The structure and properties of peroxide crosslinked LDPE and silane crosslinked LDPE were comparaed in gel content

equilibrium swelling ratio and high temperaturemodulus. The crosslinking densities of LDPE vulcanizates were measured by the method ofhigh temperature modulus. When the two kinds of crosslinking LDPE’s gel contents aresimilar

the crosslinked densities of peroxide crosslinking LDPE are obviously smaller thanthose of silane crosslinked LDPE. Using equilibrium swelling ratio or crosslinked density to characterize the crosslinking degree of LDPE vulcanizates is more appropriate than usng gel content. The Huggins parameter of LDPE/boiling benzene system was also determined as 0.30.