High-Temperature Compensation Effect of Dynamic Viscosity in Multicomponent Hydrocarbon Media

Dolomatov, M. Yu.; Низамова, Г. И.; Zhuravleva, N. A.

doi:10.1007/s10891-017-1652-4

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…It is known that the H  VF is associated with the size of the molecule or its fragment involved in the momentum transfer in viscous flow. 24 Therefore, the activation enthalpy of DOP is slightly higher than that of DBP. Thus, a low Oxal value indicates a weaker effect of temperature on viscosity (Fig.…”

Section: Resultsmentioning

confidence: 96%

Flotator Oxal as the plasticizer for suspension PVC

Trifonova

Rodicheva

Sheveleva

et al. 2022

JSCS

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The flotator Oxal, mixture of dioxane ethers and alcohols as well as 1, 2 and 3 atomic alcohols, has been studied as a plasticizer for suspension PVC in comparison with the well-known dibutyl phthalate (DBP) and di-(2-ethylhexyl) phthalate (DOP). The rheological parameters and gelation ability of plasticizers were determined, the values of the storage modulus and tangent of mechanical loss angle in the glassy and rubbery states were measured by the DMA method, and the glass transition temperatures were determined. The deformation-strength properties and rigidity of polymer films were tested before and after light-thermal aging. Oxal was shown to reveal a fairly low viscosity and high gelation properties in relation to PVC. At the same time, its ability to reduce the glass transition temperature and elasticize the polymer in the glassy and rubbery state is somewhat lower than that of phthalate plasticizers. PVC samples plasticized with DBP have the highest resistance to light-thermal aging.

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Section: Resultsmentioning

confidence: 96%

Flotator Oxal as the plasticizer for suspension PVC

Trifonova

Rodicheva

Sheveleva

et al. 2022

JSCS

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Multiple Regression Model for Determining and Predicting the Viscosity of Crude Oils Mixture

Baykova

Гаррис

Karimova

2019

IOP Conf. Ser.: Earth Environ. Sci.

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The article presents development stages of a reliable multiple regression model for determining and predicting the oils mixture viscosity as a multifactor parameter. On the data of the laboratory experiment, a correlation and regression analysis was performed to select significant factors in the model. A fractional factorial experiment was carried out. A matrix of regression coefficients and a multiple linear regression equation were obtained. Estimation of the model significance has shown that the equation obtained describes empirical data with a high degree of reliability. The conducted studies showed that the known dependencies adequately describe the viscosity of crude oils mixture only when the content of a high-sulfur component is less than 10% or more than 90%. On a wider range of concentrations (20-80%), the viscosity of the mixture becomes a multifactor parameter and is more accurately described by the regression equation. The obtained dependence has a wide field of application in the practice of operating pipelines transporting compounded oil.

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Investigation of the physicochemical properties of aqueous solutions of sodium salt of carboxymethyl starch obtained in the solid phase by viscometric methods

Saparov,

Makhkamov

2023

Preprint

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By chemical modification of corn starch with sodium monochloroacetate in the solid phase, samples of sodium salt of carboxymethyl starch (Na-CMS) with different degrees of substitution (DS) were synthesized. In the synthesis of Na-CMS, solvents such as water, methanol, ethanol, butanol, and isopropyl alcohol were used as humectants in the reaction mixture. The viscosity of dilute aqueous solutions of Na-CMS was studied by capillary viscometry. It is shown that dilute solutions of Na-CMS exhibit properties characteristic of polyelectrolytes. The rheological properties of aqueous solutions of the synthesized Na-CMS samples were studied by the method of rotational viscometry. By changing the shear rate gradient over a wide range, the values of the shear stress and the effective viscosity of the solutions at different temperatures were determined. At the same time, the obtained data showed that aqueous solutions of Na-CMS belong to non-Newtonian liquids in the entire studied temperature range. It was also found that the dynamic viscosity of Na-CMS solutions decreases with an increase in their DS. The activation energy of the viscous flow of Na-CMS solutions was determined, the value of which shows that the polymer macromolecules interact with each other through hydrogen bonds.

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High-Temperature Compensation Effect of Dynamic Viscosity in Multicomponent Hydrocarbon Media

Cited by 3 publications

References 2 publications

Flotator Oxal as the plasticizer for suspension PVC

Flotator Oxal as the plasticizer for suspension PVC

Multiple Regression Model for Determining and Predicting the Viscosity of Crude Oils Mixture

Investigation of the physicochemical properties of aqueous solutions of sodium salt of carboxymethyl starch obtained in the solid phase by viscometric methods

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