Modification of Powder Fillers in Order to Improve Operating Properties of Composite Polymer-Based Materials

The effect of moisture adsorption in the characterization of dielectric powders by an indirectly coupled open-ended coaxial cavity method operating at 4.5 GHz was analyzed. SiO2, Al2O3, and ZrO2 powders were exposed to 5% and 100% relative humidity levels and Bruggeman symmetric, Looyenga, and General Mixing Model equations were used to determine changes in permittivity and loss tangent of the inclusions. Low moisture adsorption (0.1–2.5 vol. %) induced only a small change in inclusion permittivity but had a pronounced impact on dielectric losses. Calculated moisture percentages based on responses of the resonator and the General Mixing Model correlated well with traditional mass based determination. The presented characterization method exhibited high sensitivity for the determination of dielectric properties of powders and their moisture content to be further utilized in, e.g., process and quality monitoring.

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Investigation of the Parameters of Adsorption of Ethylhydrosiloxane on the Surface of Tungsten Carbide

Павленко

Kashibadze

Romanyuk

et al. 2022

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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The article deals with the modification of the surface of tungsten carbide powder with ethylhydrosiloxane. The morphology and granulometric composition of the original tungsten carbide have been studied. To modify the powder, the oligomer is preliminarily dissolved in n-hexane. It is found that the adsorption equilibrium is established in the first hour. Based on the data obtained, an adsorption isotherm of oligomeric ethylhydrosiloxane molecules on tungsten carbide particles is plotted as a function of the equilibrium concentration. It has been established that the adsorption isotherm of oligomeric ethylhydrosiloxane molecules on tungsten carbide particles has a typical character of monomolecular (monolayer) adsorption. At an equilibrium concentration of 0.12 mg/cm3, the adsorption isotherm curve reaches a plateau. Data on the determination of the parameters of adsorption of oligomeric molecules of ethylhydrosiloxane on the surface of tungsten carbide are presented: the landing area occupied by one oligomer molecule and the thickness of the adsorption layer of the oligomer. It is shown that modification with ethylhydrosiloxane leads to a transition from a hydrophilic to a hydrophobic surface. To establish the hydrophobization of the surface of tungsten carbide after modification with ethylhydrosiloxane, authors determine the contact angles of surface wetting before and after modification. At oligomer concentrations above 0.12 mg/cm3, the contact angle of wetting the surface of tungsten carbide with water has a maximum value of 96±2°.

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Modification of Powder Fillers in Order to Improve Operating Properties of Composite Polymer-Based Materials

Cited by 3 publications

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Determination of complex permittivity of surfactant treated powders using an open-ended coaxial cavity resonator

Determination of complex permittivity of surfactant treated powders using an open-ended coaxial cavity resonator

Use of an open-ended coaxial cavity method to characterize powdery substances exposed to humidity

Investigation of the Parameters of Adsorption of Ethylhydrosiloxane on the Surface of Tungsten Carbide

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