Preparation of two–dimensional gradient fillers reinforced polymer nanocomposites for high–performance energy storage of dielectric capacitors

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 101, P. 113886 - 113886

Published: Sept. 28, 2024

Language: Английский

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Enhanced high-temperature energy storage performance in all-organic dielectric films through synergistic crosslinking of chemical and physical interaction

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 500, P. 157312 - 157312

Published: Nov. 1, 2024

Language: Английский

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Dipole Glass Polymer with High Dielectric Constant Based on Side Chain Functionalized Poly(ether ether ketone)

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

Published: Feb. 27, 2025

Language: Английский

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Exceptionally High-Temperature-Resistant Kapton-Type Polyimides with Tg > 520 °C: Synthesis via Incorporation of Spirobis(indene)-bis(benzoxazole)-Containing Diamines

Polymers, Journal Year: 2025, Volume and Issue: 17(7), P. 832 - 832

Published: March 21, 2025

Polyimides (PIs), recognized for their exceptional thermal stability, are extensively employed in advanced applications, including aerospace, flexible displays, solar cells, flame-retardant materials, and high-temperature filtration materials. However, with the continuous advancements science technology, demand improved performance of PIs these application areas has increased significantly. In this study, four spirobis(indene)-bis(benzoxazole) diamine monomers (5a, 5aa, 5b 5bb) were designed synthesized. These copolymerized pyromellitic dianhydride (PMDA) 4,4-diaminodiphenylmethane (ODA) to develop Kapton-type PIs. By varying copolymerization molar ratios different diamines, a series novel ultrahigh-temperature-resistant PI films successfully prepared, it was found that incorporating highly rigid twisted structure into matrix enhances rigidity polymer chains restricts mobility, thereby significantly improving films. When 5a ODA at 1:9 4:6, glass transition temperature (Tg) from 396 °C 467 >520 °C, respectively. also exhibit mechanical properties, modulus increasing 1.6 GPa 4.7 GPa, while demonstrating low dielectric performance, as evidenced by decrease constant (Dk) 3.51 3.08 under 10 GHz high-frequency electric field. Additionally, molecular dynamics simulations further explore relationships between structure, condensed states, film providing theoretical guidance development polymers ultrahigh resistance superior overall performance.

Language: Английский

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Synchronously enhanced breakdown strength and energy storage ability of cellulose acetate flexible films via introducing ultra-low content of carbonized polymer dots

Carbohydrate Polymers, Journal Year: 2024, Volume and Issue: 347, P. 122752 - 122752

Published: Sept. 13, 2024

Language: Английский

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Achieving High Energy Storage Capability of Polypropylene Films through Clean Electron Beam Irradiation Induced Grafting Strategy

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 26, 2024

In order to develop polypropylene (PP) based dielectric materials with high and energy storage properties, PP grafted polystyrene films (PP-g-PS) different grafting content have been prepared by electron beam irradiation method. Free radicals were generated in the chains during also enhanced polarity of due oxidation reaction. The results shown that presence PS introduced smaller spherical crystals, which led more interfacial regions increased polarization. DFT simulations TSDC proved deeper traps, could effectively trap carriers at speeds reduce carrier mobility. When was 8 wt %, PP-g-PS film achieved 600 MV/m breakdown strength, 5.43 J/cm3 discharge density, than 96% charge–discharge efficiency. What's more, significantly improved high-temperature properties PP. At 110 °C, density (8%) is 3.44 J/cm3, 93% higher (1.78 J/cm3). And electric field strength 440 MV/m, efficiency still exceeds 96%. This study provides a simple feasible strategy for development high-performance PP-based films.

Language: Английский

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A molecular design strategy to develop all‐organic crosslinked polyetherimide film with high discharged energy density at 150°C

Journal of Applied Polymer Science, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 2, 2024

Abstract Miniaturization and lightweight of power systems urgently ask for polymer dielectrics with high discharged energy density at 150°C. Herein, a molecular design strategy is built to prepare new crosslinkable polyetherimide films (PEIDx, x the molar ratio dianhydride amines) through simultaneously improving polarization degree reducing residual polarization. Thermal, mechanical, dielectric properties PEIDx improve as increases. PEID0.92 shows best integrated performances, especially its (5.46 J cm −3 , 10 Hz 454 MV m −1 ) higher than those reported storage 150°C, charge–discharge efficiency 80.14%. The outstanding performance attributed unique structure. Specifically, use nonplanar low‐alkaline aliphatic cyclic diamine effectively improves macromolecules; while crosslinking alkynyl groups limits macromolecular movement, thus ensuring heat resistance low

Language: Английский

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Significant improvements in energy density and efficiency of CQDs/PVDF-based dielectric nanocomposite via stretching effect

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 108, P. 115027 - 115027

Published: Dec. 18, 2024

Language: Английский

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