TERPOLYMERIZATION OF PROPENE, ETHYLENE AND 1-DODECENE WITH HIGHLY EFFICIENT SUPPORTED CATALYST

The terpolymerization of propene, ethylene and 1-dodecene (PED) with a highly efficient supported Ziegler-Natta catalyst and the main physical and mechanical properties of PED terpolymers were investigated. It was found that, under equal polymerization conditions, the polymerization activities followed the order: PED terpolymerization > PE, PD copolymerizations > E, D homopolymerizations. The C-13 NMR spectra of PED terpolymers indicated the existence of long propylene chain sequences. The content of ethylene and 1-dodecene in PED terpolymers increased with the enhancement of the mole ratio of ethylene in the gas feed, whereas the effect of the concentration of 1-dodecene in the reactor is much smaller. The intrinsic viscosity, density, melting temperature and crystallinity of the terpolymers decrease when the amount of comonomers in the feed increases. Compared with polypropene, the tensile and bending strengths of PED terpolymers are reduced, but the elongation at break is over 700%, and the Izod impact is enhanced both at ambient and low temperatures.