ABSTRACT
Adhesive compositions on the base of polyolefins blends were first investigated and applied at the end of the last century [1-4]. In particular, it was shown that by mixing low-density polyethylene (high pressure, LDPE) and ethylene-vinyl acetate copolymers (EVA) in the presence of a mineral filler (talc) there is an extreme increase in the strength of an adhesive compound of the polymer mixture composition with the metal (steel) compared to raw materials [1-4]. It was shown later [5-7] that when mixing EVA with various concentrations of vinyl acetate units with each other synergistic effect is also realized – at filling talc there is an extreme increase in the strength of an adhesive compound with the metal. The reasons for this behavior of the compositions are considered in works [8, 9], but the questions about the effect of the colloidal structure of the polyolefin composition on the adhesive strength of the polymer-substrate remain unresolved. You can expect that for mixture compositions the strength of adhesive bonding will be determined by which of the copolymers – “nonadhesionnoactive” (LDPE) or “adhesionnoactive” (ethylene copolymer) will form a continuous phase in the mixture. To answer this question we chose as an object of study the system of LDPE + EVA, as they are described in detail in the literature in terms of assessing of their adhesion and physical and mechanical properties depending on the composition of the mixture [1-4, 10, 11]. In addition, for systems of LDPE-EVA the phase diagrams are constructed [12]. They give an idea about the compatibility of LDPE and EVA with different molecular characteristics and content of vinyl acetate units.
