Thermal Plastic and Optical Transparent Polyimide Derived from Isophorone Diamine and Sulfhydryl Compounds

Wu, Zhefu; Yan, Guangming; Lu, Jiehong; Zhang, Gang; Yang, Jie

doi:10.1021/acs.iecr.9b00674

Cited by 14 publications

(5 citation statements)

References 39 publications

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“…Figure 3 compares the tensile modulus, total transmittance, and YI of CLPI-70 and CLPI-70/S-1.8 with those of previously reported optical films, including various conventional CLPIs prepared in this study. [15,[63][64][65][66][67][68][69][70][86][87][88][89][90][91][92][93] CLPI-70 has enhanced mechanical strength and optical properties compared to those of the reported optical films. Moreover, CLPI-70/S-1.8 has a tensile modulus of over 8.0 GPa, total transmittance close to 90%, and YI below 3.0.…”

Section: Mechanical and Optical Properties And Folding Reliabilitymentioning

confidence: 99%

Highly Transparent, Colorless Optical Film with Outstanding Mechanical Strength and Folding Reliability Using Mismatched Charge‐Transfer Complex Intensification

Ahn

Kim

Hong

et al. 2022

Adv Funct Materials

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The development of flexible displays and electronics is hindered by the disadvantages of polymeric window films, such as low mechanical strength, poor optical properties, and lack of folding and rolling reliability. To overcome these critical limitations, a novel colorless polyimide window film is prepared in this study using the concept of charge‐transfer complex (CTC) intensification. The resulting window film has a tensile modulus of 8.4 GPa, total transmittance of ≈90%, and yellow index below 3, which is the best recorded balance between mechanical strength and optical properties for a highly flexible optical film. Unlike commercially available optical‐grade engineering plastic films and glass substrates, the prepared window film has both pencil hardness grade over 2H and folding reliability over 200 000 folding/unfolding cycles. These remarkable properties are attributed to the unique supramolecular structure with multiple hydrogen bonding and salt complexation interactions, which exhibits CTC intensification. The CTC intensification mechanism is also proposed in this study.

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Section: Mechanical and Optical Properties And Folding Reliabilitymentioning

confidence: 99%

Highly Transparent, Colorless Optical Film with Outstanding Mechanical Strength and Folding Reliability Using Mismatched Charge‐Transfer Complex Intensification

Ahn

Kim

Hong

et al. 2022

Adv Funct Materials

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“…In addition to alkyl halides, an acid chloride was applicable in this sequence to form a corresponding monomer product, 20 in 81% yield. Further treatment with hydrogen chloride after depolymerization afforded 4,4’-dimercaptobenzophenone ( 21 ) 57 . This one-pot depolymerization/functionalization method was applicable in the three-step sequence.…”

Section: Resultsmentioning

confidence: 99%

Depolymerization of robust polyetheretherketone to regenerate monomer units using sulfur reagents

et al. 2023

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Super engineering plastics, high-performance thermoplastic resins such as polyetheretherketone, and polyphenylene sulfide have been utilized in industries, owing to their high thermal stability and mechanical strength. However, their robustness hinders their depolymerization to produce monomers and low-weight molecules. Presently, chemical recycling for most super engineering plastics remains relatively unexplored. Herein, we report the depolymerization of insoluble polyetheretherketone using sulfur nucleophiles via carbon–oxygen bond cleavages to form benzophenone dithiolate and hydroquinone. Treatment with organic halides converted only the former products to afford various dithiofunctionalized benzophenones. The depolymerization proceeded as a solid–liquid reaction in the initial phase. Therefore, this method was not affected by the shape of polyetheretherketone, e.g., pellets or films. Moreover, this depolymerization method was applicable to carbon- or glass fiber-enforced polyetheretherketone material. The depolymerized product, dithiofunctionalized benzophenones, could be converted into diiodobenzophenone, which was applicable to the polymerization.

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“…Polyimide foams (PIFs) have promising applications in the areas of microelectronics, aerospace, aeronautics, marine use, and transportation due to their excellent thermal insulation, vibration damping, thermal stability, and flame retardancy among others. − The successful introduction of commercial products such as Solimide, TEEK, and Rexfoam has largely expanded the market for PIFs as insulation materials. − As such, great efforts have been devoted to developing high-performance PIFs to suit increasing demands from the above-mentioned industrial sectors.…”

Section: Introductionmentioning

confidence: 99%

Structure to Properties Relations of Polyimide Foams Derived from Various Dianhydride Components

Luo

Yan

et al. 2021

Ind. Eng. Chem. Res.

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This work focuses on the influence of chain structure on properties such as the structural, thermal, morphological, and mechanical properties of polyimide foams (PIFs) which were prepared by polyester ammonium salt powder foaming process. Results showed that the melt viscosity of PEAS is affected by the structure of dianhydrides, which can greatly determine the foaming process, cell structure, and final properties of PIFs. PIF which was derived from 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and 4,4′-diaminodiphenylmethane exhibited the highest compressive strength (0.374 MPa-RT, 0.194 MPa-200 °C) and compressive modulus (9.24 MPa-RT, 7.37 MPa-200 °C). All PIFs exhibited excellent thermal stability as the initial thermal decomposition temperature reached as high as 544 °C. In addition, the thermal conductivity of the as-prepared PIFs fell in a range of 38−42 mW m −1 K −1 , which show potential applications in areas of aerospace, aeronautics, marine use, and transportation among others.

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Thermal Plastic and Optical Transparent Polyimide Derived from Isophorone Diamine and Sulfhydryl Compounds

Cited by 14 publications

References 39 publications

Highly Transparent, Colorless Optical Film with Outstanding Mechanical Strength and Folding Reliability Using Mismatched Charge‐Transfer Complex Intensification

Highly Transparent, Colorless Optical Film with Outstanding Mechanical Strength and Folding Reliability Using Mismatched Charge‐Transfer Complex Intensification

Depolymerization of robust polyetheretherketone to regenerate monomer units using sulfur reagents

Structure to Properties Relations of Polyimide Foams Derived from Various Dianhydride Components

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