Mechanically Robust and Transparent Polyamideimide Films via Consecutive Polycondensation, Amidation, Acid Removal, and Bluing Agent Addition

Kim, Young‐Rae; Lee, Jineun; Kim, Heesang; Jeon, Yooseop; Kim, Young-Su; Seong, Hoon-Moh; Kwak, Giseop

doi:10.1021/acsapm.2c01676

Cited by 9 publications

(6 citation statements)

References 16 publications

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“…Meanwhile, the APPFP-based film had a lower elastic modulus and tensile strength of 4.1 GPa and 81 MPa, respectively, and the highest value of elongation at break (38%), indicating a less rigid chain. These values are comparable to those of the colorless and transparent polyimide and polyamideimide films reported so far [ 19 , 20 , 21 ]. For example, fluorinated polyimide obtained from TFMB and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) has an elastic modulus of 3.1 GPa and a tensile strength of 120 MPa.…”

Section: Resultssupporting

confidence: 89%

Preparation and Properties of Mechanically Robust, Colorless, and Transparent Aramid Films

Kim,

Noh,

Kim

et al. 2024

Polymers

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In this study, various diamine monomers were used to synthesize aramid polymer films via a low-temperature solution condensation reaction with diacid chloride. For diamines with relatively high basicity, the reaction system became opaque because amine salt formation inhibited polymer synthesis. Meanwhile, low-basicity diamines with strong electron-withdrawing groups, such as CF3 and sulfone, were smoothly polymerized without amine salt formation to provide highly viscous solutions. The acid byproduct HCl generated during polymerization was removed by adding propylene oxide to the reaction vessel and converting the acid into highly volatile inert substances. The resulting solutions were used as varnishes without any additional purification, and polymer films with an excellent appearance were easily obtained through a conventional casting and convection drying process. The films neither tore nor broke when pulled or bent by hand; furthermore, even when heated up to 400 °C, they did not decompose or melt. Moreover, polymers prepared from 2,2-bis(trifluoromethyl)benzidine (TFMB) and bis(4-aminophenyl)sulfone (pAPS) did not exhibit glass transition until decomposition. The prepared polymer films showed a high elastic modulus of more than 4.1 GPa and a high tensile strength of more than 52 MPa. In particular, TFMB-, pAPS-, and 2,2-bis(4-aminophenyl)hexafluoropropane-based polymer films were colorless and transparent, with very high light transmittances of 95%, 96%, and 91%, respectively, at 420 nm and low yellow indexes of 2.4, 1.9, and 4.3, respectively.

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Section: Resultssupporting

confidence: 89%

Preparation and Properties of Mechanically Robust, Colorless, and Transparent Aramid Films

Kim,

Noh,

Kim

et al. 2024

Polymers

Self Cite

View full text Add to dashboard Cite

show abstract

“…Meanwhile, the APPFP-based film had a lower elastic modulus and tensile strength of 4.1 GPa and 81 MPa, respectively, and the highest value of elongation at break (38%), indicating a less rigid chain. These values are comparable to those of the colorless and transparent polyimide and polyamideimide films reported so far [14][15][16]. For example, fluorinated polyimide obtained from TFMB and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) has an elastic modulus of 3.1 GPa and a tensile strength of 120 MPa.…”

Section: Mechanical Properties Of Aramidssupporting

confidence: 85%

Preparation and Properties of Mechanically Robust, Colorless, and Transparent Aramid Films

Kim,

Noh,

Kim

et al. 2024

Preprint

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In this study, various diamine monomers were used to synthesize aramid polymer films via a low-temperature solution condensation reaction with diacid chloride. For diamines with relatively high basicity, the reaction system became opaque because amine salt formation inhibited polymer synthesis. Meanwhile, low-basicity diamines with strong electron-withdrawing groups, such as CF3 and sulfone, were smoothly polymerized without amine salt formation to provide highly viscous solutions. The acid byproduct HCl generated during polymerization was removed by adding propylene oxide to the reaction vessel and converting the acid into highly volatile inert substances. The resulting solutions were used as varnishes without any additional purification, and polymer films with an excellent appearance were easily obtained through a conventional casting and convection drying process. The films neither tore nor broke when pulled or bent by hand; furthermore, even when heated up to 400°C, they did not decompose or melt. Moreover, polymers prepared from 2,2-bis (trifluoromethyl) benzidine (TFMB) and bis (4-aminophenyl) sulfone (pAPS) did not exhibit glass transition until decomposition. The prepared polymer films showed a high elastic modulus of more than 4.1 GPa and a high tensile strength of more than 52 MPa. In particular, TFMB-, pAPS-, and 2,2-bis (4-aminophenyl) hexafluoropropane-based polymer films were colorless and transparent, with very high light transmittances of 95%, 96%, and 91%, respectively, at 420 nm and low yellow indexes of 2.4, 1.9, and 4.3, respectively.

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“…[14][15][16] For example, the fluorinated polyimide obtained using TFMB and 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) has an elastic modulus of 3.1 GPa. [17,18] 2.1.6. Optical Properties…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Acrylamide‐Based Aramid‐Reinforced Soft Contact Lenses

Lee,

Yeo,

Noh

et al. 2024

Adv Eng Mater

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In this study, we attempted to manufacture acrylamide‐based soft contact lenses with high elastic modulus, tensile strength, water content, and oxygen transmissibility. For this purpose, colorless and transparent aramids were prepared using diamine monomers with strong electron‐withdrawing groups such as CF3 and sulfone groups. These aramids were used as reinforcing agents. These compounds were not only thermally and thermodynamically stable but also colorless, transparent, and mechanically very robust. They were very soluble in N,N‐dimethylacrylamide. Subsequently, reactive liquid resins were prepared simply by dissolving aramids in N,N‐dimethylacrylamide, and lenses were manufactured by the bulk polymerization of the liquid resins to which an appropriate amount of a crosslinking agent was added. Mechanically enhanced soft contact lenses were thus easily produced by the conventional manufacturing method. Some of the synthesized lenses maintained their original shape without phase separation even after hydration. These lenses had remarkably higher elastic modulus (up to 8.13 MPa) and tensile strength (up to 1.62 MPa) than the conventional lenses made of 2‐hydroxyethyl methacrylate. The synthesized lenses also had a high water content (up to 83.0%) and oxygen transmissibility (up to 26.8 Dk/t).This article is protected by copyright. All rights reserved.

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Mechanically Robust and Transparent Polyamideimide Films via Consecutive Polycondensation, Amidation, Acid Removal, and Bluing Agent Addition

Cited by 9 publications

References 16 publications

Preparation and Properties of Mechanically Robust, Colorless, and Transparent Aramid Films

Preparation and Properties of Mechanically Robust, Colorless, and Transparent Aramid Films

Preparation and Properties of Mechanically Robust, Colorless, and Transparent Aramid Films

Acrylamide‐Based Aramid‐Reinforced Soft Contact Lenses

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