viscoelastic epoxy resin can be made by addition of materials like rubbers
Another approach is the use of only aliphatic compounds, e. g. 1,4-Cyclohexane-dimethanol diglycidether or this combined with butande-1,4-diol diglycidether or added epoxydized natural oils, as a hardener you should use e. g. isophorone diamine and cure at 75°C, no catalyst used. The materials will have a Tg < 0°C.
There are a number opportunities to make thick visco elastic materials I would need more information to make a recommendation.
C. G.Delides, A.S.Vatalis, P. Pissis, R. A.Pethrick. Dielectric and thermally stimulated discharge current studies of rubber-modidied epoxy resins. Journal of Macromolecular Science – Physiscs Vol. B32 no 3, p-p 261-274 (1993).
Rubber modification is okay. However, there is segregation of rubber during use. It is better to modify the composition. You can modify dicarboxylic acid with long chain diol. The end being carboxyl, it can be reacted with epoxy and the cured product is viscoelastic. Also, you can cure epoxy with jeffamin (long chain ether amine). It will be viscoelastic in nature
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