brush-coated substrates, the 3D isosurface of the grafted polymer on the lower substrate is also shown below the morphology due to the symmetry of the polymer brush. For the ABC triblock copolymer confined between hard surfaces, the 3D isosurface is also shown below the morphology.

Mentions: In this part, we give two cases for comparison between the ABC triblock copolymer thin film with and without polymer brush-coated substrates (σ = 0.15) at χABN = χBCN = χACN = 35. In order to simulate the similar interface environment with the ABC triblock copolymer thin film between polymer brush-coated substrates, we set the interaction parameters ηASN = ηCSN = 35 and ηBSN = 0 for the ABC triblock copolymer thin film between hard surfaces, which means the substrate is good for the middle block B. In principle, the effective film thickness for the ABC triblock copolymer thin film confined between the polymer brush-coated substrates is like Lzeff = Lz - 2aσP for σP1/2 > 1 (where 2 is just for the upper and lower polymer grafted surfaces, brush height h = aσP for σP1/2 > 1[68]). When the ABC triblock copolymer is confined between two hard surfaces (without polymer brush-coated substrates), the corresponding effective film thickness is 22a in this case.The morphology comparison of ABC triblock copolymer confined between polymer-coated substrates and hard surfaces is listed in Figure 6. The first column is the composition of ABC triblock copolymer. The second column is the morphologies of the ABC triblock copolymer confined between the polymer brush-coated surfaces and the morphologies of the polymer brush. The third column is the morphologies of ABC triblock copolymer confined between hard surfaces (without polymer brush-coated) and the 3D isosurface for a clear view. The microphase patterns, displayed in the form of density, are the red, green, and blue, assigned to A, B, and C, respectively. Similarly, the red, green, and blue colors in 3D isosurface graphs are assigned to blocks A, B, and C for a good correspondence, respectively. For the ABC triblock copolymer confined between polymer brush-coated substrates, the morphology of the grafted polymer on the lower substrate (polymer brush) is also shown below the morphology of ABC triblock copolymer. We only give the morphology of the grafted polymer on the lower substrate (polymer brush) due to the symmetry of the polymer brush (the two polymer brush-coated surfaces are identical). For the ABC triblock copolymer confined between the hard surfaces, the 3D isosurface is also shown below the morphology.


Complex microstructures of ABC triblock copolymer thin films directed by polymer brushes based on self-consistent field theory.

Jiang Z, Xu C, Qiu YD, Wang X, Zhou D, Xue G - Nanoscale Res Lett (2014)

Comparison of the morphology of ABC triblock copolymer confined between hard surfaces and polymer brush-coated substrates. The microphase patterns, displayed in the form of density, are the red, green, and blue, assigned to A, B, and C, respectively. The 3D isosurface graphs are also given for a clear view for the ABC triblock copolymer confined between the hard surfaces. The red, green, and blue colors in isosurface graphs are assigned to the blocks A, B, and C for a good correspondence, respectively. For the ABC triblock copolymer confined between polymer brush-coated substrates, the 3D isosurface of the grafted polymer on the lower substrate is also shown below the morphology due to the symmetry of the polymer brush. For the ABC triblock copolymer confined between hard surfaces, the 3D isosurface is also shown below the morphology.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4120731&req=5

