Chain Transfer to Solvent in Propene Polymerization with Ti Cp-phosphinimide Catalysts: Evidence for Chain Termination via Ti–C Bond Homolysis

ACS Catalysis ◽  
2016 ◽  
Vol 6 (11) ◽  
pp. 7989-7993 ◽  
Author(s):  
Christian Ehm ◽  
Roberta Cipullo ◽  
Miriana Passaro ◽  
Francesco Zaccaria ◽  
Peter H. M. Budzelaar ◽  
...  
Keyword(s):  
Chain Transfer ◽  
Chain Termination ◽  
Propene Polymerization ◽  
Bond Homolysis

Metal complexes as antioxidants. 7. Kinetics of inhibition of styrene autoxidation by zinc di-isopropyldithiophosphate

1980 ◽  
Vol 58 (1) ◽  
pp. 92-95 ◽  
Author(s):  
J. A. Howard ◽  
S-B. Tong
Keyword(s):  
Chain Transfer ◽  
Peroxy Radical ◽  
Chain Termination ◽  
Oxygen Absorption ◽  
Reaction Products ◽  
Radical Chain ◽  
Chain Initiation ◽  
Styrene Concentration ◽  
Kinetics Of ◽  
Kinetics Of Inhibition

Rates of oxygen absorption by styrene (RH) containing 2,2,3,3-tetraphenylbutane and zinc di-isopropyldithiophosphate at 30 °C obey the rate law [Formula: see text] where Ri is the rate of free-radical chain initiation. This order with respect to the styrene concentration implies extensive chain transfer from the poly(peroxystyryl)peroxy radical to a radical derived from the inhibitor. Reaction products confirm the displacement of a di-isopropyldithiophosphoryl radical in the chain termination reaction.Diethyldithiophosphoric acid also inhibits styrene autoxidation by a mechanism which involves extensive chain transfer.

Calculation and Analysis of the Molecular Weight Characteristics of the Polymer in the Synthesis of Butyl Rubber

2022 ◽  
Vol 1049 ◽  
pp. 224-231
Author(s):  
Irina Antonova ◽  
Regina Dmitricheva ◽  
Veronika Bronskaya ◽  
Guzel Aminova ◽  
Iliya Lapin ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Molecular Weight ◽  
Catalytic System ◽  
Chain Transfer ◽  
Methyl Chloride ◽  
Chain Termination ◽  
Butyl Rubber ◽  
Chain Growth ◽  
Molecular Weight Characteristics ◽  
Cationic Copolymerization

The article compiled a mathematical model of the cationic copolymerization of isobutylene and isoprene using a catalyst AlCl3 in a CH3Cl solution, including the reactions of initiation, chain growth, chain transfer to the monomer, and chain termination. The molecular weight characteristics of butyl rubber synthesized in methyl chloride using a catalytic system based on aluminum trichloride have been investigated. Relationships are obtained for calculating the moments of the molecular weight characteristics of butyl rubber. The effect of the concentration of the initiator on the conversion versus time was investigated.

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