Dielectric Relaxation Behavior of Polyethylene Grafted with Acrylic Acid, 2-Hydroxyethylmethacrylate and their Binary Mixtures

Dielectric investigation of low density polyethylene grafted with acrylic acid (AA) and 2-hydroxyethylmethacrylate (HEMA) and their mixtures was carried out. The dielectric properties of different samples with different graft contents lower than 30% wt. were measured in the frequency range of 10 ^-2 -10 ⁶ Hz and the temperature range of 50°-175°C.Only one relaxation pro cess is observed in the case of polyethylene grafted with acrylic acid (PE-PAA). The observed process is attributed to the cooperative reorientation of the poly acrylic acid chains modified by their connections to the polyethylene. The melt ing of the polyethylene crystalline phase does not influence the relaxation behavior of the polyacrylic acid phase.