Influence of cross-linking on properties of PEVA used for cable sheaths

Abstract

Polyethylene vinyl acetate (PEVA) is a material widely used among others in cable industry for halogen-free cable insulation. A manufacturing blend is not a pure polymer; it contains various additives such as for example flame retardants. The paper compares properties of a basic granulate with properties of a produced cross-linked cable sheath. Thermal effects were analysed both in positive and negative temperatures in the temperature range from -150 °C to 700 °C. Differential scanning calorimetry, thermogravimetry and dynamical mechanical analysis were applied. The obtained results showed, that melting temperature, glass transition temperature, heat of fusion and crystallinity of the material decrease whereas tensile strength and temperature of thermal decomposition increase with PEVA cross-linking.