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Installation of the adamantyl group in polystyrene-block-poly(methyl mathacrylate) via Friedel-Crafts alkylation to modulate the microphase-separated morphology and dimensions

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Title: Installation of the adamantyl group in polystyrene-block-poly(methyl mathacrylate) via Friedel-Crafts alkylation to modulate the microphase-separated morphology and dimensions
Authors: Isono, Takuya Browse this author
Baba, Ema Browse this author
Tanaka, Shunma Browse this author
Miyagi, Ken Browse this author
Dazai, Takahiro Browse this author
Li, Feng Browse this author
Yamamoto, Takuya Browse this author →KAKEN DB
Tajima, Kenji Browse this author →KAKEN DB
Satoh, Toshifumi Browse this author →KAKEN DB
Issue Date: 14-Jun-2023
Publisher: Royal Society of Chemistry
Journal Title: Polymer chemistry
Volume: 14
Issue: 22
Start Page: 2675
End Page: 2684
Publisher DOI: 10.1039/d3py00113j
Abstract: Although polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) is the most widely employed template and scaffold for constructing nanoscale patterns, its relatively small Flory-Huggins interaction parameter makes it challenging to realize microphase-separated structures with a periodicity (or domain spacing) of less than 20 nm. The direct post-polymerization modification of PS-b-PMMA can resolve this issue. In this study, we present the PS block post-polymerization modification of commercially available PS-b-PMMA through a metal-free Friedel-Crafts alkylation reaction with adamantanols to modulate its microphase-separated morphology and dimensions. The adamantyl group can be easily installed on the PS benzene ring, which increases the incompatibility with the PMMA block, enabling ordered microphase-separated structures, including lamellar, gyroid and hexagonally close-packed cylindrical structures, from low-molecular-weight PS-b-PMMA. Notably, a periodicity as low as approximately 16 nm was realized with this strategy, which is much lower than the lowest accessible periodicity of pristine PS-b-PMMA. Furthermore, we observed additional benefits from the installation of the adamantyl group, such as increased thermal stability, glass transition temperature and etching contrast.
Type: article
URI: http://hdl.handle.net/2115/89298
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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