Cited by 129Block Copolymer Self-AssemblyMesoporous Materials and CatalysisAdvanced Polymer Synthesis and Characterization

Syntheses of Silica/Polystyrene-block-Poly(ethylene oxide) Films with Regular and Reverse Mesostructures of Large Characteristic Length Scales by Solvent Evaporation-Induced Self-Assembly

Yu, Kui, Hurd, Alan J., Eisenberg, Adi, Brinker, C. Jeffrey·2001·Langmuir

Abstract

Silica/diblock films with various mesostructures of large characteristic length scales were synthesized through evaporation-induced self-assembly (EISA). The structure-directing agents used were amphiphilic polystyrene- block -poly(ethylene oxide) (PS- b -PEO) diblock copolymers of high molecular weights. The synthesis process began with a dilute homogeneous solution of a silica precursor and the diblock copolymer in a mixture of tetrahydrofuran (THF) and water. After this dilute solution was cast, THF preferentially evaporated; accordingly, the species in the depositing film increasingly concentrated and the solvent quality for the diblock progressively decreased. At some critical point, cooperative self-assembly of both the PS- b -PEO diblock and the silicate started. Subsequently, liquid-crystalline mesophases were obtained. The present study indicates that silica/diblock films with different mesostructures can be synthesized by using one identical diblock; as the volume ratio of the diblock to silica increases, mesostructures change progressively from regular to inverted (reverse) via lamellar. For the silica/diblock films with regular mesophases, copolymer removal produces mesopores; highly ordered mesoporous silica films with different pore sizes result from using diblocks with different molecular weights. Particularly noteworthy is the ready formation of the silica/diblock multi-bilayer vesicular mesostructures. The present system is believed to be the first to use high glass transition temperature ( T g ≈ 373 K), PS-based amphiphilic diblock copolymers to prepare silica/diblock films with regular and reverse mesophases, as well as multi-bilayer vesicular mesostructures, through solvent evaporation-induced self-assembly.

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Crossref · 10.1021/la0113724

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  • Using a pore expanding agent in the composite risks unstable mesostructures.

    “However, care must be taken when using the pore expanding agent to the composite in order to avoid the risk of unstable mesostructures [160].”

    From Block Copolymers: Synthesis, Self-Assembly, and Applications (2017) · cites this paper as [160]

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Authors
Yu, K., Hurd, A. J., Eisenberg, A., & Brinker, C. J.
Affiliations
Los Alamos National Laboratory (US)
Venue
Langmuir
Published
2001-12-01
Volume
17
Issue
26
Pages
7961-7965
ISSN
  • 0743-7463 (ISSN-L)
  • 1520-5827
OpenAlex
W2063902646
Cited by
129
References
29
Citations by year
2023: 1 · 2022: 3 · 2021: 2 · 2020: 3 · 2019: 2 · 2018: 2 · 2017: 11 · 2016: 6 · 2015: 5 · 2014: 5 · 2013: 14 · 2012: 5
FWCI
6.47
Type
journal article
Language
en
Open access
closed
Locations
Langmuir (publishedVersion)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Block Copolymer Self-Assembly
  • Physical Sciences › Materials Science › Materials Chemistry › Mesoporous Materials and Catalysis
  • Physical Sciences › Chemistry › Organic Chemistry › Advanced Polymer Synthesis and Characterization
Keywords
evaporation-induced self-assembly, amphiphilic diblock copolymers, polystyrene-block-poly(ethylene oxide), mesoporous silica, liquid crystalline mesophases, lamellar mesophase, mesopore formation, high glass transition temperature, block copolymer self-assembly

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