scholarly journals Radiation-Induced Transient Currents in Films of Poly(arylene ether ketone) Including Phthalide Moiety

Polymers ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 13
Author(s):  
Evgenii D. Pozhidaev ◽  
Vera V. Shaposhnikova ◽  
Alexey R. Tameev ◽  
Andrey E. Abrameshin
Keyword(s):  
Electric Fields ◽  
Carrier Transport ◽  
Protective Coatings ◽  
Threshold Field ◽  
Electrostatic Discharges ◽  
Arylene Ether ◽  
Multiple Trapping ◽  
Radiation Induced ◽  
Ether Ketone ◽  
Semi Empirical

The electrical properties of thin films of poly(arylene ether ketone) copolymers (co-PAEKs) with a fraction of phthalide-containing units of 3, 5, and 50 mol% in the main chain were investigated by using radiation-induced conductivity (RIC) measurements. Transient current signals and current-voltage (I-V) characteristics were obtained by exposing 20 ÷ 25 μm thick films of the co-PAEKs to monoenergetic electron pulses with energy ranging from 3 to 50 keV in an electric field ranging from 5 to 40 V/μm. The Rose-Fowler-Vaisberg semi-empirical model based on a multiple trapping formalism was used for an analysis of the RIC data, and the parameters of the highly dispersive charge carrier transport were evaluated. The analysis revealed that charge carriers moved in isolation from each other, and the applied electric fields were below the threshold field triggering the switching effect (a reversible high-to-low resistivity transition) in the co-PAEK films. It was also found that the co-PAEK films, due to the super-linear I-V characteristics, are highly resistant to electrostatic discharges arising from the effects of ionizing radiation. This property is important for the development of protective coatings for electronic devices.

scholarly journals Radiation Induced Transient Currents in Films of Poly(Arylene Ether Ketone) Including Phthalide Moiety

2019 ◽  
Author(s):  
Evgenii Pozhidaev ◽  
Vera Shaposhnikova ◽  
Aleksey Tameev ◽  
Andrey Abrameshin
Keyword(s):  
Electric Fields ◽  
Carrier Transport ◽  
Protective Coatings ◽  
Threshold Field ◽  
Electrostatic Discharges ◽  
Arylene Ether ◽  
Multiple Trapping ◽  
Radiation Induced ◽  
Ether Ketone ◽  
Semi Empirical

Electrical properties of the thin films of poly(arylene ether ketone) copolymers (co-PAEKs) with the fraction of phthalide-containing units of 3, 5 and 50 mol% in the main chain were investigated by using radiation induced conductivity (RIC) measurements. Transient current signals and current-voltage (I-V) characteristics were obtained under exposing 20÷25 thick films of the co-PAEKs to monoenergetic electron pulses of the energy ranged from 3 to 50 keV in the electric field ranged from 5 to 40 V/μm. The Rose-Fowler-Vaisberg semi-empirical model based on a multiple trapping formalism was used for an analysis of the RIC data and the parameters of the highly dispersive charge carrier transport were evaluated. The analysis revealed that charge carriers moved in isolation from each other and the applied electric fields were below the threshold field triggering the switching effect (a reversible high-to-low resistivity transition) in the co-PAEK films. It was also found that the co-PAEK films due to the super-linear I-V characteristics are highly resistant to electrostatic discharges arising from the effects of ionizing radiation. This property is important for the development of protective coatings for electronic devices.

scholarly journals Time-Resolved Radiation-Induced Conductivity of Polyimide and Its Description Using the Multiple Trapping Formalism

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2061 ◽  
Author(s):  
Andrey Tyutnev ◽  
Vladimir Saenko ◽  
Aleksei Zhadov ◽  
Evgenii Pozhidaev
Keyword(s):  
Carrier Transport ◽  
Main Idea ◽  
Model Parameters ◽  
Mechanical And Thermal Properties ◽  
Current Sensing ◽  
Time Resolved ◽  
Multiple Trapping ◽  
Radiation Fluxes ◽  
Radiation Induced ◽  
Potential Decay

Polymer dielectrics subjected to intense radiation fluxes exhibit a radiation-induced conductivity (RIC). Polyimide is a good dielectric with excellent mechanical and thermal properties featuring high radiation resistance currently widely used in the spacecraft industry. Its RIC has been extensively studied in several laboratories. The purpose of the present study is to make a direct measurement of the RIC for both pulsed and continuous irradiation using a current sensing technique, which is contrary to the indirect method employing a surface-potential decay technique that is now preferred by spacecraft charging engineers. Our experiments are done in a small-signal regime excluding any recombination and dose effects. In combination with existing computer codes, we managed to develop further the conventional multiple trapping formalism and the RIC theory based on it. The main idea is to supplement an exponential trap distribution responsible for a dominant dispersive carrier transport in polymers with a small concentration of inherent deep traps which may or may not have an energy distribution. In line with this reasoning, we propose a tentative set of RIC model parameters for polyimide that accounts for the observed experimental data. The findings and their implications are discussed in a broad context of previous studies.

