2.3. Propylene polymerization
In a typical reaction (run 4 in Table 1), a Parr 450-mL stainless steel autoclave reactor equipped with a mechanical stirrer
was charged with 1.0 bar propylene. 30 ml of heptane, 0.2 mL of MAO (1.4 M in toluene) and 0.2 ml of TIBA (1.1 M in toluene) were injected into the reactor sequentially and the mixture was stirred vigorously for 5 min at 60 ◦C. About 20 mg of the above-obtained “two-in-one” catalyst in 20 ml of heptane was then added to the stirring solution. And 4.0 bar of propylene was fed into the reactor to start the polymerization reaction, which maintained constant
throughout the course of the polymerization. After 30 min of polymerization, the reactor pressure was released and the reaction solution discharged from the reactor and quenched with acidi- fied ethanol. The resulting polymer was filtered and finally dried under vacuum at 50 ◦C for 8 h. About 9.48 g of polymer product was obtained.