No abstract

A series of low-density polyethylene (LDPE) blends with different amounts of ethylene-vinyl-acetate (EVA) was prepared and irradiated with 10 MeV electron beam in the range of 0 -250 kGy at room temperature in air. EVA was used as a compatibilizer and softener in four different amounts: 5, 10, 20, and 30 wt %, based on polyethylene (PE). The crosslinking of the samples was studied on the basis of gel-content measurements as well as some thermal and mechanical properties of the specimens. The results indicated that the LDPE and LDPE-EVA blends could be crosslinked by a high-energy electron beam, of which their thermal and mechanical properties changed effectively, however, because of EVA content of the polymer; the blends were more sensitive to lower doses of radiation. These studies were carried out to obtain a suitable compound for heat-shrinkable tubes.

No abstract

Theoretical calculations which take into account thermally stimulated conductivity are presented. The model used has been established for the case of a single type of electron trap, a single type of recombination centre and in the presence of thermally disconnected deep traps. The conductivity relation has been derived and solved numerically in order to determine electron trap depths. It was then tested in the case of CdS single crystals doped with copper ions. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)