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- Title
Features of colloidal disperse structure formation in petroleum bitumen.
- Authors
Frolov, I.; Yusupova, T.; Ziganshin, M.; Okhotnikova, E.; Firsin, A.
- 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.
- Subjects
COLLOIDS; BITUMEN; NONMETALLIC minerals; CALORIMETRY; TEMPERATURE measurements
- Publication
Colloid Journal, 2016, Vol 78, Issue 5, p712
- ISSN
1061-933X
- Publication type
Article
- DOI
10.1134/S1061933X16050069