Temperature dependence of surface DC electrical conductivity of carbon-implanted polymers modified by gamma irradiation

Velitchkova, K.; Krezhov, K.; Балабанов, С. С.

doi:10.1016/s0042-207x(00)00216-5

Cited by 23 publications

(11 citation statements)

References 5 publications

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“…This can be attributed to the formation of some defects sites in the band gaps of polymer because of occurrence of chain scission. Generally, these defects may indicate sign of the existence of charge carriers traps in the band gap of the polymer (Velitchkova et al 2000;El-Sayed et al 2004). Therefore, the irradiation increases the ability of the polymer to store charge, i.e., the increase of its dielectric constant (Abdul-Kader et al 2014).…”

Section: Electrical Propertiesmentioning

confidence: 99%

Electrical and optical properties of Makrofol DE 1-1 polymeric films induced by gamma irradiation

2019

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Background: A set of Makrofol DE 1-1 polymeric samples was irradiated to different gamma doses. The dielectric response of irradiated polymers was investigated at a wide range of frequencies at room temperature. The modification induced in optical properties include the optical band gap (E optical ), number of carbon per cluster (M), number of carbon per length (N), and refractive index (n) for irradiated samples were studied as well. Methods: The dielectric constant (έ), dielectric loss factor (ε˝), loss tangent (tanδ), the ac electrical conductivity (σ ac ), and impedance (Z) were measured in the frequency range from (100) Hz to (100) MHz. The optical band gap energy and its corresponding parameters for the samples were evaluated using ineffective thickness method (ITM). Results: Gamma-ray irradiation had a considerable effect on the optical band gap energy for Makrofol DE 1-1 polymer detector film, which decreases from 4.20 to 3.96 eV and 4.35 to 4.16 eV for indirect and direct allowed transitions in ITM method, respectively, while it decreases from 4.40 to 4.20 eV in DITM method as a result of γ-ray dose increases. (n) of all studied samples is considerably high. (N) and (M) for the direct transition are lower than that for the indirect transition and their values increase with increasing gamma dose. Conclusion: The results reveal that Makrofol DE1-1 polymer can be used as gamma dosimeter. Furthermore, Makrofol DE1-1 has much greater resistance to radiation damage; the attained results suggested strongly the applicability of Makrofol DE1-1 polymer to be used in medical products applications and suitable for optoelectronic and photoelectric devices.

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Section: Electrical Propertiesmentioning

confidence: 99%

Electrical and optical properties of Makrofol DE 1-1 polymeric films induced by gamma irradiation

2019

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“…The increase in ε′ values may be attributed to the formation of defected states in the band gap of the polymer. These states result from the chain scissions occurring in both NBR and SBR as a result of irradiation 52,53. Generally, these defects may result in the existence of traps of the charge carriers in the band gap of the polymer that can capture the charge carriers 54,55.…”

Section: Resultsmentioning

confidence: 99%

“…These states result from the chain scissions occurring in both NBR and SBR as a result of irradiation. 52,53 Generally, these defects may result in the existence of traps of the charge carriers in the band gap of the polymer that can capture the charge carriers. 54,55 Therefore, the irradiation increases the ability of the polymer to store charge, i.e., the increase in its dielectric constant.…”

Section: Electrical Measurementsmentioning

confidence: 99%

Electrical Properties of Irradiated Rubber‐Clay Composites Based on NBR and SBR

2012

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ABSTRACT:The electrical and thermal properties of gamma-irradiated rubber-clay composites based on acrylonitrile-butadiene rubber (NBR) and styrene-butadiene rubber (SBR) have been performed. The rubber-clay composites were prepared with different ratios of clay up to 50 phr using melt-mixing and hot-pressing methods. The produced sheets were exposed to gamma rays at dose levels in the range from 25 to 250 kGy. The chemical structure was studied by using FTIR technique, whereas thermal stability was tested using thermogravimetric analysis. Variations in the direct current (DC) conductivity (σ DC ) with both the clay ratio and irradiation dose were studied. The effect of the clay ratio and gamma irradiation on the dielectric constant (ε ) and loss (ε ) has also been investigated. The obtained results show that the thermal stability has been improved as a result of clay loading and gamma irradiation of the rubber samples. Moreover, a significant increase in the values of ε and ε with increasingCorrespondence to: Rasha M. Mohamed;

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“…The specific conductivity σ was measured by means of a device measuring very high resistance. The procedure was set different values of current for measuring the voltage and calculating the resistance (R) [10]. Equation (3) is used to calculate the conductivity where A is the area of discs samples and L is length of disk.…”

Section: Electrical Conductivity Measurementmentioning

confidence: 99%

“…The carbon black dispersion is strongly dependent on carbon black content and therefore a percolation threshold value for the composite should be investigated. Carbon black used as fillers in many polymers such as ultra-high molecular weight polyethylene (UHMWPE) [10,11], high density polyethylene (HDPE) [12,13], ethylene butylacrylate copolymer (EBA) [14], ethylene-octene elastomer (EO) [15], low molecular weight polyethylene (LMWPE) [16], Low-density polyethylene (LDPE) [17] and Polypropylene (PP) [17]. The fillers were around of 0.5wt% to 5wt%.…”

Section: Introductionmentioning

confidence: 99%

Effect Of Carbon Black Loading On Linear Low-Density Polyethylene Properties

Al‐Qahtani

Al‐Ejji

Ouederni³

et al. 2021

Preprint

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The mechanical, thermal, electrical, reheology, and morphological properties of composites made from linear low-density polyethylene and carbon black (CB) content of 5%, 10%, and 20% by weight were investigated. The optimum mechanical and electrical properties performance was achieved with the adding of 5% carbon black. The drop in properties after adding more CB is due to agglomeration and poor dispersion of carbon particles in the polymer matrix. CB resulted in higher dynamic viscosity and storage modulus at low frequencies, although this phenomenon was reversed at high frequencies. CB resulted in more shear thinning of LLDPE at high shear rates.

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Temperature dependence of surface DC electrical conductivity of carbon-implanted polymers modified by gamma irradiation

Cited by 23 publications

References 5 publications

Electrical and optical properties of Makrofol DE 1-1 polymeric films induced by gamma irradiation

Electrical and optical properties of Makrofol DE 1-1 polymeric films induced by gamma irradiation

Electrical Properties of Irradiated Rubber‐Clay Composites Based on NBR and SBR

Effect Of Carbon Black Loading On Linear Low-Density Polyethylene Properties

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