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01.08.2021 | ORIGINAL PAPER

Preparation and properties of light-colored and transparent semi-alicyclic polyimide films with enhanced flame retardancy from alicyclic dianhydrides and aromatic diamine containing phenolphthalein unit

verfasst von: Lin Wu, Han-li Wang, Yuan-cheng An, Yan-jiang Jia, Yao-yao Tan, Xin-ying Wei, Xin-xin Zhi, Yan Zhang, Jin-gang Liu

Erschienen in: Journal of Polymer Research | Ausgabe 8/2021

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Abstract

Two semi-alicyclic polyimide (PI) films with light colors, good thermal stability, and enhanced flame retardancy were successfully developed from an aromatic diamine containing phenolphthalein unit, 3,3-bis[4-(4-aminophenoxy)phenyl]phthalide (BAPPT) and alicyclic dianhydrides, including 1,2,4,5-cyclohexanetetracarboxylic acid dianhydride (HPMDA) and 3,3',4,4'-bicyclohexanetetracarboxylic acid dianhydride (HBPDA). For this target, two organo-soluble PI resins, including PI-1 (HPMDA-BAPPT) and PI-2 (HBPDA-BAPPT) were first synthesized by a high-temperature polymerization route. The derived preimidized PI resins were soluble in N-methyl-2-pyrrolidinone (NMP), N,N-dimethylacetamide (DMAc), and other polar aprotic solvents. Corresponding PI films with pale-yellow appearances at the thickness of 25 μm were prepared by casting the PI solutions on glass substrates, followed by thermally baking at elevated temperatures up to 280 °C in nitrogen. The obtained PI films exhibited the cutoff wavelengths (λ_cut) lower than 300 nm, the optical transmittances as high as 84.5% at the wavelength of 450 nm, the yellow indices (b^*) as low as 3.10, and the haze values as low as 3.71%. Both of the PI films exhibited good thermal stability with the 5% weight loss temperatures (T_5%) higher than 480 °C in nitrogen, char yields higher than 40% at 700 °C, and glass transition temperatures (T_g) as high as 318.1 °C. In addition, the semi-alicyclic PI films showed acceptable high-temperature dimensional stability with the linear coefficients of thermal expansion (CTE) values of 52.3 × 10^–6/K for PI-1 and 60.4 × 10^–6/K for PI-2 in the temperature range of 50–200 °C, respectively. At last, the PI-1 film showed good flame retardancy with the limited oxygen index (LOI) of 32.8%, the flame retardancy class of UL94 VTM-0, and good smoke suppression properties.

Vorheriger Artikel Study of structural, optical and dielectric properties of ZnO/PVDF-based flexible sheets

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Titel: Preparation and properties of light-colored and transparent semi-alicyclic polyimide films with enhanced flame retardancy from alicyclic dianhydrides and aromatic diamine containing phenolphthalein unit
verfasst von: Lin Wu
Han-li Wang
Yuan-cheng An
Yan-jiang Jia
Yao-yao Tan
Xin-ying Wei
Xin-xin Zhi
Yan Zhang
Jin-gang Liu
Publikationsdatum: 01.08.2021
Verlag: Springer Netherlands
Erschienen in: Journal of Polymer Research / Ausgabe 8/2021
Print ISSN: 1022-9760
Elektronische ISSN: 1572-8935
DOI: https://doi.org/10.1007/s10965-021-02676-x

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