Features of colloidal disperse structure formation in petroleum bitumen

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.     

Thermal analysis methods to study the reservoir bitumens

Journal of Thermal Analysis and Calorimetry - The bitumen-containing reservoir rocks taken from Devonian terrigenous formation of Romashkino and Bavly oil fields (Russia) were sampled and...     

Thermal and structural characterization of bitumen by modulated differential scanning calorimetry

Journal of Thermal Analysis and Calorimetry - This paper presents the results of investigation of model bitumens, prepared by mixing of individual fractions of bitumen (saturates, aromatics, waxes,...     

Compatibility of olefinic thermoelastoplastics with oxidized bitumens of various colloidal structures

The compatibility of oxidized bitumens of types I and III with blended olefinic thermoelastoplastics was studied by calorimetry, viscometry, and atomic-force microscopy. Improvement of process characteristics of modified products based on bitumens is asssociated with different mechanisms of formation of their structure.     

Optimization of the composition of bitumen-polymer compounds based on bitumens with various disperse structures

Optimal concentrations of the mixed polyolefin modifier of TPM grade, necessary for introduction into bitumens with various disperse structures for obtaining bitumen-polymer compounds meeting the GOST (State Standard) requirements to roofing materials, were determined. The role of the crystalline phase of the polyolefin in determination of the quality of bitumen-polymer compounds was examined.     

Assessing the structure of recycled polyethylene-modified bitumen using the calorimetry method

Journal of Thermal Analysis and Calorimetry - The thermo-physical properties enhancement of nanolubricants can improve the heat transfer performance in refrigeration system. In this study,...