New continuous process developed for synthesizing sponge-type polyimide membrane and its pore size control method via non-solvent induced phase separation (NIPS)

Kim, Myeong-Soo; Kim, Gunhwi; Kim, Jin‐Young; Lee, Daero; Lee, Sangrae; Kwon, Jinuk; Han, Haksoo

doi:10.1016/j.micromeso.2017.01.013

Cited by 28 publications

(20 citation statements)

References 34 publications

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“…The construction of a porous structure in the PI film also are reported to decrease the dielectric constant through the incorporation of air into the film . Yabu et al fabricated honeycomb films with polyamic acid/polyion complex and then prepared a low‐ k polyimide film through the imidization of polyamic acids Kim et al synthesized porous films by placing polyimide precursors in a coagulation bath filled with a non‐solvent by allowing the exchange of solvent with the nonsolvent to form the porous films …”

Section: Characteristics Of the 6fda‐oda Pi Filmmentioning

confidence: 99%

Superhydrophobic and Low‐k Polyimide Film with Porous Interior Structure and Hierarchical Surface Morphology

Dong

et al. 2019

Macro Materials & Eng

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Porous interior structured polyimide (PI) films with a hierarchical surface are fabricated from 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride and 4,4′‐oxydianiline by a water vapor induced phase separation process under a humid environment. Superhydrophobic properties with a water contact angle of 161° are obtained using the hierarchical surface morphology, which can be adjusted from flower‐like to wrinkle‐shape particles facilely by changing the relative humidity. The dielectric constant (k) of the PI film decreases sharply from 2.8 (film prepared under dry conditions) to ≈1.9 (film prepared under humid conditions) because of the interior porous structure and fluorine‐containing framework. Both a low‐k and superhydrophobicity are very important parameters for PI films in microelectronic and insulating applications.

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Section: Characteristics Of the 6fda‐oda Pi Filmmentioning

confidence: 99%

Superhydrophobic and Low‐k Polyimide Film with Porous Interior Structure and Hierarchical Surface Morphology

Dong

et al. 2019

Macro Materials & Eng

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“…It has been reported that PI asymmetric membranes have been successfully produced using polyamic acid (PAA) casting solution. 8 –10 In a recent research, PAA HFs were prepared by thermal iridization or chemical iridization to form PI HFs, thereby obtaining controllable aggregation morphology and processing properties. 11…”

Section: Introductionmentioning

confidence: 99%

Effect of introduction of fluoromonomer copolymerization on properties of polyimide hollow fibers

Zhang

Han

et al. 2020

High Performance Polymers

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The novel copolymerization polyimide (PI) hollow fibers (HFs) of 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) containing –CF3 groups were prepared and investigated through both simulation and experiment. To demonstrate the alteration attributable to the introduction of fluoromonomers, the condensed states of pyromellitic dianhydride (PMDA)/4,4′-oxybisbenzenamine (ODA), PMDA/6FDA/ODA, and 6FDA/ODA PI were constructed by Material Studio, and we simulated the mobility of molecular chain, free volume fraction, and O2/N2 dissolution–diffusion process. The molecular dynamics simulation results demonstrated that the properties of the copolymerized PI system with 6FDA were significantly improved, while the selectivity remained almost unchanged. Then, the films of copolymerized PI and HFs were prepared by the two-step method, and O2/N2 permeability of the PI copolymer films was characterized, indicating that although the gas permeation performance was greatly improved, the selectivity was not so satisfactory. However, the selection factor increased heavily after polydimethylsiloxane coating.

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“…Various methods of porosification of polyimide have been studied, such as phase separation method, gas introduction method, electrospinning method, and inverse opal method. However, as far as we have found, there is no report on a method for producing a porous polyimide film having homogeneous micropores that can be used as a filter medium of a tip resist [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Novel Fabrication of Three-Dimensional Homogeneous Microporous Polyimide Membrane

Sugawara

Koshiyama

Kawai

2018

J. Photopol. Sci. Technol.

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A polyimide porous membrane was fabricated using a relatively simple novel process. The process involves making a coating from a polyamic acid solution in which silica fine particles were dispersed, baking it for imidization, etching it with HF for silica removal, and controlling pore size with alkaline solution. In order to construct a porous structure, removal of silica fine particles by HF and control of pore diameter by an alkali solution were effective. Surface and cross section observation of the porous membrane by SEM and pore size measurement by a perm-porometer revealed that the membrane had a three-dimensional homogeneous microporous structure. Thermal analysis and organic solvent immersion testing confirmed the high heat resistance and chemical resistance of the porous membrane. The unique features revealed in this testing suggest that this porous membrane has various potential applications.

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New continuous process developed for synthesizing sponge-type polyimide membrane and its pore size control method via non-solvent induced phase separation (NIPS)

Cited by 28 publications

References 34 publications

Superhydrophobic and Low‐k Polyimide Film with Porous Interior Structure and Hierarchical Surface Morphology

Superhydrophobic and Low‐k Polyimide Film with Porous Interior Structure and Hierarchical Surface Morphology

Effect of introduction of fluoromonomer copolymerization on properties of polyimide hollow fibers

Novel Fabrication of Three-Dimensional Homogeneous Microporous Polyimide Membrane

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