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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

Phase diagram of ABC triblock copolymer with χABN = χBCN = χACN = 35 at grafting densityσ = 0.15. Dis represents the disordered phase.
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Figure 3: Phase diagram of ABC triblock copolymer with χABN = χBCN = χACN = 35 at grafting densityσ = 0.15. Dis represents the disordered phase.

Mentions: We also consider the grafting density σ = 0.15 when χABN = χBCN = χACN = 35. The grafting density decreases a little, which shows that the effective film thickness increases. The phase diagram is shown in Figure 3. From the figure, we can see that the lamellar phase region contracts and some new phases emerge, such as two-color perpendicular lamellar phase (LAM2⊥) and core-shell hexagonally packed spherical phase (CSHS). Due to the decrease of the grafting density, the influence of the brush will weaken. Similar with the case of σ = 0.20, the core-shell structures occur near the corners A and C. CSHS phase forms at fA = 0.10, fB = 0.10, fC = 0.80; fA = 0.80, fB = 0.10, fC = 0.10. The core-shell cylindrical phase occurs near the phase CSHS. In these cases, the block A (or C) forms the majority, the block C (or A) forms the ‘core,’ and the middle block B is around the block C (or A) forming the ‘shell’ of the core.


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)

Phase diagram of ABC triblock copolymer with χABN = χBCN = χACN = 35 at grafting densityσ = 0.15. Dis represents the disordered phase.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: Phase diagram of ABC triblock copolymer with χABN = χBCN = χACN = 35 at grafting densityσ = 0.15. Dis represents the disordered phase.
Mentions: We also consider the grafting density σ = 0.15 when χABN = χBCN = χACN = 35. The grafting density decreases a little, which shows that the effective film thickness increases. The phase diagram is shown in Figure 3. From the figure, we can see that the lamellar phase region contracts and some new phases emerge, such as two-color perpendicular lamellar phase (LAM2⊥) and core-shell hexagonally packed spherical phase (CSHS). Due to the decrease of the grafting density, the influence of the brush will weaken. Similar with the case of σ = 0.20, the core-shell structures occur near the corners A and C. CSHS phase forms at fA = 0.10, fB = 0.10, fC = 0.80; fA = 0.80, fB = 0.10, fC = 0.10. The core-shell cylindrical phase occurs near the phase CSHS. In these cases, the block A (or C) forms the majority, the block C (or A) forms the ‘core,’ and the middle block B is around the block C (or A) forming the ‘shell’ of the core.

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