期刊
MACROMOLECULES
卷 43, 期 6, 页码 2880-2889出版社
AMER CHEMICAL SOC
DOI: 10.1021/ma902843q
关键词
-
资金
- Nano-electronics Research Initiative [RID 1549]
- Focus Center Research Program (FCRP) - Center on Functional Engineered Nano Architectonics (FENA)
- National Science Foundation [DMR-0520415]
A modular and hierarchical self-assembly strategy using block copolymer blends (AB/B'C) with tunable supramolecular interactions is reported. By combining supramolecular assembly of hydrogenbonding units with controlled phase separation of diblock copolymers, highly ordered square arrays or hexagonal at-rays of cylindrical domains were obtained for mixtures of poly(etllylene oxide)-b-polystyrene-r-4-hydroxystyrene) (PEO-b-P(S-r-4HS)) and poly(styrene-r-4-vinylpyridine)-b-poly(methyl methacrylate) (P(S-r-4VP)-b-PMMA) diblock copolymers under solvent annealing with controlled high humidity. The fraction of the H-bonded phenolic and pyridyl units was shown to be critical for both the generation of long-range order and controlling the spatial arrangement of the cylindrical domains. Both low absolute numbers and a near-stoichiometric ratio of pyridyl-to-phenolic groups are needed to produce ordered square arrays with separated PEO and PMMA domains, whereas a low ratio of pyridyl-to-phenolic groups facilitated the formation of ordered hexagonal arrays with mixed PEO and PMMA domains. Self-consistent field theory simulations suggest that the effective Flory-Huggins parameters between the various blocks control the stability of the different packing structures in this system. The modularity and tenability of this supramolecular block copolymer blending approach is a unique and powerful strategy to fabricate diverse nanostructures for a variety of applications such as block copolymer lithography.
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