Well-ordered Nanostructure Formation of Wholly Aromatic Poly(amic acid)s in Spin-casted Thin Films

Gao, Ling; Azuma, Koei; Okuhara, Kenta; Hayakawa, Teruaki

doi:10.2494/photopolymer.29.247

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…Based on such background, the fabrication of ordered mesoporous polyimide films by the softtemplate method has been reported [19][20][21][22][23][24][25][26]. In this method, an amphiphilic block copolymer with a narrow polydispersity and a well-defined composition ratio is used as a template to form ordered microphase-separated structures.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of Crosslinked Polyimides Templated by Block Copolymers for Fabrication of Porous Films

Komamura

Nabae

Hayakawa

2021

J. Photopol. Sci. Technol.

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Section: Introductionmentioning

confidence: 99%

Self-assembly of Crosslinked Polyimides Templated by Block Copolymers for Fabrication of Porous Films

Komamura

Nabae

Hayakawa

2021

J. Photopol. Sci. Technol.

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“…Given the background, the facile fabrication method of obtaining ordered mesoporous polyimide films by developing the soft-template method was reported [29][30][31][32][33][34][35][36]. In this method, an amphiphilic block copolymer with a narrow polydispersity and a well-defined composition ratio was used as a template to make ordered nanostructure.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Mesoporous Polyimide Composite Films by a Soft-Template Method Followed by Ozonolysis

Komamura

Azuma

Nabae

et al. 2020

J. Photopol. Sci. Technol.

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Mesoporous polyimide composite films were fabricated by a soft template method using a microphase-separated structure of an amphiphilic block copolymer and porosification by ozonolysis. Poly(1,4-isoprene)-block-poly(2-vinylpyridine) was used as the template block copolymer. Poly(amic acid) (PAA), the precursor of polyimide, and resol, the cross-linker for stabilization of the nanostructure, were miscible into the poly(2-vinylpyridine) domain which is the hydrophilic domain of the template block copolymer. The mixture co-assembled and formed a periodic body-centered cubic nanostructure. The study of ozonolysis condition revealed that the reaction in hexane allowed porosification without the collapse of the nanostructure. Polyimide composite films with well-defined mesopores were successfully obtained by the sequential processes of the PAA composite film, namely, thermal annealing for crosslinking of resol, ozonolysis in hexane for the decomposition of polyisoprene domain, and thermal treatment for imidization of PAA. The domain spacing determined by smallangle X-ray scattering was 28.8 nm, and the average pore size based on scanning electron microscopy was 24 nm.

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“…Subsequently, the composite was heat-treated to decompose the template BCP selectively and formed a well-ordered mesoporous structure. This attractive soft-template method has not been applied to polyimides to date, although examples of some low molecular weight imide compounds − and conventional phenolic resins − have been reported. If such a soft-template method could be combined with polyimides having relatively high molecular weights, more various attractive mesoporous films could be developed because of their excellent thermal and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Well-Ordered Mesoporous Polyimide Films by a Soft-Template Method

Komamura

Okuhara

Horiuchi

et al. 2019

ACS Appl. Polym. Mater.

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A well-ordered mesoporous polyimide film was fabricated by a soft-template method using a microphase-separated structure of an amphiphilic block copolymer (BCP) as a template. Poly(amic acid)s (PAAs) as polyimide precursors and resol as a cross-linker for the stabilization of the nanostructure were found to be selectively miscible with the hydrophilic domain of the template BCP. Their mixture coassembled and formed the desired ordered nanostructures. The composite films tended to form well-ordered nanostructures when PAAs with a flexible domain such as ether or methylene were used. Mesoporous polyimide films were obtained on thermal treatment of the composite films formed via the sequential processes of cross-linking of the resol, imidization of the PAAs, and selective decomposition of the template BCPs. A polyimide film with well-ordered hexagonal-packed cylindrical mesopores was successfully fabricated after the thermal treatment of the composite film based on PAA/polystyrene-block-poly(methacrylic acid)/resol. The domain spacing based on small-angle X-ray scattering was 29.4 nm, and the pore diameter was determined by scanning electron microscopy to be ∼19 nm.

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Well-ordered Nanostructure Formation of Wholly Aromatic Poly(amic acid)s in Spin-casted Thin Films

Cited by 5 publications

References 6 publications

Self-assembly of Crosslinked Polyimides Templated by Block Copolymers for Fabrication of Porous Films

Self-assembly of Crosslinked Polyimides Templated by Block Copolymers for Fabrication of Porous Films

Fabrication of Mesoporous Polyimide Composite Films by a Soft-Template Method Followed by Ozonolysis

Fabrication of Well-Ordered Mesoporous Polyimide Films by a Soft-Template Method

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