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Study of the open porosity of carbon materials using thermoporometry
https://doi.org/10.26896/1028-6861-2020-86-11-28-35
Abstract
Thermoporometry is a calorimetric method for characterizing pore structure from the melting or freezing point depression of a liquid confined in a pore, by the reason of the added contribution of surface curvature to the phase-transition free energy. Porous materials are widely used in the production of noise and vibration-absorbing coatings, thermal insulation, filters, etc. We present the results of studying the porous structure using thermoporometry, a method based on lowering the melting point of the working substance (penetrant) which previously filled micro- and mesopores of the sample under study. The open porosity of carbon materials based on phenol-formaldehyde resins and a pore former obtained after pyrolysis under different conditions of microphase separation induced by polymerization is analyzed. The tests were carried out using a differential scanning calorimeter. Bidistilled water, which has a relatively high value of the enthalpy change upon melting of the crystalline phase is used as a penetrant to lower the error of measurements. Differential and integral curves of the size distribution of micro- and mesopores are presented. It is shown that an increase in the microphase separation temperature entails an increase in the total porosity. Moreover, an increase in the polymerization rate of phenol-formaldehyde resin due to resin modification with m-cresol also facilitated an increase in the cumulative volume of micro- and mesopores. It is shown that replacement of phenol with paracresol leads to an increase in the total porosity even under a significant decrease in resole resin polycondensation rate. The results obtained can be used in the development of carbon matrices with controlled parameters of the mass transfer.
About the Author
M. A. Khaskov
All-Russian scientific research institute of aviation materials
Russian Federation
Russian Federation
Maxim A. Khaskov
17, ul. Radio, Moscow, 105005
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Review
For citations:
Khaskov M.A. Study of the open porosity of carbon materials using thermoporometry. Industrial laboratory. Diagnostics of materials. 2020;86(11):28-35. (In Russ.) https://doi.org/10.26896/1028-6861-2020-86-11-28-35
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