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Color-Tunable Intrinsically Black Polyimides: A Facile Strategy via In Situ Oxidation Color Control.

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Title: Color-Tunable Intrinsically Black Polyimides: A Facile Strategy via In Situ Oxidation Color Control.
Authors: Kong, Desheng1,2 (AUTHOR), Ma, Jiaojiao1,2 (AUTHOR) zyli2@ciac.ac.cn, Li, Zeyu1,2 (AUTHOR), Shi, Shun1,2 (AUTHOR), Yuan, Tong1,2 (AUTHOR), Qian, Jianfeng1,2 (AUTHOR), Guo, Haiquan1 (AUTHOR) hqguo@ciac.ac.cn
Source: Polymers (20734360). Nov2025, Vol. 17 Issue 21, p2876. 12p.
Subjects: Optical engineering, Polyimides, Polymers, Light absorption, Thermal stability, Oxidation
Abstract: Black polyimide (BPI) has shown important value in the field of optical engineering due to its excellent light shielding, high temperature stability, and mechanical strength. However, carbon materials or organic dye-doped BPI suffer from poor insulation, low mechanical strength, and poor thermal stability. Intrinsic BPI has gradually become a hot topic of research at this stage. Polyimides containing dianiline structure have unique reducing activity, and the visible light absorption range can be expanded by adding an oxidant in situ to achieve BPI preparation. In this work, a polymerizable dianiline derivative- 2,4-diaminodiphenylamine (NPDA) has been developed. The resulting diamine monomers were then polymerized with a dianhydride monomer via a conventional two-step method to prepare soluble polyimide. The diphenylamine-containing group PI was characterized by 1H NMR, FTIR and UV absorption spectroscopy. It was found that by changing the oxidant ratio, a yellow, red and even black controllable polyimide film could be obtained. When fully oxidized, the BPI cutoff wavelength red shifts to 591 nm, light transmittance reaches as low as 5.9% (full visible light 300–700 nm mean), and BPI can maintain the electrical insulation and heat resistance of polyimide. This method of oxidizing soluble polyimide in situ has advantages such as economy, universality, process consistency, ease of access and superior performance. [ABSTRACT FROM AUTHOR]
Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Color-Tunable Intrinsically Black Polyimides: A Facile Strategy via In Situ Oxidation Color Control.
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  Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Nov2025, Vol. 17 Issue 21, p2876. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Optical+engineering%22">Optical engineering</searchLink><br /><searchLink fieldCode="DE" term="%22Polyimides%22">Polyimides</searchLink><br /><searchLink fieldCode="DE" term="%22Polymers%22">Polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Light+absorption%22">Light absorption</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stability%22">Thermal stability</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation%22">Oxidation</searchLink>
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  Label: Abstract
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  Data: Black polyimide (BPI) has shown important value in the field of optical engineering due to its excellent light shielding, high temperature stability, and mechanical strength. However, carbon materials or organic dye-doped BPI suffer from poor insulation, low mechanical strength, and poor thermal stability. Intrinsic BPI has gradually become a hot topic of research at this stage. Polyimides containing dianiline structure have unique reducing activity, and the visible light absorption range can be expanded by adding an oxidant in situ to achieve BPI preparation. In this work, a polymerizable dianiline derivative- 2,4-diaminodiphenylamine (NPDA) has been developed. The resulting diamine monomers were then polymerized with a dianhydride monomer via a conventional two-step method to prepare soluble polyimide. The diphenylamine-containing group PI was characterized by 1H NMR, FTIR and UV absorption spectroscopy. It was found that by changing the oxidant ratio, a yellow, red and even black controllable polyimide film could be obtained. When fully oxidized, the BPI cutoff wavelength red shifts to 591 nm, light transmittance reaches as low as 5.9% (full visible light 300–700 nm mean), and BPI can maintain the electrical insulation and heat resistance of polyimide. This method of oxidizing soluble polyimide in situ has advantages such as economy, universality, process consistency, ease of access and superior performance. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/polym17212876
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 2876
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      – SubjectFull: Optical engineering
        Type: general
      – SubjectFull: Polyimides
        Type: general
      – SubjectFull: Polymers
        Type: general
      – SubjectFull: Light absorption
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      – SubjectFull: Thermal stability
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      – SubjectFull: Oxidation
        Type: general
    Titles:
      – TitleFull: Color-Tunable Intrinsically Black Polyimides: A Facile Strategy via In Situ Oxidation Color Control.
        Type: main
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          Name:
            NameFull: Kong, Desheng
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            NameFull: Ma, Jiaojiao
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            NameFull: Li, Zeyu
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            NameFull: Shi, Shun
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            NameFull: Yuan, Tong
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            – D: 01
              M: 11
              Text: Nov2025
              Type: published
              Y: 2025
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