Unveiling the Mystery: How TR precursors lead to exceptional gas separation performance in CMSMs

Journal of Membrane Science, Journal Year: 2024, Volume and Issue: 713, P. 123287 - 123287

Published: Sept. 3, 2024

Language: Английский

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High comprehensive properties of colorless transparent polyimide films derived from fluorine-containing and ether-containing dianhydride

RSC Advances, Journal Year: 2024, Volume and Issue: 14(44), P. 32613 - 32623

Published: Jan. 1, 2024

Fluorinated colorless transparent polyimide (CPI) films are crucial for flexible displays and wearable devices, but their development is limited by high costs relatively low mechanical properties.

Language: Английский

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Transparent Poly(amide-imide)s with Low Coefficient of Thermal Expansion from Trifluoromethylated Trimellitic Anhydride

Polymers, Journal Year: 2025, Volume and Issue: 17(3), P. 309 - 309

Published: Jan. 24, 2025

Making transparent aromatic polymers with high Tg and low thermal expansion behavior, like glass, is challenging. We report soluble poly(amide-imide)s (PAIs) dimensional stability synthesized from the new monomer, trifluoromethylated trimellitic anhydride. Insertion of trifluoromethyl (CF3) groups into polymer chains enhanced solubility optical properties without sacrificing stability. Model reactions were utilized to study how CF3 group in anhydride affects polymerization reaction diamine monomers, a series PAIs synthesized. All polar organic solvents can be solution-cast nearly colorless flexible freestanding films. The obtained PAI films possessed (Td5: 437–452 °C N2) transparency (84~87% transmittance at 550 nm). Interestingly, prepared this exhibited thermodimensional CTE values 9 26 ppm/°C. poly(amide-imide) film value finds its application display devices that require form factors.

Language: Английский

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In Situ Preparation of Siloxane-Linked Colorless Polyimides with Low Dielectric Constant

ACS Applied Polymer Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 20, 2025

Language: Английский

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Modification of Transparent Polyimide with High Aspect Ratio Nanowires to Simultaneously Improve the Thermal Conductivity, Haze, and Mechanical Properties

Macromolecular Rapid Communications, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Abstract Currently, the high light transmittance and haze thermally conductive polyimide film with excellent comprehensive performance exhibits great application prospects, while there are still challenges for achieving. Here, boehmite nanowires (BhNs) an aspect ratio up to 60 modification of transparent (CPI) derived from polymerization fluorodiamine fluorodianhydride, prepared. Due unique size orientation distribution BhNs in CPI films, as prepared CPI‐BhN composite films show in‐plane thermal conductivity 5.89 W m −1 K , which is almost order magnitude higher than that pure (0.626 ). Meantime, optimal a 52.9% at 550 nm 35.3%. In addition, form strong hydrogen bond polymer chains, enhancing mechanical properties films. Studies on stability, fatigue resistance, flame retardancy indicate have performances. These findings provide new idea design fabrication high‐performance new‐generation optoelectronic devices.

Language: Английский

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Colorless Transparent Polyimides with Balanced Dielectric and Optical Properties

Published: March 21, 2025

Language: Английский

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Synthesis and Characterization of High Glass Transition Temperature Colorless Polyimides Containing Hydrogen Bonding Carbazole Diamine for Optoelectronic Devices

ACS Applied Polymer Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

Maintaining ultrahigh heat resistance, a low thermal expansion coefficient (CTE), and adequate colorless transparency concurrently poses significant challenge for polyimides (CPIs), especially as substrate materials flexible optoelectronic devices. In this work, we designed synthesized hydrogen-bonding carbazole tetraphenyl aromatic diamine, 2,7-bis[2-trifluoromethyl-4-aminophenyl]-9H-carbazole (2,7-CPFDA). The corresponding polyimide (PI) films were via the copolymerization of 2,7-CPFDA 2,2′-bis(trifluoromethyl)benzidine (TFDB) with 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) at varying molar ratios. All copolymer PI presented high resistance 5% weight loss temperatures (Td5) between 552 563 °C, glass transition (Tg) ranged from 354 to 380 °C. As content increased, CTE decreased 17.6 10.4 ppm K–1, while tensile modulus (E) rose 5.7 6.7 GPa, elongation break (ε) improved 5.4% 28%. When BPDA was substituted 9,10-diphenyl-9,10-bis(trifluoromethyl)-9,10-dihydroanthracene-2,3,6,7-tetraacid (6FDPDA) 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), CPI exhibited overall favorable properties. Notably, C–PI-7 Tg 456 excellent mechanical properties (E = ε 11.9%), (8.7 K–1), transmittance 450 nm (T450 86.1%), thereby meeting performance requirements electronic

Language: Английский

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Synthesis and Characterization of a Colorless Polyimide Membrane With a Low Dielectric Constant

Journal of Polymer Science, Journal Year: 2025, Volume and Issue: unknown

Published: March 28, 2025

ABSTRACT Recently, colorless polyimide (CPI) substrates with excellent optical properties, a suitable thermal stability, and low dielectric constant have become key factor in the development of wearable portable flexible electronic devices. A series branched CPI films has been successfully prepared here by using self‐made triamine (1,3,5‐triple (2‐trifluoromethyl‐4‐aminobenzyl) benzene [TFAPOB]). By adjusting ratio cyclopentanone bis‐spironorbornane tetracarboxylic dianhydride (CPODA) monomer 4,4‐(hexafluoroisopropyl)‐diphthalic anhydride (6FDA) monomer, an optimal film (CBPI‐10) highest content CPODA was obtained. This could achieve transmittance 90% at 550 nm glass transition temperature 311°C. result be explained fact that CBPI‐10 contained least amount trifluoromethyl side groups largest alicyclic units, which resulted generation minimum free volume fraction (according to molecular dynamics simulations) disruption conjugation effect between rings. Additionally, it is worth mentioning these only 2.17, significantly higher than those traditional polymers (2.61–2.72). Consequently, present study focused on developing novel manufacturing scheme for CPIs, guidance importance design advancement display technology.

Language: Английский

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Synthesis and properties of high heat-resistant transparent polyimides containing terphenyl skeleton

European Polymer Journal, Journal Year: 2025, Volume and Issue: unknown, P. 113924 - 113924

Published: March 1, 2025

Language: Английский

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Ultra-heat resistance and low CTE polyimides with spirobis(indene)bis(benzoxazole)-benzimidazole unite for flexible substrate applications

European Polymer Journal, Journal Year: 2025, Volume and Issue: unknown, P. 113923 - 113923

Published: March 1, 2025

Language: Английский

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