Mechanism of Multi-Stage Degradation in Hot Bitumen of Micronized Powder Elastomeric Modifiers from Worn-Out Tire's Rubber.

For the first time, by atomic force microscopy (AFM) methods, micro- and nanofragments of micronized powder elastomeric modifier (PEM) formed at the short-term (3 min at 160 °C) interaction of PEM with hot bitumen have been demonstrated. It is the technology of high-temperature shear-induced grinding of a worn-out tire's crumb rubber or its co-grinding with styrene-butadiene-styrene (SBS) block copolymer which provides the creation of the PEM structure inclined to rapid degradation in hot bitumen. The formation just after the preparation process of a new structure of a modified binder, more resistant to external effects, is supported by the data of rheological tests.

Ultra-Dispersed Powders Produced by High-Temperature Shear-Induced Grinding of Worn-Out Tire and Products of Their Interaction with Hot Bitumen.

Structural features of crumb rubber (CR) particles obtained by grinding on rollers and ultra-disperse powder elastomeric modifiers (PEM) obtained by high-temperature shear-induced grinding (HTSG) of CR or co-grinding with butadiene styrene thermoplastic elastomer (SBS) have been studied by electron and optical microscopy methods. Samples of modified bitumen were obtained at different mixing times (1-40 min) in a wide temperature range (120-180 °C). The products of interaction of PEM with hot bitumen precipitated on filters when washed with solvent from modified bitumen (MB) were studied by scanning electron microscopy (SEM).

[EFFECT OF ANTIOXIDANTS ON ESOPHAGUS TISSUE REPAIR UPON EXPERIMENTAL CHEMICAL BURN FROM ACETIC ACID].

This work is an experimental study on 30 rabbits to determine the effect of antioxidants on the process of repair of the esophagus. Chemical agent was 46% acetic acid, a The antioxidant "Mexidol" were injected to core group of test animals in 2 weeks. Animals were taken from the experiment at 5, 14, 21, 30, 45 and 60 hours.

[Application of hyperosmotic iso-oncotic solutions for prolonged veno-venous haemofiltration in patients with gramm negative sepsis].

Dynamics of circulation and elimination of low and medium molecular weight substances and lipopolysaccharides of Gramm negative bacteria were studied during prolonged veno-venous haemofiltration in patients with Gramm negative sepsis. Positive effect of HyperHAES solution for endotoxicosis compensation has been defined in the study. HyperHAES can be used repeatedly during prolonged veno-venous haemofiltration.