Study on Microdomain Structure of Block Copolymer Confined at Hemispherical Cavities Modified by Functional Groups
- Study on Microdomain Structure of Block Copolymer Confined at Hemispherical Cavities Modified by Functional Groups
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- We studied on lamellar microdomains of polystyrene-block-poly(methyl methacrylate) copolymer (PS-b-PMMA) confined at hemispherical cavities prepared by anodic aluminum oxide (AAO) template. The cavities have two controlled interfaces. One is the cavity wall grafted with three different brushes (two selective brushes made of PMMA-OH and PS-OH, and one neutral brush made of PS-ran-PMMA). The other is the top surface of the cavity covered with films of PMMA and PS homopolymers, and PS-ran-PMMA. When the cover film was selective to one of block, the parallel lamellae were formed at the top of the cavity. But, the microdomain arrangement at the middle and bottom parts of the cavity highly depended on the type of the brushes on the cavity wall, for instance, concentric lamellae for selective brush and unspecific complex structure for the neutral brush. Once parallel lamellae and concentric lamella are met together, isolated spheres consisting of one block are formed. When the cavity wall are modified by the neutral brush and the cover layer is selective one of the block, stacked lamellae are observed. On the other hand, when the cover film is neutral to the both block chains, concentric lamellae or bi-continuous lamellae structure were formed depending of the nature of the brushes on the cavity wall. The experimental results were compared with the simulations based on self-consistent field theory.
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