Two different apparent activation energies of the direct current electrical conductivity of polyhexandiolmaleate resins, with and without styrene, were determined in the range between 290 K and 350 K. The temperature at which the activation energy change was detected, was assigned to the upper liquid-liquid transition, T~p, where the intramolecular short range local ordering based on hydrogen bonding disintegrated. No effect by the degree of the radiation crosslinking on the Tip transition proved its intramolecular nature. Increasing the radiation crosslinking dose resulted in an increase in the apparent activation energies up to the vitrification dose which was directly dependent on the maleate content.
Посилання на статтю:
The changes in the apparent activation energies of direct current conductivity during radiation curing of unsaturated polyester resins / Irina Puci6 Mili?i6 and Franjo Ranogajec // Polymer. – 1992. – Vol 33. – P. 883-885.