Structural analysis and dielectric property of novel conjugated polycyanurates

Zhao, Xiongyan; Wang, Mingzhu; Ji, Jiao-Qing; Wang, Tianheng; Yang, Fei; Du, Juan-Min

doi:10.1002/pen.23628

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…Wave-transmitting and high-temperature resistant materials have become one of the most important multifunctional medium materials in aeronautics and astronautics, which are used as a window material to protect the normal operation of communication, telemetry, guidance, detonation and other systems of spacecraft in harsh environments [1][2][3]. To date, the common of employed wave-transmitting and hightemperature materials are almost quartz fibrereinforced polymer composites and ceramic-matrix composites [4][5][6][7][8][9][10][11]. And they have attracted a great deal of attention owing to their fundamental importance and applicability in various modern technologies.…”

Section: Introductionmentioning

confidence: 99%

High-temperature resistance and wave-transmitting quartz-fibre/polyimide composite

Wu¹,

Xiao²,

Zou³

et al. 2022

Plastics, Rubber and Composites

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Here, composite based on quartz fibre-reinforced fluoro-polyimide was fabricated using a hot press process, which was reported having well thermal and dielectric properties. The polyimide exhibited extremely high glass transition temperature (T g ) up to 471°C, and 5% weight loss temperature (T 5 ) about 560°C both in nitrogen and air. Also, optimisation of processing parameters of composite was investigated. Moreover, the quartz fibre/polyimide composite possessed excellent high-temperature mechanical properties due to the high T g . Importantly, the composite exhibited excellent dielectric performance. Especially, the dielectric constant values had remained basically unchanged of 3.43-3.46 at 400°C in the frequency range of 7-18 GHz, indicative of a remarkable wave-transmitting property. Besides, the transmission efficiency of the composite was up to 83% in the frequency range of 7 -18 GHz. This study can serve as a basis for rapid evaluation of the high heat resistance and waving-transmitting property polyimide composite in various application environments.

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Section: Introductionmentioning

confidence: 99%

High-temperature resistance and wave-transmitting quartz-fibre/polyimide composite

Wu¹,

Xiao²,

Zou³

et al. 2022

Plastics, Rubber and Composites

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“…In other words, the catalytic cyclotrimerization was not active enough at processing temperature. However, the characteristic absorption bands of —O—C≡N were not observed at the FTIR spectra of CoAt(III)/BPAF/BACY system, it suggested that BPAF had enough activity to cure BACY completely at 200 °C within 3 h. Moreover, in all curves, the absorption bands at 1612, 1501, and 1459 cm −1 were attributed to the stretching vibrations of benzene ring backbone, and the characteristic absorptions at 2878 and 2971 cm −1 were corresponded to C—H . In the spectra of CoAt(III)/BPAF/BACY system, the characteristic absorption bands at 927 and 966 cm −1 referred to C—F of trifluoromethyl groups.…”

Section: Resultsmentioning

confidence: 89%

Preparation and properties of 4,4′‐(hexafluoroisopropylidene) diphenol cured 2,2‐bis(4‐cyanatophenyl) propane

Hou

Liu

et al. 2016

J of Applied Polymer Sci

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A novel easily curing system of 2,2-bis(4-cyanatophenyl) propane(BACY) was prepared by employing 4,4 0 -(Hexafluoroisopropylidene) Diphenol (BPAF) as modifier. The curing efficiency of BPAF was evaluated by means of differential scanning calorimetry (DSC) and Fourier translation infrared spectroscopy analysis (FTIR). It was found that the exothermic peak temperature (T p ) was 168 8C when the content of BPAF/BACY was 15/85 by weight, while the temperature of BACY was 215 8C under the same conditions when trace of cobalt(III) acetylacetonate(CoAt(III)) was added. Besides, BPAF/BACY system owned outstanding properties including excellent curing characteristics, high shear strength, remarkable dielectric properties and high thermal stability in contrast to BACY, 4,4 0 -(1-methylethylidene) bisphenol(BPA)/BACY, and nonylphenol(NoP)/BACY systems. Moreover, the properties of cured BPAF/ BACY modified by different proportions of BPAF were studied in detail. It was shown that moderate BPAF was conducive to most properties of polycyanurate, and the optimal proportion of BPAF/BACY was 15/85 by weight. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44518.

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“…Sibel et al concluded that PCN films with controllable dielectrical properties at a wide range of frequency and temperature can be used in aerospace and microelectronic applications as functional surface coating materials. Xiong‐Yan Zhao et al show that the dielectric constant of the novel conjugated polycyanurate thin films decreased with increasing frequency, while in contrast, the dielectric loss factor increased with the increasing frequency.…”

Section: Introductionmentioning

confidence: 99%

Thickness dependence of ac electrical conductivity and dielectric behavior of plasma polymerized 1, 1, 3, 3–tetramethoxypropane thin films

Afroze

Bhuiyan

2017

Polymer Engineering & Sci

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AC electrical conductivity (σac), dielectric constant (ɛ′), and dielectric loss tangent (tan δ) of plasma polymerized 1, 1, 3, 3‐tetramethoxy‐propane (PPTMP) thin films of thicknesses 100, 150, and 200 nm prepared by plasma polymerization technique using a capacitively coupled glow discharge reactor have been investigated in the frequency range of 30–106 Hz. It is observed that σac increases as frequency increases with a higher slope in the medium frequency (<105Hz) region in the PPTMP thin films of three thicknesses. These observations suggest that the conduction may be dominated by hopping of carriers between the localized states. The general trend of ɛ′ is to increase with increasing thickness, ɛ′ remains independent of frequency upto about 104Hz and then falls rapidly. The dependence of tanδ with frequency for PPTMP thin films of different thicknesses showed small relaxation peak at the very low frequencies (<102Hz) and then it decreases slightly with a broad minimum at 103 Hz and again increases. Cole–Cole plot reveals that Debye type of mechanism is operative in the experimental frequency range. POLYM. ENG. SCI., 58:1342–1345, 2018. © 2017 Society of Plastics Engineers

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Structural analysis and dielectric property of novel conjugated polycyanurates

Cited by 8 publications

References 32 publications

High-temperature resistance and wave-transmitting quartz-fibre/polyimide composite

High-temperature resistance and wave-transmitting quartz-fibre/polyimide composite

Preparation and properties of 4,4′‐(hexafluoroisopropylidene) diphenol cured 2,2‐bis(4‐cyanatophenyl) propane

Thickness dependence of ac electrical conductivity and dielectric behavior of plasma polymerized 1, 1, 3, 3–tetramethoxypropane thin films

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