Spectroscopic study of solid state photoreaction of di <i>n</i>‐propyl ester of dicyano <i>p</i>‐phenylenediacrylic acid

Ghosh, Manas; Chakrabarti, Supriya; Sarkar, Mamata; Misra, T. N.

doi:10.1002/pola.1994.080320501

Cited by 36 publications

(53 citation statements)

References 7 publications

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“…The dispersion of filler is heterogeneous, localized and disordered. This disorder results in a wide distribution of hopping rates, giving a strong dispersion of the ac conductivity 34, 35. At low frequencies, a frequency independent conductivity is recorded, which is attributed to resistive conduction through the bulk composite.…”

Section: Resultsmentioning

confidence: 99%

Dielectric dispersion and AC conductivity of acrylonitrile butadiene rubber‐poly(vinyl chloride)/graphite composite

Mansour

Al-Ghoury

Shalaan

et al. 2011

J of Applied Polymer Sci

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Dielectric properties and ac electrical conductivity of Acrylonitrile Butadiene Rubber-poly(vinyl chloride)/Graphite Composite were studied at different frequencies (10 2 À10 6 Hz) in the temperature range (298-423 K). The results show that the dielectric constant (e 0 ), dielectric loss (e 00 ), ac electrical conductivity (r ac ) and, the electric modulus are strongly dependent on the frequency and temperature. The dielectric constant e 0 increases with temperature and decreases with frequency, whereas the dielectric loss e 00 displays a broad maximum peak whose position shifts with temperature to a higher frequency region. Cole-Cole diagrams have been used to investigate the frequency dependence of the complex impedance at different temperature and graphite loading. Interfacial or Maxwell-Wagner-Sillars relaxation process was revealed in the frequency range and temperature interval of the measurements, which was found to follow the Havriliak-Negami approach for the distribution of relaxation times. At constant temperature, the frequency dependence of ac conductivity was found to fit with the established equation r ac (x) ¼ Ax s quite well. The values of S for the investigated samples lie between 0.88 and 0.11. The conduction mechanism of ac conduction was discussed by comparing the behavior of the frequency exponent S(T) with different theoretical models. It was found that the correlated barrier hopping (C.B.H.) is the dominant conduction mechanism.

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Section: Resultsmentioning

confidence: 99%

Dielectric dispersion and AC conductivity of acrylonitrile butadiene rubber‐poly(vinyl chloride)/graphite composite

Mansour

Al-Ghoury

Shalaan

et al. 2011

J of Applied Polymer Sci

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“…The conductivity of a composite depends on the temperature of service environment. In general, the electrical resistivity of conductive polymer composites exhibit two types of behavior with respect to temperature; either resistivity increases with the increase in temperature known as positive temperature coefficient (PTC) of resistivity or resistivity decreases with the increase in temperature called the negative temperature coefficient (NTC) of resistivity . These PTC and NTC of resistivity depend on concentration and type of conductive fillers, and the nature of matrix polymer used in the composite.…”

Section: Introductionmentioning

confidence: 99%

Polyimide‐carbon nanotubes nanocomposites: electrical conduction behavior under cryogenic condition

Nayak

Rahaman

Aldalbahi

et al. 2016

Polymer Engineering & Sci

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This study is aimed to investigate the electrical conduction behavior of polyimide (PI)/multiwall carbon nanotubes (CNTs) nanocomposites in cryogenic environment (temperature from 10 to 300 K) prepared by in situ polymerization technique. The experimental results of direct current (DC) electrical conductivity have been fitted with different theoretical models to check their applicability and to understand the conduction behavior for the present nanocomposite system. The PI/CNT nanocomposites show low electrical percolation threshold. Negative temperature coefficient effect of resistivity is observed for all the composites under investigation. The analysis shows that Mott's variable range hopping (VRH) model is more applicable compared to Arrhenius and Kivelson models for the present composites over the entire range of measurement temperature. The electronic transport behavior in each composite at temperature above 70 K can be ascribed to thermally activated tunneling of charge carriers through insulating barriers between CNTs; however, the electronic transport behavior at temperature below 70 K can be attributed to three dimensional VRH of charge carriers through the networks of CNTs in the polymer composite. The current–voltage characteristics of the composite show non‐ohmic behavior for temperature below 60 K and become ohmic in nature as temperature rises to 300 K. POLYM. ENG. SCI., 57:291–298, 2017. © 2016 Society of Plastics Engineers

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“…Therefore, MXene‐based composite was very thin and exert excellent EMI shielding similar to metallic shielding materials (Figure (d)). In addition, fabricated composite fabric gave rise to good shielding compared with graphene, multiwall carbon nanotube, and other carbon base composites . Hence, nonwoven carbon fabric was an excellent choice over cellulose nanofiber/MXene composite (Cao et al .…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Nonwetting Flexible Free‐Standing MXene‐Carbon Fabric for Electromagnetic Shielding in S‐Band Region

Raagulan

Braveenth

Jang

et al. 2018

Bulletin Korean Chem Soc

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MXene and nonwoven carbon fabric are good candidate for flexible, light‐weight electromagnetic interference (EMI) shielding fabric. The prepared composite was characterized using X‐ray diffraction, X‐ray photo electron spectroscopy, energy‐dispersive X‐ray spectroscopy, scanning electron microscope, mapping, and Raman spectroscopy. The 15 times coated composite displayed a contact angle of 123°, a wetting energy of −39.86 mN/m, a spreading coefficient of −112.66 mN/m, and 32.94 mN/m work of adhesion. The fabricated composites inhibited thermal degradation until 235 °C. The composite revealed an excellent electric conductivity of 8.5 S/cm with a sheet resistance of 6.5 Ω/sq. The composite showed a maximum EMI shielding of 43.2 dB at 2.3 GHz with 8534.7 dB cm2/g. The composite displays better outlook application areas such as aviation, portable electronics, radars, aerospace, and military.

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Spectroscopic study of solid state photoreaction of di n‐propyl ester of dicyano p‐phenylenediacrylic acid

Cited by 36 publications

References 7 publications

Dielectric dispersion and AC conductivity of acrylonitrile butadiene rubber‐poly(vinyl chloride)/graphite composite

Dielectric dispersion and AC conductivity of acrylonitrile butadiene rubber‐poly(vinyl chloride)/graphite composite

Polyimide‐carbon nanotubes nanocomposites: electrical conduction behavior under cryogenic condition

Fabrication of Nonwetting Flexible Free‐Standing MXene‐Carbon Fabric for Electromagnetic Shielding in S‐Band Region

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