dynamic viscosity

The influence of chemical nature of modifier functional groups on the level of intermolecular interactions in the system "epoxy oligomer ‒ modifier", as well as the structure formation and dynamic viscosity of epoxy oligomer has been studied in detail. Modifying additives in low concentrations contribute to an increase in the degree of structure formation of the epoxy system by increasing the intermolecular interaction between the associates of the epoxydiane oligomer.

The process of dispersion of slaked lime in a vibrating activator of the bunker type is investigated. The nature of the change in the viscosity of lime dough during machining by vibration and rotary viscometer has been studied. It is established that the process of vibroactivation of hydrated lime successively goes through the stages of proportional growth of dynamic viscosity, slowing down its growth and cessation of dispersion. The efficiency of using the vibration method for determining the viscosity of the hydrated lime - water system is shown.

The processes of the ED-20 diane epoxy resin structuring, containing disperse oxidic fillers and modifiers are studied with the help of the rotational viscometry method. It is shown that the acid -base interactions between the functional groups of the resin part molecules and the active centers of the fillers surface play the defining role in these processes. The structure degree is defined both by the total amount of the surface active centers, and their pKa value.

One of the promising directions for production of advanced materials is creation of hybrid organic-inorganic nanocomposites that demonstrate not only the improved properties of organic matrix, but also the emergence of the new specific properties due to the presence of inorganic component. Hybrid organic-inorganic materials can be synthesized by sol-gel method as a result of sol-gel process involving organic-inorganic precursors. Nowadays sol-gel technique is considered as a simple and an ecologically friendly method of nanocomposite syntheses.

The results of researching the techniques for natural gas properties determination for flow rate and volume metering systems are presented in the paper. The necessity of developing techniques for calculating the isentropic exponent of natural gas for pressure up to 25 MPa based on a simplified set of parameters of gas composition is shown.