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Polymerization of olefins by ziegler catalyst. I. Polymerization of propylene by AlEt 3 TiCl 4 catalyst
Author(s) -
Kodama Shinjiro,
Kagiya Tsutomu,
Machi Sueo,
Shimidzu Takeo,
Yuasa Sachio,
Fukui Kenichi
Publication year - 1960
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1960.070030703
Subject(s) - catalysis , polymerization , activation energy , polymer , chemistry , polymer chemistry , reaction rate constant , reaction rate , molar mass distribution , ziegler–natta catalyst , atmospheric temperature range , organic chemistry , kinetics , thermodynamics , physics , quantum mechanics
The polymerization of propylene with AlEt 3 TiCl 4 catalyst was studied in detail. The molecular weight of polymers decreases with the temperature in the range 2–40°C., and increases proportionally to the pressure, but it does not depend on the AlEt 3 /TiCl 4 ratio. The rate is proportional to the amount of catalyst as well as to the propylene pressure. The optimum mole ratio of AlEt 3 to TiCl 4 is 4. In regard to the temperature, the rate is maximum at 40°C. The apparent activation energy is about 5.7 kcal./mole for the range 2–40°C. The activity of the catalyst decreases with the length of time it is kept at 40–60°C. after its formation, but at 30°C. the activity is retained almost completely for 4 hr. The polymerization rate is observed to decrease as the reaction proceeds, even at constant pressure. It is unreasonable to attribute this fact solely to the deactivation of catalyst observed at above 40°C., because such a decrease in rate occurs even at 30°C.