Swift Heavy ion irradiation effects on dielectric constant and dielectric loss in poly (ether ether ketone) (PEEK)

Kalia, Rajesh; Sharma, Jyoti; Kalia, Sapna

doi:10.5185/amp.2018/986

Cited by 6 publications

(6 citation statements)

References 20 publications

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“…For the amor-PLLA film, the dielectric constant shows a peak near T g . With increasing temperature to approach T g , the amor-PLLA film with α-relaxation near T g will show a micro-Brownian motion of the whole chain, and the dipoles tend to reorient easily due to the thermally activated motions of the main chain segments, which will lead to the enhancement of the dielectric constant. , With further increasing temperature, thermal agitation induces randomization of the dipoles, which results in a decrease in ε r . ,, Similar phenomena were also reported in bisphenol A-polycarbonate (BPA-PC) and poly(ether ether ketone) (PEEK) films. , …”

Section: Resultssupporting

confidence: 58%

“…37,44 With further increasing temperature, thermal agitation induces randomization of the dipoles, which results in a decrease in ε r . 37,45,46 Similar phenomena were also reported in bisphenol A-polycarbonate (BPA-PC) and poly(ether ether ketone) (PEEK) films. 45,46 Furthermore, UV−vis absorption spectra measurements were performed to investigate the optical bandgaps of PLLA films.…”

Section: Resultssupporting

confidence: 52%

“…37,45,46 Similar phenomena were also reported in bisphenol A-polycarbonate (BPA-PC) and poly(ether ether ketone) (PEEK) films. 45,46 Furthermore, UV−vis absorption spectra measurements were performed to investigate the optical bandgaps of PLLA films. Generally, the optical bandgap can be determined from UV−vis absorption spectra according to Tauc expression: 47 h h E ( ) A( )…”

Section: Resultssupporting

confidence: 52%

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Biodegradable Poly(l-Lactic Acid) Films with Excellent Cycle Stability and High Dielectric Energy Storage Performance

Jia

Ding

Bao

et al. 2022

ACS Appl. Energy Mater.

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Polymer-based film capacitors play key roles in numerous applications, such as converter/inverter systems in hybrid electric vehicles (HEVs), smart grids, and pulsed power sources. However, nearly all actively studied dielectric polymers are nondegradable. In this work, we prepare flexible biodegradable poly(L-lactic acid) (PLLA) films via a simple solvent casting method and achieve enhanced dielectric performances by polymer crystallization. The recoverable energy density (U rec ) with charge−discharge efficiency (η) of 90% was improved from ∼2.9 J/cm 3 for amorphous PLLA to ∼5.7 J/cm 3 for the crystallized PLLA film at room temperature. Under 200 MV/m at 85 °C (the operation conditions of commercial biaxially oriented polypropylene-based capacitors in HEVs), U rec of 0.82 J/cm 3 with η of 95% is achieved in the crystallized PLLA film, which is much higher than that of BOPP (below 0.5 J/cm 3 ). In particular, the remarkable cyclic stability of the crystallized PLLA film is demonstrated by charge−discharge tests for 20 000 cycles at both room temperature and 85 °C under 200 MV/m. Moreover, the low C/(H+O) atom ratio helps metalized PLLA films exhibit a valuable self-healing ability after breakdown. With excellent recoverable energy density, high efficiency, good cyclic reliability, low-cost preparation method, self-healing ability, and eco-friendliness, the crystallized biodegradable PLLA film provides an eco-friendly and high-performance candidate to develop high-energy-storage capacitors.

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Section: Resultssupporting

confidence: 58%

Section: Resultssupporting

confidence: 52%

Section: Resultssupporting

confidence: 52%

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Biodegradable Poly(l-Lactic Acid) Films with Excellent Cycle Stability and High Dielectric Energy Storage Performance

Jia

Ding

Bao

et al. 2022

ACS Appl. Energy Mater.

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“…According to Kirkwood's model, in the operational temperature range, if the molecular configuration, as well as inter and intra molecular interactions, are not changed, the dielectric constant is determined by 1/T rule i.e. the dielectric constant (ε') should decrease with increasing temperature [9][10][11].…”

Section: Resultsmentioning

confidence: 99%

Doping effects on dielectric constant/dielectric loss measurements in Vectra-A, liquid crystal copolyester

Kalia

2019

AIP Conference Proceedings

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The most significant advantage of studying the charge storage mechanism of Vectra-A, Liquid Crystal Copolyester through Dielectric Spectroscopy (DS) is their complex structure, which can be physically or chemically tailored for specific applications which make it suitable for charge storing devices like Micro-Electro-Mechanical Systems (MEMS). The variation of dielectric constant (ε') and dielectric loss (ε'') in the temperature interval (25 o C to 250 o C) for pristine samples of Vectra-A at different frequencies (1 kHz to 1 MHz) have been investigated.

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“…5 As a consequence of these advantages, especially the excellent mechanical stability under high temperature and radiation, PEEK can be used in a wide variety of fields, such as aerospace, nuclear industry, automotive, electronics, and chemical medicine industries, in various types of not only moldings but also composites and laminates. [6][7][8] PEEK also exhibits superior chemical resistance which allowed it to work effectively as a metal replacement in a harsh environment. 9 Because PEEK is inert to most common solvents and can resist a wide range of organic and inorganic liquids, coating metals with PEEK can protect them from corrosion.…”

Section: Introductionmentioning

confidence: 99%

Influence of 25 MeV Si ions and 25 MeV O ions on the chemical and structural properties of PEEK films

Yang

2020

High Performance Polymers

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Poly (ether ether ketone) (PEEK) material can be used in a wide variety of fields, such as the aerospace, automotive, electronics, and nuclear industries. In this research, the irradiation effect of 25 MeV Si ions and 25 MeV O ions on the PEEK films was studied, focusing on the changes in chemical and structural properties. By analyzing surface morphology and microstructure evolution of the PEEK films after 25 MeV Si ion and 25 MeV O ion irradiation, particles were generated on surface of the PEEK after 25 MeV Si ion irradiation and black dots were generated on surface of the PEEK after 25 MeV O ion irradiation. The irradiation reduced the surface roughness of the PEEK films from the atomic force microscopy (AFM) results. The Fourier transform infrared (FTIR) results indicated that the groups and structure of the material were not changed by irradiation. The X-ray photoelectron spectroscopy (XPS) results showed that the contents of the chemical bonds C–C, C=O increased first and then decreased with the increasing of the fluences. The generated free radicals were observed by the electron paramagnetic resonance spectroscopy (EPR) at room temperature and the irradiation degradation mechanisms were analyzed. Thermal properties of the PEEK irradiated by 25 MeV O ions, indicating that a new secondary crystallization peak was found during the cooling stage. Consequently, the low fluences irradiation improves in the viscoelasticity and mechanical properties of PEEK films, while the high fluences irradiation reduces its performance.

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Swift Heavy ion irradiation effects on dielectric constant and dielectric loss in poly (ether ether ketone) (PEEK)

Cited by 6 publications

References 20 publications

Biodegradable Poly(l-Lactic Acid) Films with Excellent Cycle Stability and High Dielectric Energy Storage Performance

Biodegradable Poly(l-Lactic Acid) Films with Excellent Cycle Stability and High Dielectric Energy Storage Performance

Doping effects on dielectric constant/dielectric loss measurements in Vectra-A, liquid crystal copolyester

Influence of 25 MeV Si ions and 25 MeV O ions on the chemical and structural properties of PEEK films

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