Abstract: The content of the hexane-soluble part in the copolymers and the thermal properties of copolymers were measured by differential scanning calorimeter, the ethylene content in the copolymers was measured by 13C-NMR, the composition of the copolymers was analyzed by Fourier infrared spectrometer. It showed that the hexane-soluble part of the copolymer was obviously effected by the reaction pressure and reaction temperature, the thermodynamic properties and the content of ethylene in the copolymers were greatly influenced by monomer proportion, but were not obviously influenced by the temperature and pressure. The ethylene content in the hexane-soluble part was higher than hexane-insoluble part.

Key words: ethylene, propylene, gas phase copolymerization, nuclear magnetic resonance