Thermoactivational spectroscopy of polyethylene polymer films with an ethylene-vinyl acetate copolymer

Abstract

The article reports the results of the study of polymer films based on the blend of high-pressure polyethylene (LDPE) and the ethylene-vinyl acetate copolymer (EVA, sevilen). The films were investigated with thermally stimulated depolarization. It is noted that one maximum is observed on the temperature dependences of the depolarization currents obtained for samples with different sevilen content. It is assumed that this maximum corresponds to the dipole-segmental relaxation that occurs in high-pressure polyethylene. Calculation results of activation energies corresponding to this process allow us to conclude that an increase in the proportion of EVA in the blend leads to an increase in the dipole-segmental mobility and, as a consequence, to an increase in the flexibility of the polymer.

Keywords

• polyethylene
• ethylene-vinyl acetate copolymer
• thermally stimulated depolarization
• thermoactivational spectroscopy
• dipole-segmental relaxation