Figure 6: Comparison of the morphology of ABC triblock copolymer confined between hard surfaces and polymer brush-coated substrates. The microphase patterns, displayed in the form of density, are the red, green, and blue, assigned to A, B, and C, respectively. The 3D isosurface graphs are also given for a clear view for the ABC triblock copolymer confined between the hard surfaces. The red, green, and blue colors in isosurface graphs are assigned to the blocks A, B, and C for a good correspondence, respectively. For the ABC triblock copolymer confined between polymer brush-coated substrates, the 3D isosurface of the grafted polymer on the lower substrate is also shown below the morphology due to the symmetry of the polymer brush. For the ABC triblock copolymer confined between hard surfaces, the 3D isosurface is also shown below the morphology.
Mentions: In this part, we give two cases for comparison between the ABC triblock copolymer thin film with and without polymer brush-coated substrates (σ = 0.15) at χABN = χBCN = χACN = 35. In order to simulate the similar interface environment with the ABC triblock copolymer thin film between polymer brush-coated substrates, we set the interaction parameters ηASN = ηCSN = 35 and ηBSN = 0 for the ABC triblock copolymer thin film between hard surfaces, which means the substrate is good for the middle block B. In principle, the effective film thickness for the ABC triblock copolymer thin film confined between the polymer brush-coated substrates is like Lzeff = Lz - 2aσP for σP1/2 > 1 (where 2 is just for the upper and lower polymer grafted surfaces, brush height h = aσP for σP1/2 > 1[68]). When the ABC triblock copolymer is confined between two hard surfaces (without polymer brush-coated substrates), the corresponding effective film thickness is 22a in this case.The morphology comparison of ABC triblock copolymer confined between polymer-coated substrates and hard surfaces is listed in Figure 6. The first column is the composition of ABC triblock copolymer. The second column is the morphologies of the ABC triblock copolymer confined between the polymer brush-coated surfaces and the morphologies of the polymer brush. The third column is the morphologies of ABC triblock copolymer confined between hard surfaces (without polymer brush-coated) and the 3D isosurface for a clear view. The microphase patterns, displayed in the form of density, are the red, green, and blue, assigned to A, B, and C, respectively. Similarly, the red, green, and blue colors in 3D isosurface graphs are assigned to blocks A, B, and C for a good correspondence, respectively. For the ABC triblock copolymer confined between polymer brush-coated substrates, the morphology of the grafted polymer on the lower substrate (polymer brush) is also shown below the morphology of ABC triblock copolymer. We only give the morphology of the grafted polymer on the lower substrate (polymer brush) due to the symmetry of the polymer brush (the two polymer brush-coated surfaces are identical). For the ABC triblock copolymer confined between the hard surfaces, the 3D isosurface is also shown below the morphology.

Bottom Line: By continuously changing the composition of the block copolymer, the phase diagrams are constructed for three cases with the fixed film thickness and the brush density: identical interaction parameters, frustrated and non-frustrated cases.Some ordered complex morphologies are observed: parallel lamellar phase with hexagonally packed pores at surfaces (LAM3 (ll) -HFs), perpendicular lamellar phase with cylinders at the interface (LAM(⊥)-CI), and perpendicular hexagonally packed cylinders phase with rings at the interface (C2 (⊥)-RI).A desired direction (perpendicular or parallel to the coated surfaces) of lamellar phases or cylindrical phases can be obtained by varying the composition and the interactions between different blocks.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Polymer Science and Engineering, Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education, State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.

ABSTRACT
The morphology and the phase diagram of ABC triblock copolymer thin film directed by polymer brushes are investigated by the self-consistent field theory in three dimensions. The polymer brushes coated on the substrate can be used as a good soft template to tailor the morphology of the block copolymer thin films compared with those on the hard substrates. The polymer brush is identical with the middle block B. By continuously changing the composition of the block copolymer, the phase diagrams are constructed for three cases with the fixed film thickness and the brush density: identical interaction parameters, frustrated and non-frustrated cases. Some ordered complex morphologies are observed: parallel lamellar phase with hexagonally packed pores at surfaces (LAM3 (ll) -HFs), perpendicular lamellar phase with cylinders at the interface (LAM(⊥)-CI), and perpendicular hexagonally packed cylinders phase with rings at the interface (C2 (⊥)-RI). A desired direction (perpendicular or parallel to the coated surfaces) of lamellar phases or cylindrical phases can be obtained by varying the composition and the interactions between different blocks. The phase diagram of ABC triblock copolymer thin film wetted between the polymer brush-coated surfaces is very useful in designing the directed pattern of ABC triblock copolymer thin film.

No MeSH data available.


Related in: MedlinePlus