Abstract
Carrying out the propylene polymerization with titanium trichloride-triethyl aluminum catalyst under the usual condition (Al/Ti=1, 10-60°, and 550-740 mm Hg), we have the following kinetic equation for the decreasing part of the polymerization rate.
_??_
with
_??_
where v∞ is the stationary rate, P the pressure of propylene, τ the polymerization time, f, k0 and B0 are constant. This gives
_??_
for the polymerization time τ4/3, at which the rate v equals to 4/3v∞. The latter is the same form as that for τ4/3 reported by Natta and Pasquon who examined an increasing type of the polymerization rate, excepting the energy is 10 kcal/mol. It has been pointed out that there may be a common kinetic law
_??_
for the both changes of the rate in the initial stages of the polymerization.
