NUMBER OF ACTIVE CENTRES AND PROPAGATION RATE CONSTANTS IN THE PROPENE POLYMERISATION ON SUPPORTED TITANIUM-MAGNESIUM CATALYSTS IN THE PRESENCE OF HYDROGEN
Bukatov, GD; Goncharov, VS; Zakharov, VA
| HERO ID | 1313060 |
|---|---|
| In Press | No |
| Year | 1995 |
| Title | NUMBER OF ACTIVE CENTRES AND PROPAGATION RATE CONSTANTS IN THE PROPENE POLYMERISATION ON SUPPORTED TITANIUM-MAGNESIUM CATALYSTS IN THE PRESENCE OF HYDROGEN |
| Authors | Bukatov, GD; Goncharov, VS; Zakharov, VA |
| Journal | Macromolecular Chemistry and Physics |
| Abstract | Polymerisation inhibition with radioactive carbon monoxide was used to determine the number of active centres and the propagation rate constant in the isospecific polymerisation of propene with the catalytic system titanium tetrachloride/diisobutyl phthalate /magnesium chloride-triethylaluminium-phenyltriethoxysilane. The presence of hydrogen decreased the number of active centres (by a factor of 2) and increased the propagation rate constant (by a factor of about 4). In the absence of hydrogen, a considerable part of the active centres (titanium-polymer bonds) reacting with the carbon-14 monoxide seemed to be inactive in the propene polymerisation for steric reasons. Hydrogen was able to transform such centres into an active state. Thus a propagation rate constant value of 2500 L/(mol s) at 70C for propene polymerisation in the presence of hydrogen seems to be correct, since the portion of centres in the active state is maximum. The influence of polymerisation time, external donors and internal donors on the number of active centres and the propagation rate constant was studied. 25 refs. |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | POLYMERIZATION CATALYST; POLYPROPYLENE; PP; TABLES; TECHNICAL; GRAPH; ACTIVE CENTRE; STEREOSPECIFIC POLYMERIZATION; POLYMERISATION CATALYST; STEREOSPECIFIC CATALYST; PLASTIC; STEREOSPECIFIC POLYMERISATION; POLYMERIZATION TIME; PROPAGATION RATE; POLYMERISATION COCATALYST; POLYMERIZATION COCATALYST; DATA; RUSSIA; THERMOPLASTIC; POLYMERISATION TIME |