Study of the annealing temperature effect on the crosslinking ratio of LDPE and ethylene-propylene-norbornene copolymer blends (EPDM) – RAPID COMMUNICATION
Polimery 1997, No 6, 404
The crosslinking ratio of LDPE and EPDM and their blends in the 1,1-di-tert-butyl-3,5,5-trimethylcyclohexane peroxide-initiated free-radical reaction was studied in relation to annealing temperature. Over 110—180°C, the ratio was decreasing and attained a minimum at the highest temperature. Triallyl cyanurate used as a crosslinking co-agent modified the crosslinking ratio vs. temperature relationship so that, at110°C and 120°C, the crosslinking reaction was impeded. The ratio was maximumat 130°C. In the presence of the co-agent, the ratio was also related to LDPE and EPDM mass fractions in the blends, attaining a minimum at a 60% EPDM content.