Enhanced mechanical and thermal properties of γ-allyloxymethyl 18-crown-6 and polyimide composites through hydrosilylation crosslinking

Shi, Chuqi; Liu, Shumei; Yang, Li; Zhao, Jianqing; Huang, Haohao

doi:10.1016/j.cclet.2018.11.012

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…The dielectric constant can be adjusted from 3.64 to 3.17, and the dielectric loss can be reduced from 5.6‰ to 4.1‰. Chuqi Shi et.al prepared PI composite membranes, ODA and PMDA, mixed with crown ether and sessiloxane (OAPrS) in their earlier research [61]. The dielectric constants were low, at 2.43-3.59, but their Young moduli were only about 5.89 GPa, the tensile strength values were about 146.8 MPa, and the Tg values were about 360.1 • C. The properties outside of dielectric properties are lower than the results of our work.…”

Section: Discussionmentioning

confidence: 99%

Crown Ether Copolymerized Polyimide Film: Enhanced Mechanical, Thermal Properties and Low Dielectric Constant under High Frequency

Li,

Wang,

Ding

et al. 2024

Polymers

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Polymer materials with a low dielectric constant and low dielectric loss have the potential to be applied to high-frequency signal transmissions, such as mobile phone antennas and millimeter wave radars. Two types of diamines, 4,4′-diamino-p-tetraphenyl (DPT) and crown ether diamine (CED), were prepared for ternary copolymerization with BPDA in this study. Cross-links with molecular chains were formed, increasing molecular chain distance by utilizing rings of CED. The MPI films exhibit a good thermal performance with the increase in CED addition, with Tg > 380 °C and CTE from −4 × 10−6 K−1 to 5 × 10−6 K−1. The Young’s modulus can reach 8.6 GPa, and the tensile strength is above 200 MPa when 5% and 7% CED are introduced. These MPI films exhibit good mechanical performances. The dielectric constant of PI−10% film can go as low as 3.17. Meanwhile, the relationship between dielectric properties and molecular structure has been demonstrated by Molecular Simulation (MS). PI molecules are separated by low dielectric groups, resulting in a decrease in the dielectric constant.

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Section: Discussionmentioning

confidence: 99%

Crown Ether Copolymerized Polyimide Film: Enhanced Mechanical, Thermal Properties and Low Dielectric Constant under High Frequency

Li,

Wang,

Ding

et al. 2024

Polymers

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“…In order to enhance the E b and U e of polymer-based composites, tremendous effort has been made [14][15][16]. This study found that adding wide band-gap 2D fillers into the polymer matrix can enhance the E b of composites.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Energy Storage Performance of PVDF-Based Composites Using BN@PDA Sheets and Titania Nanosheets

et al. 2022

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With the rapid development of modern electrical and electronic applications, the demand for high-performance film capacitors is becoming increasingly urgent. The energy density of a capacitor is dependent on permittivity and breakdown strength. However, the development of polymer-based composites with both high permittivity (εr) and breakdown strength (Eb) remains a huge challenge. In this work, a strategy of doping synergistic dual-fillers with complementary functionalities into polymer is demonstrated, by which high εr and Eb are obtained simultaneously. Small-sized titania nanosheets (STNSs) with high εr and high-insulating boron nitride sheets coated with polydopamine on the surface (BN@PDA) were introduced into poly(vinylidene fluoride) (PVDF) to prepare a ternary composite. Remarkably, a PVDF-based composite with 1 wt% BN@PDA and 0.5 wt% STNSs (1 wt% PVDF/BN@PDA−STNSs) shows an excellent energy storage performance, including a high εr of ~13.9 at 1 Hz, a superior Eb of ~440 kV/mm, and a high discharged energy density Ue of ~12.1 J/cm3. Moreover, the simulation results confirm that BN@PDA sheets improve breakdown strength and STNSs boost polarization, which is consistent with the experimental results. This contribution provides a new design paradigm for energy storage dielectrics.

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“…Furthermore, the thermal and mechanical properties of the polymer can be greatly improved due to the formation of the space network structure after cross-linking. 28,29 In recent years, the introduction of phenylethynyl groups into polyimide and other high-performance resins has become more extensive. 30,31 Herein, combining the advantages of PEI and phenylethynyl groups, self-cross-linkable 4-phenylethynylphthalic anhydride (PEPA)-terminated ether imide oligomers derived from 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl] propane dianhydride (BPADA) and 4,4′-oxydianiline (4,4′-ODA) were prepared, as shown in Figure 1a.…”

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confidence: 99%

Enhanced Discharged Efficiency and High Energy Density at Elevated Temperature in Polymer Dielectric via Manipulating Relaxation Behavior

et al. 2020

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Polymer dielectrics with excellent dielectric properties and energy storage performance under elevated temperature are urgently needed in electrical power systems. Polyetherimide (PEI), which is supposed to be the most promising candidate among polymer dielectric materials, has a limitation for high-temperature dielectric applications especially at high electric field owing to secondary relaxation. Herein, a series of self-cross-linkable oligomers are prepared by combining the advantages of PEI and phenylethynyl groups. Cross-linked polymer dielectric films with enhanced voltage resistance and low leakage current density are obtained by cross-linking under oxygen. The occurrence of β-relaxation is diminished by cross-linking, which makes polymer dielectrics exhibit desirable dielectric stability over a broad temperature and frequency range. Particularly, the dielectric loss of c-10%PEPA-PEI at 1000 Hz is 0.0037 and 0.0043 at room temperature and 150°C, respectively. Simultaneously, the polymer dielectric maintains a still low dielectric loss (<0.010) between 10 2 and 10 6 Hz. Furthermore, c-10%PEPA-PEI possesses excellent hightemperature energy storage performance owing to much interchain reaction originating from proper chain length, and exhibits ultrahigh chargedischarge efficiency (>95.0%) and improved energy density (3.6 J/cm 3 ) at 150°C. The authors believe that these cross-linked films showing excellent dielectric performance have a promising future in high-temperature applications.

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Enhanced mechanical and thermal properties of γ-allyloxymethyl 18-crown-6 and polyimide composites through hydrosilylation crosslinking

Cited by 7 publications

References 23 publications

Crown Ether Copolymerized Polyimide Film: Enhanced Mechanical, Thermal Properties and Low Dielectric Constant under High Frequency

Crown Ether Copolymerized Polyimide Film: Enhanced Mechanical, Thermal Properties and Low Dielectric Constant under High Frequency

Enhanced Energy Storage Performance of PVDF-Based Composites Using BN@PDA Sheets and Titania Nanosheets

Enhanced Discharged Efficiency and High Energy Density at Elevated Temperature in Polymer Dielectric via Manipulating Relaxation Behavior

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