Terpolymerization of ethylene,propylene, and butene-1 with highly active supported titanium catalyst

An investigation of ethylene-propylene-butene-1 terpolymerization in the presence of TiCl₄, Ti(OBu)₄/MgCl₂/ethylbenzoate (EB)/π₂SiCl₂/AlEt₃ catalyst is described. The catalytic efficiency is very high, i.e., 86000g/g Ti under ambient conditions. The decay rate of terpolymerization with time fulfills the equation: R_t = R_s + (R₀ - R_s)e^?βt. Characterizations with DSC, WAXD, ¹³C-NMR, and solvent extraction of the resulting terpolymers were studied. Terpolymers of certain composition are elastomers without detectable crystallinity, which demonstrates a rather random sequence distribution and makes them promising for quality rubber. The assignment of the chemical shifts in ¹³C-NMR spectra is made. The gas permeabilities of the terpolymer membrane is of PO₂ = 2.35 × 10^-9 cm³ (STP) cm/cm² s cm Hg and PO₂/PN₂ = 3.8 under optimum conditions.