Anionic polymerization of styrene in oxepane (hexamethylene oxide)•counter-ion, sodium

1970 ◽  
Vol 48 (13) ◽  
pp. 2031-2034 ◽  
Author(s):  
G. Löhr ◽  
S. Bywater
Keyword(s):  
Dielectric Constant ◽  
Dipole Moment ◽  
Rate Constant ◽  
Wide Temperature Range ◽  
Anionic Polymerization ◽  
Propagation Rate ◽  
Ion Pair ◽  
Temperature Range ◽  
Counter Ion ◽  
Propagation Rate Constant

The propagation reaction in the anionic polymerization of styrene in oxepane has been studied as a function of temperature and concentration of polystyrylsodium. Conductance measurements on polystyrylsodium were also made together with determinations of density, viscosity, dielectric constant, and dipole moment of oxepane itself. The measurements enabled the propagation rate constant to be determined of the polystyryl anion at 30 °C and of the ion-pair over a wide temperature range. The results have been compared with those obtained in tetrahydrofuran and tetrahydropyran.

scholarly journals Estimation of activation parameters for the propagation rate constant of styrene

1996 ◽  
Vol 34 (12) ◽  
pp. 2473-2479 ◽  
Author(s):  
Bart G. Manders ◽  
Gr�gory Chambard ◽  
Wieb J. Kingma ◽  
Bert Klumperman ◽  
Alex M. Van Herk ◽  
...  
Keyword(s):  
Rate Constant ◽  
Activation Parameters ◽  
Propagation Rate ◽  
Propagation Rate Constant

On the issue of the propagation rate constant for the cationic polymerization of 1,3-dienes

2013 ◽  
Vol 450 (1) ◽  
pp. 119-121 ◽  
Author(s):  
V. A. Rozentsvet ◽  
V. G. Kozlov ◽  
N. A. Korovina ◽  
I. A. Novakov
Keyword(s):  
Rate Constant ◽  
Cationic Polymerization ◽  
Propagation Rate ◽  
Propagation Rate Constant

THE METAL-CATALYZED AUTOXIDATION OF TETRALIN: IV. THE EFFECT OF SOLVENT AND TEMPERATURE

1964 ◽  
Vol 42 (11) ◽  
pp. 2424-2433 ◽  
Author(s):  
Y. Kamiya ◽  
K. U. Ingold
Keyword(s):  
Rate Constant ◽  
Acetic Acid Solution ◽  
Propagation Rate ◽  
Steady State Concentration ◽  
Effect Of Solvent ◽  
Kinetic Condition ◽  
Propagation Rate Constant ◽  
High Concentrations ◽  
Metal Catalyzed ◽  
State Concentration

The limiting rate of oxidation of tetralin catalyzed by cobalt, manganese, and copper decanoates has been measured in 12 solvents at 65 °C. This rate is generally determined by the kinetic condition that the hydroperoxide reaches a steady-state concentration but the experimental rates are smaller than expected in some solvents. Both cobalt and manganese are able to terminate reaction chains and they therefore act as inhibitors of the oxidation at high concentrations. The ratio of the propagation rate constant (k3) to the square root of the termination rate constant (k6) for the oxidation of tetralin in acetic acid solution is given by[Formula: see text]

ABSOLUTE RATE CONSTANTS FOR HYDROCARBON AUTOXIDATION: III. α-METHYLSTYRENE, β-METHYLSTYRENE, AND INDENE

1966 ◽  
Vol 44 (10) ◽  
pp. 1113-1118 ◽  
Author(s):  
J. A. Howard ◽  
K. U. Ingold
Keyword(s):  
Isotope Effect ◽  
Rate Constant ◽  
Rate Constants ◽  
Propagation Rate ◽  
Absolute Rate ◽  
Order Process ◽  
Deuterium Isotope Effect ◽  
First Order ◽  
Process Rate Constant ◽  
Propagation Rate Constant

Absolute rate constants for the copolymerization of α-methylstyrene and oxygen have been measured from 13 to 50 °C. The propagation and termination rate constants can be represented by[Formula: see text]Experiments with 2,6-di-t-butyl-4-methylphenol at 65 °C have shown that C6H5C(CH3):CH2 and C6H5C(CD3):CD2 have the same propagation rate constant but that chain termination involves a deuterium isotope effect (kt)H/(kt)D ≈ 1.5.Absolute rate constants for the copolymerization of oxygen with β-methylstyrene and with indene at 30 °C showed that a significant fraction of the oxidation chains were terminated by a kinetically first order process (rate constant kx). The rate constants for β-methylstyrene and indene at 30 °C are kp = 51 and 142 l mole−1 s−1, kt = 1.6 × 107 and 2.5 × 107 l mole−1 s−1, and kx = 0.61 and 1.2 s−1, respectively. The propagation rate constant for indene can be separated into a rate constant for the copolymerization with oxygen (kadd = 128 l mole−1 s−1) and a rate constant for hydrogen atom abstraction (kabstr = 14 l mole−1 s−1). In the presence of heavy water the first order process for indene had a deuterium isotope effect (kx)/(kx)D2O ≈ 3.

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