Abstract
Temperature-modulated differential scanning calorimetry has been employed to analyze the structure-related thermal properties of petroleum bitumen. This method enables one to distinguish between “order–disorder” and glass transitions, thereby making it possible to monitor and identify structure-related phase transformations, the signals from which are invisible or overlapped in the thermograms of conventional differential scanning calorimetry. Bitumen has been shown to be a colloidal disperse system only under certain temperature–time conditions. Its dispersed phase may be represented by aggregates of two types with colloidal sizes. Saturated hydrocarbons form a solid crystalline phase in accordance with the regularities of first-order structural phase transitions and nucleation mechanism of phase separation. Asphaltenes and resins form a solid amorphous phase for a relatively long time as a result of a structural relaxation glass transition by the spinodal mechanism of phase separation.
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Original Russian Text © I.N. Frolov, T.N. Yusupova, M.A. Ziganshin, E.S. Okhotnikova, A.A. Firsin, 2016, published in Kolloidnyi Zhurnal, 2016, Vol. 78, No. 5, pp. 650–654.
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Frolov, I.N., Yusupova, T.N., Ziganshin, M.A. et al. Features of colloidal disperse structure formation in petroleum bitumen. Colloid J 78, 712–716 (2016). https://doi.org/10.1134/S1061933X16050069
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DOI: https://doi.org/10.1134/S1061933X16050069