Electrical and mechanical properties of polyethylene-rubber blends

Mohamed, Manal G.; Abd‐El‐Messieh, S. L.; El‐Sabbagh, Salwa H.; Younan, A. F.

doi:10.1002/(sici)1097-4628(19980725)69:4<775::aid-app16>3.0.co;2-o

Cited by 45 publications

(24 citation statements)

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“…NBR is characterized by good mechanical properties and moderate insulating properties because it possesses high values of ϵ′ (17–14)29 and very high ϵ″ values (1.33–2.00) that, to some extent, lessen its insulating properties. For this reason, we loaded it with untreated and treated newsprint fiber waste and silica in the same manner mentioned previously for NR with the aim of reducing ϵ″ and keeping the changes in both ϵ′ and the mechanical properties to a minimum.…”

Section: Resultsmentioning

confidence: 99%

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Newsprint paper waste as a fiber reinforcement in rubber composites

El‐Nashar¹,

Abd‐El‐Messieh

Basta

2003

J of Applied Polymer Sci

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ABSTRACT:The investigation of the economical use of lignocellulose waste, which is one of the environmental problems facing third-world nations, is ongoing. In this study, we intended to increase the use of newsprint fibers in the rubber industry. For this reason, we treated newsprint fibers with sodium silicate and magnesium chloride, and we examined the water retention values and thermal degradation analyses of the treated fiber waste. The activation energy of degradation was evaluated with the Coats-Redfern method of analysis. The effects of the addition of different amounts [0 -60 parts per hundred parts of rubber by weight (phr)] of untreated and treated newsprint fibers on both the electrical and mechanical properties of two different types of rubber (natural rubber and acrylonitrile rubber) were studied. This study led us to the conclusion that the addition of treated newsprint fiber waste at a concentration of 40 phr could lead to an end product characterized by good electrical and mechanical properties.

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Section: Resultsmentioning

confidence: 99%

“…Butadiene acrylate copolymer (NBR) is characterized by good mechanical properties and good oil resistance,28 but it has moderate insulating properties despite the high value of its permittivity (ϵ′ = 17–14) 29. The considerably high dielectric loss (ϵ″ = 1.33–2.00) to some extent deprives NBR of its insulating properties.…”

Section: Introductionmentioning

confidence: 99%

Newsprint paper waste as a fiber reinforcement in rubber composites

El‐Nashar¹,

Abd‐El‐Messieh

Basta

2003

J of Applied Polymer Sci

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“…One of the most important and widely used synthetic rubbers is styrene–butadiene rubber (SBR), a copolymer of styrene and butadiene. For such importance, this research work was directed to carry out some improvements on SBR to be used in industrial applications such as tires and related products, wires, and cables 1–3…”

Section: Introductionmentioning

confidence: 99%

Tuning Excited State Isomerization Dynamics through Ground State Structural Changes in Analogous Ruthenium and Osmium Sulfoxide Complexes

Garg

Engle

Ziegler

et al. 2013

Chemistry A European J

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The complexes [Ru(bpy)2(pyESO)](PF6)2 and [Os(bpy)2(pyESO)](PF6)2, in which bpy is 2,2'-bipyridine and pyESO is 2-((isopropylsulfinyl)ethyl)pyridine, were prepared and studied by (1)H NMR, UV-visible and ultrafast transient absorption spectroscopy, as well as by electrochemical methods. Crystals suitable for X-ray structural analysis were grown for [Ru(bpy)2(pyESO)](PF6)2. Cyclic voltammograms of both complexes provide evidence for S→O and O→S isomerization as these voltammograms are described by an ECEC (electrochemical-chemical electrochemical-chemical) mechanism in which isomerization follows Ru(2+) oxidation and Ru(3+) reduction. The S- and O-bonded Ru(3+/2+) couples appear at 1.30 and 0.76 V versus Ag/AgCl in propylene carbonate. For [Os(bpy)2(pyESO)](PF6)2, these couples appear at 0.97 and 0.32 V versus Ag/AgCl in acetonitrile, respectively. Charge-transfer excitation of [Ru(bpy)2(pyESO)](PF6)2 results in a significant change in the absorption spectrum. The S-bonded isomer of [Ru(bpy)2(pyESO)](2+) features a lowest energy absorption maximum at 390 nm and the O-bonded isomer absorbs at 480 nm. The quantum yield of isomerization in [Ru(bpy)2(pyESO)](2+) was found to be 0.58 in propylene carbonate and 0.86 in dichloroethane solution. Femtosecond transient absorption spectroscopic measurements were collected for both complexes, revealing time constants of isomerizations of 81 ps (propylene carbonate) and 47 ps (dichloroethane) in [Ru(bpy)2(pyESO)](2+). These data and a model for the isomerizing complex are presented. A striking conclusion from this analysis is that expansion of the chelate ring by a single methylene leads to an increase in the isomerization time constant by nearly two orders of magnitude.

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“…This was due to the fact that the mobility of charged groups was easier in the blended materials because of the impurities included during sample fabrication which worked as conductive particles. The comparison between the HDPE/PP blends and the LDPE/PP blends indicated that the HDPE/PP blends had higher permittivity influenced by the degree of crystallinity of HDPE, which was higher than that of LDPE [36]. materials.…”

Section: Dielectric Properties Resultsmentioning

confidence: 94%

Electrical Properties of Polyethylene/Polypropylene Compounds for High-Voltage Insulation

et al. 2018

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Abstract:In high-voltage insulation systems, the most commonly used material is polymeric material because of its high dielectric strength, high resistivity, and low dielectric loss in addition to good chemical and mechanical properties. In this work, various polymer compounds were prepared, consisting of low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), HDPE/PP, and LDPE/PP polymer blends. The relative permittivity and breakdown strength of each sample types were evaluated. In order to determine the physical properties of the prepared samples, the samples were also characterized using differential scanning calorimetry (DSC). The results showed that the dielectric constant of PP increased with the increase of HDPE and LDPE content. The breakdown measurement data for all samples were analyzed using the cumulative probability plot of Weibull distribution. From the acquired results, it was found that the dielectric strengths of LDPE and HDPE were higher than that of PP. Consequently, the addition of LDPE and HDPE to PP increased the breakdown strength of PP, but a variation in the weight ratio (30%, 50% and 70%) did not change significantly the breakdown strength. The DSC measurements showed two exothermic crystallization peaks representing two crystalline phases. In addition, the DSC results showed that the blended samples were physically bonded, and no co-crystallization occurred in the produced blends.

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Electrical and mechanical properties of polyethylene-rubber blends

Cited by 45 publications

References 1 publication

Newsprint paper waste as a fiber reinforcement in rubber composites

Newsprint paper waste as a fiber reinforcement in rubber composites

Tuning Excited State Isomerization Dynamics through Ground State Structural Changes in Analogous Ruthenium and Osmium Sulfoxide Complexes

Electrical Properties of Polyethylene/Polypropylene Compounds for High-Voltage Insulation

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