【摘 要】
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Layer-by-layer polyelectrolyte self-assembly,a common method for preparing high-quality ultra-thin films,was employed to direct the self-assembly behavior of po
【机 构】
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College of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China“,”Shanghai
论文部分内容阅读
Layer-by-layer polyelectrolyte self-assembly,a common method for preparing high-quality ultra-thin films,was employed to direct the self-assembly behavior of polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) block copolymer for the first time.Differing from the previous neutral polymer brushes anchored to silicon substrates via chemical modification,polyelectrolyte multilayers (PEMs) were anchored by electrostatic interaction and provided a stable,smooth,and neutral interface.In the present study,PS-b-PMMA was deposited on poly(acrylamide hydrochloride)/poly(acrylic acid) (PAH/PAA) PEMs prepared by layer-by-layer self-assembly to successfully yield vertical nanodomains after thermal annealing.Seven layered PEMs revealed an excellent,smooth surface,with a low roughness of 0.6 nm.The periodic structure with interlamellar spacing of 47 nm was determined by grazing-incidence small-angle X-ray scattering (GISAXS).The morphology of the PS-b-PMMA nanodomains depended on the polyanion-to-polycation concentration ratio,which is related to the interaction between the block copolymer and the substrate.Our results demonstrate that layer-by-layer self-assembly is a helpful method for the phase separation of block polymers and the fabrication of vertical,ordered nanodomains.
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