Analysis of the results of medium-energy electrons on the protective and thermoregulatory coatings of high-orbit satellites

2018 ◽  
pp. 156-171
Author(s):  
A. M. Shamayev ◽  
M. D. Ozersky
Keyword(s):  
Structural Changes ◽  
Protective Coatings ◽  
Experimental Studies ◽  
Thermal Control ◽  
Space Vehicles ◽  
Medium Energy ◽  
Electrostatic Discharges ◽  
High Orbit ◽  
Thermal Control Coatings ◽  
Solar Batteries

The results of experimental studies of the effect of electron irradiation on K-208 and CMG glasses used for manufacturing protective coatings of solar batteries and thermal control coatings of space vehicles are analyzed. It is shown that the caused electrostatic discharges lead to structural changes in the surfaces of the glasses studied. The goals of further studies of the influence of proton and electronproton effects on the properties of such coatings are outlined. 

Enhanced CO2 permeability of thermal crosslinking membrane via sulfonation/desulfonation of phenolphthalein-based cardo poly(arylene ether ketone)

2020 ◽  
Vol 598 ◽  
pp. 117824 ◽  
Author(s):  
Ruisong Xu ◽  
Lin Li ◽  
Mengjie Hou ◽  
Jiajia Xue ◽  
Yuzhe Liu ◽  
...  
Keyword(s):  
Arylene Ether ◽  
Thermal Crosslinking ◽  
Ether Ketone

Crosslinked sulfonated poly(arylene ether ketone) with pendant carboxylic acid group via poly(ethylene glycol) for proton exchange membrane

2010 ◽  
Vol 118 (6) ◽  
pp. 3318-3323 ◽  
Author(s):  
Zhiliang Li ◽  
Xincai Liu ◽  
Danming Chao ◽  
Xiaofeng Lu ◽  
Libing He ◽  
...  
Keyword(s):  
Proton Exchange Membrane ◽  
Acid Group ◽  
Proton Exchange ◽  
Poly Ethylene Glycol ◽  
Carboxylic Acid Group ◽  
Arylene Ether ◽  
Ether Ketone ◽  
Poly Ethylene ◽  
Exchange Membrane ◽  
Sulfonated Poly

scholarly journals Sulfonated Binaphthyl-Containing Poly(arylene ether ketone)s with Rigid Backbone and Excellent Film-Forming Capability for Proton Exchange Membranes

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1287 ◽  
Author(s):  
Wenmeng Zhang ◽  
Shaoyun Chen ◽  
Dongyang Chen ◽  
Zhuoliang Ye
Keyword(s):  
Mechanical Properties ◽  
Proton Conductivity ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Thermal Stabilities ◽  
Chemical Structures ◽  
Arylene Ether ◽  
Film Forming ◽  
Ether Ketone ◽  
Microscopic Morphology

Sterically hindered (S)-1,1′-binaphthyl-2,2′-diol had been successfully copolymerized with 4,4′-sulfonyldiphenol and 4,4′-difluorobenzophenone to yield fibrous poly(arylene ether ketone)s (PAEKs) containing various amounts of binaphthyl unit, which was then selectively and efficiently sulfonated using ClSO3H to yield sulfonated poly(arylene ether ketone)s (SPAEKs) with ion exchange capacities (IECs) ranging from 1.40 to 1.89 mmol·g−1. The chemical structures of the polymers were confirmed by 2D 1H–1H COSY NMR and FT-IR. The thermal properties, water uptake, swelling ratio, proton conductivity, oxidative stability and mechanical properties of SPAEKs were investigated in detail. It was found that the conjugated but non-coplanar structure of binaphthyl unit endorsed excellent solubility and film-forming capability to SPAEKs. The SPAEK-50 with an IEC of 1.89 mmol·g−1 exhibited a proton conductivity of 102 mS·cm−1 at 30 °C, much higher than that of the state-of-the-art Nafion N212 membrane and those of many previously reported aromatic analogs, which may be attributed to the likely large intrinsic free volume of SPAEKs created by the highly twisted chain structures and the desirable microscopic morphology. Along with the remarkable water affinity, thermal stabilities and mechanical properties, the SPAEKs were demonstrated to be promising proton exchange membrane (PEM) candidates for potential membrane separations.

scholarly journals Thiophene-based poly(arylene ether ketone)s: 2. Thermal and mechanical properties of amorphous systems using bis(p-fluorobenzoyl)aryl monomers

Polymer ◽  
1993 ◽  
Vol 34 (4) ◽  
pp. 807-812 ◽  
Author(s):  
A.B. Brennan ◽  
Y.Q. Wang ◽  
J.M. DeSimone ◽  
S. Stompel ◽  
E.T. Samulski
Keyword(s):  
Mechanical Properties ◽  
Thermal And Mechanical Properties ◽  
Amorphous Systems ◽  
Arylene Ether ◽  
Ether Ketone

Effect of poly(arylene ether ketone)s of different chemical constitutions on adhesion properties of epoxyamine binder

2007 ◽  
Vol 49 (5) ◽  
pp. 558-563 ◽  
Author(s):  
A. S. Volkov ◽  
Yu. A. Gorbatkina ◽  
I. Yu. Gorbunova ◽  
M. L. Kerber ◽  
S. N. Salazkin ◽  
...  
Keyword(s):  
Adhesion Properties ◽  
Arylene Ether ◽  
Ether Ketone
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