Naslov
The Changes In Apparent Activation Energies Of Direct Current Conductivity During Radiation Curing Of Unsaturated Polyester Resins

Autori
Pucić Miličić, Irina ; Ranogajec, Franjo

Izvornik
Polymer (0032-3861) 33 (1992), 4; 883-885

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
unsaturated polyester resins ; apparent activation energies of direct current conductivity ; liquid-liquid transition ; radiation crosslinking ; vitrification dose
(Nezasićene poliesterske smole ; prividna energija aktivacije DC vodljivosti ; prijelaz tekuće-tekuće ; radijacijsko umrežavanje ; vitrifikacijska doza)

Sažetak
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, Tlp, where the intramolecular short range local ordering based on hydrogen bonding disintegrated. No effect by the degree of the radiation crosslinking on the Tlp 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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA