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An automated system was designed to study in a continuous regime the rheological properties of the care polymeric compositions using the damped vibration method.In a parallel mode measurements of rheological and acoustic characteristics of the care compositions were made on the basis of epoxy resin.Dependencies of shear modulus,viscosity,the sound speed,and the damping coefficient as functions of polymerization were presented.Dynamics of spectral characteristics of acoustic signals in the polymerization were investigated.Comparison of the experimental results obtained reveals that the dynamics of the variation of acoustic and rheological properties is significantly different.The major change of acoustic characteristics occurs in the initial stage of the solid state formation when a transition from a liquid-to-gel like state takes place.Rheological characteristics vary dramatically at the crossover from a high-viscosity to solid state.In the frequency dependencies of an acoustic signal a number of essential features were observed.
An automated system was designed to study in a continuous regime the rheological properties of the care polymeric compositions using the damped vibration method. In a parallel mode of measurement of rheological and acoustic characteristics of the care compositions were made on the basis of epoxy resin. Dependencies of shear modulus, viscosity, the sound speed, and the damping coefficient as functions of polymerization were presented. Dynamics of the acoustic signals in the polymerization were investigated. Comparison of the experimental results obtained reveals that the dynamics of the variation of acoustic and rheological properties is significantly different.The major change of acoustic characteristics occurs in the initial stage of the solid state formation when a transition from a liquid-to-gel like state takes place.Rheological characteristics vary dramatically at the crossover from a high-viscosity to solid state.In the frequency dependencies of an acoustic signal a number of essential features were observed.