Directed Self-assembly of Vertical PS-b-PMMA Nanodomains Grown on Multilayered Polyelectrolyte Films

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 br...

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Bibliographic Details
Published in:Chinese journal of polymer science 2020, Vol.38 (1), p.92-99
Main Authors: Liu, Kai, Yang, Chun-Ming, Yang, Bo-Ming, Zhang, Lan, Huang, Wen-Chao, Ouyang, Xiao-Ping, Qi, Fu-Gang, Zhao, Nie, Bian, Feng-Gang
Format: Article
Language:English
Subjects:
Acrylamide
Acrylics
Block copolymers
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Industrial Chemistry/Chemical Engineering
Morphology
Multilayers
Organic chemistry
Periodic structures
Phase separation
Polyacrylic acid
Polyelectrolytes
Polymer Sciences
Polymethyl methacrylate
Polystyrene resins
Self-assembly
Silicon substrates
Small angle X ray scattering
Thin films
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Summary: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.
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-019-2315-z