INFLUENCE OF POLYOXYPROPYLENETRIAMIN AND CONTENT OF OXIRANE RINGS ON PROPERTIES OF EPOXY-POLYSULFIDE COMPOSITES

Konstantin M. Sukhyy; Elena A.  Belyanovskaya; Alla N. Nosova; Liliya A. Frolova; Mikhaylo K.  Sukhyy; Huang Yudong; Yuriy S. Kocherhin; Tetiana I. Hryhorenko

doi:10.15421/jchemtech.v30i4.260487

Authors

Konstantin M. Sukhyy Ukrainian State University of Chemical Technology, Ukraine https://orcid.org/0000-0002-4585-8268
Elena A. Belyanovskaya Ukrainian State University of Chemical Technology, Ukraine https://orcid.org/0000-0003-1873-4574
Alla N. Nosova Ukrainian State University of Chemical Technology, Ukraine https://orcid.org/0000-0002-0595-5290
Liliya A. Frolova Ukrainian State University of Chemical Technology, Ukraine https://orcid.org/0000-0001-7970-2264
Mikhaylo K. Sukhyy Ukrainian State University of Chemical Technology, Dnipro, Ukraine https://orcid.org/0000-0002-4272-3704
Huang Yudong Harbin Institute of Technology, China https://orcid.org/0000-0002-8019-6618
Yuriy S. Kocherhin Harbin Institute of Technology, China https://orcid.org/0000-0002-0073-7622
Tetiana I. Hryhorenko Harbin Institute of Technology, China https://orcid.org/0000-0003-4583-575X

DOI:

https://doi.org/10.15421/jchemtech.v30i4.260487

Keywords:

epoxy resins; polysulfide rubber; a preliminary thioetherification reaction; polyoxypropylenetriamine; deformation-strength, adhesive and dynamic mechanical properties; epoxy group content.

Abstract

The possibilities of controlling the deformation-strength, adhesive and dynamic mechanical properties of epoxy-polysulfide composites based on the products of the preliminary thioetherification reaction (PRTE) with the help of small additions of polyoxypropylenetriamine and changing the concentration of oxirane cycles in the epoxy resin are determined. It has been established that the introduction of polyoxypropylenetriamine into compositions based on the products of the preliminary reaction of thioetherification of epoxy resin with liquid polysulfide rubber (thiokol) leads to an increase in adhesive and cohesive strength, strain at break, and the work of destruction of the material. The effect is achieved both by adding polyoxypropylenetriamine to a mixture of epoxy resin with liquid thiol during PRTE, and by using it as a co-hardener when curing PRTE with diethylenetriamine. It has been shown that the presence of polyoxypropylenetriamine in the PRTE product has a significant effect on the dynamic mechanical characteristics of the cured composition. The introduction of polyoxypropylenetriamine contributes to a noticeable increase in the dynamic modulus of elasticity in the region of the glassy state of the composite and the molecular weight of the chain section between the nodes of the chemical network, as well as the maximum value of the mechanical loss tangent and loss modulus. An extreme dependence of the adhesive shear strength of adhesive joints made using PRTE products on the content of epoxy groups in the resin has been revealed. The effect of strengthening adhesive joints due to modification with polysulfide rubber is most pronounced for epoxy resins, in which the content of oxirane cycles ranges from 8 to 15 %.

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Catalog Epikote https://www.hexion.com/en-GB/brand/epikote.