**3.1. The branched poly(amines)**

Epoxy resins due to their excellent mechanical and dielectric properties along with relatively low shrinkage, high resistance to elevated temperatures, and chemical media, but also the ease of processing are extensively applied in many fields, such as adhesives, coatings, and con‐ struction materials. This flexibility of properties of epoxy‐ derived materials is achieved due to the resins' tendency to undergo various modifications, usually by reactive and nonreactive fillers and different types of cross‐linking agents [17, 18]. The curing of epoxy resins involves the formation of rigid three‐dimensional network by reaction with cross‐linking agents possessing usually more than two functional groups. High cross‐linking density of epoxy systems is responsible for high impact strength of hardened epoxy resins and also at the same time for their inherent brittleness. Recently, lots of valuable papers have been published on modifications of epoxy resins, where incorporation of highly branched flexible modifiers considerably improved the mechanical behavior of epoxy materials [19–21]. Currently, hyperbranched polymers (HBPs) are of the biggest interest among all polymeric modifiers for epoxy resins. Branched structures of these resins are attractive due to their low viscosity and good ratio of reactive groups to molecular mass, especially when they are compared to their linear homologs. This makes HBPs perfect potential candidates as cross‐linking agents for epoxy resins. Knowing the influence of branching and functionality of hyperbranched polymers on material's characteristics can be used to tailor its final properties [22, 23].

The hyperbranched poly(amines) may be used as specific additives as modifiers of the phys‐ icochemical properties of the epoxy resins. Especially, branched poly(amines) such as (N,N,N‐tri(3‐aminopropyl)amine and (N,N,N′,N′‐tetra(3‐aminopropyl) ethylene‐diamines may be used as specific additives—cross‐linking agents for this type of resins.
