An investigation was made of the effect of copolymers of ethylene with vinyl acetate (CEVA) on the thermodynamic stability and structural and mechanical properties of cured composites based on low-density polyethylene (LDPE) and dicumyl peroxide with crosslinking coagent trimethylolpropane trimethylacrylate (TMPTMA). It was shown that, in the presence of CEVA, thermodynamic compatibility of LDPE with TMPTMA is ensured, and the chemical network density is increased significantly.
The thermomechanical method was used to assess the density of the three-dimensional chemical network and the reliable working time of cable insulation, produced by different manufacturers, based on polyethylene crosslinked by radiation, peroxide, and silanol methods. It was shown that the reliable working time of the threedimensional chemical network is higher in the case of the peroxide crosslinking method than in the case of the silanol and radiation methods owing to the different temperature conditions of curing.
An investigation was made of the influence of the conditions of radiation crosslinking on the network density and mechanical properties of crosslinked polyethylene (XPE) at high temperatures. The optimum electron radiator generator current and speed of cable drawing that ensure the maximum network density were found. It was shown that the gel fraction does not fully characterise the degree of crosslinking and the mechanical properties of XPE.
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