Diversity of ion path in low density polyethylene solid

Electrical and Thermal properties of low density poly(ethylene) (LDPE) were observed by the measurement with the impedance analyzer and the differential scanning calorimetry (DSC) respectively. The frequency dispersion curves of the electric modulus were analyzed and investigated in comparison with the DSC data. The samples are annealed during various times. From the DSC data, it was found that the crystalline structure changes into more inhomogeneous structure on lamella thickness with increase in annealing time. On the other hand, the electrical experiment shows the plural process of ionic conduction on the frequency dispersion curves of the electric modulus. The number of processes is increased in the range from 1 to 3 with increase in the annealing time. in this manner, the correspondence between the result of the electrical experiment and the DSC strongly suggest that the ions included in LDPE move through the non-crystalline parts near the crystallite surface because the inhomogeneity in lamella thickness produces the inhomogeneity in the parts near the surface of the lamella.