Sound velocity and thermodynamic parameters of chloro epoxy resins of bisphenol-C solutions in chlorinated and aprotic solvents at 35°C and 40°C

Kagathara, V.M; Parsania, P. H.

doi:10.1016/s0014-3057(00)00256-1

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…Furthermore, the discharge time τ 1/2 decreases with the increase of CBA content and by more than 10 s, so that time dependence on the surface potential could be registered. This indicates that the epoxy–CBA composites with high CBA content cannot remove charge from the sample immediately and are considered as composites with poor antistatic properties but useful for electromagnetic wave shielding applications,26–30. These results are consistent with those of the static energy work discussed above.…”

Section: Resultssupporting

confidence: 81%

On the ‘curiosity’ of electrical self‐heating, static charge and electromagnetic shielding effectiveness from carbon black/aluminium flakes reinforced epoxy‐resin composites

El-Tantawy¹,

Kamada²,

Ohnabe³

2002

Polymer International

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This paper shows the wide application range (such as electrical self‐heating and electromagnetic shielding effectiveness) of composites consisting of conductive carbon black/aluminum flakes (CBA) filler and epoxy insulative matrix. The effect of CBA content on the network structure of epoxy matrix was investigated in detail. Static electrical conductivity increases linearly with the increase of filler concentration at the interface in epoxy composites. The large decrease of the conductivity as a function of the temperature is analyzed in terms of the negative temperature coefficient of conductivity (NTCC) effect. The influence of viscosity, surface energy and barrier highest energy on the NTCC behaviour in the composite is also considered. Based on these results, a new interpretation is proposed to explain the NTCC phenomena by computing the swelling force among conductive phases. The correlations of conductivity during the temperature cycling and activation energy were analyzed. The effects of dynamic ageing at various temperatures on the resistivity are reported. Current–voltage–temperature characteristics for epoxy with different contents of CBA were examined in detail. A model based on the law of energy conservation is proposed to calculate the specific heat and amount of heat dissipation. The static charge of the epoxy–CBA composites was estimated. The correlation between electromagnetic wave‐shielding effectiveness (EMS), conductivity and frequency of epoxy composites with different filler contents is also discussed. Furthermore, the effect of annealing on EMS of epoxy composites was examined. © 2002 Society of Chemical Industry

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Section: Resultssupporting

confidence: 81%

On the ‘curiosity’ of electrical self‐heating, static charge and electromagnetic shielding effectiveness from carbon black/aluminium flakes reinforced epoxy‐resin composites

El-Tantawy¹,

Kamada²,

Ohnabe³

2002

Polymer International

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“…There were also attempts to use the Pasynski method to determine the solvation numbers of nonelectrolytic substances in nonaqueous systems, such as polymers in different solvents, ,,− acetic acid in methanol, alcohols in olive oil or in propan-1-ol and n-heptane, , and soybean oil in different organic solvents …”

Section: Acoustic Methods For Determination Of Hydration Numbers Of N...mentioning

confidence: 99%

Hydration Numbers of Nonelectrolytes from Acoustic Methods

Burakowski

Gliński

2011

Chem. Rev.

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Prediction of pressure–viscosity coefficient of lubricating oils based on sound velocity

Mia

Ohno

2009

Lubrication Science

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The pressure-viscosity coeffi cient is an important parameter in tribology. Experimentally, it is calculated using the high-pressure viscosity measurement. Also, the adiabatic bulk modulus is calculated using the sound velocity in the lubricating oil. Several lubricating oils are considered on the group basis such as traction oil, mineral oil, polyalphaolefi n oil, perfl uoropolyether oil and glycerol, depending on their molecular structure. Experimental pressure-viscosity coeffi cient is compared with the adiabatic bulk modulus. It is found that the pressure-viscosity coeffi cient increases exponentially with the adiabatic bulk modulus, and the relationship depends on the molecular structure of the lubricating oils. This study proposes two equations to predict the pressure-viscosity coeffi cient from the adiabatic bulk modulus based on sound velocity, one for the traction oil, and another for the paraffi nic mineral oil and the polyalphaolefi n oil.

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Sound velocity and thermodynamic parameters of chloro epoxy resins of bisphenol-C solutions in chlorinated and aprotic solvents at 35°C and 40°C

Cited by 4 publications

References 10 publications

On the ‘curiosity’ of electrical self‐heating, static charge and electromagnetic shielding effectiveness from carbon black/aluminium flakes reinforced epoxy‐resin composites

On the ‘curiosity’ of electrical self‐heating, static charge and electromagnetic shielding effectiveness from carbon black/aluminium flakes reinforced epoxy‐resin composites

Hydration Numbers of Nonelectrolytes from Acoustic Methods

Prediction of pressure–viscosity coefficient of lubricating oils based on sound velocity

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