Effect of plasticizers of different polarity on dynamic mechanical properties of butyl rubber

The article presents the results of studies of the influence of the concentration of three types of plasticizers with different percentages on the dynamic mechanical properties of mixtures based on elastomer: butyl rubber (BR) / industrial oil, BR/chlorinated paraffin, BR/dioctyl phthalate. Plasticizers were taken in a ratio of 20 to 40% by volume. The leading research methods were a comparative analysis of the temperature-frequency dependence of the loss tangent and the elastic modulus, obtained by the method of dynamic mechanical analysis (DMA). The developed compositions of the composite material were tested by IR spectroscopy. It has been established that in order to obtain self-adhesive composite materials with high damping properties, a plasticizer-industrial oil with a minimum content of 40 % should be used. Based on the conducted studies, it was proved that when plasticizers of various types and polarities are introduced into butyl rubber, the properties of the compositions change depending on the concentration of the plasticizer, the molecular structure and the forces of intermolecular interaction. It was revealed by infrared spectroscopy that no chemical interaction occurs in the polymer matrix of butyl rubber, on the grounds that the influence of the components on the intensity or magnitude of the peak is not traced.