INFLUENCE OF CONCENTRATION OF THIOKOL AND AMOUNT OF THE HARDENER ON PROPERTIES OF EPOXIDE-POLYSULPHIDE COMPOSITES
DOI:
https://doi.org/10.15421/jchemtech.v29i4.236607Keywords:
epoxy resin, polysulphide rubber, preliminary thioetherification reaction, hardener, deformation-strength, adhesion and dynamic mechanical propertiesAbstract
A systemic study of the possibility of regulating the deformation-strength, adhesion and dynamic mechanical properties of epoxy-polysulphide composites based on the products of the preliminary thioetherification reaction (PRTE) by varying the concentration of polysulphide rubber, as well as changing the amount of the hardener and using a mineral filler has been carried out. An increase in the content of rubber in the product of the preliminary thioetherification reaction was found to promote an increase in the characteristics of cohesive and adhesive strength, deformation at break and the work of destruction of the material. An increase in the complex of properties is assumed to result from the formation of higher molecular weight products with an increase in the rubber content in the composition subjected to PRTE. The formation of such products is confirmed by the data of dynamic mechanical spectrometry. It has been shown that by changing the amount of the introduced hardener, i.e., by changing the ratio of amine and epoxy groups, it is possible to effectively regulate the deformation and strength characteristics of epoxy-polysulphide mixtures. With an increase in the content of the hardener, the tensile strength, deformation at break and the work of destruction of the material increase very significantly. It was found that the introduction of a filler into an epoxy system containing a large amount of rubber promotes an increase in cohesive strength with a relatively small decrease in adhesion strength and deformation at break.
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