scholarly journals Kinetics of Vinyl Polymerization of Methyl Methacrylate Initiated by Ce(IV)-Vanillin Redox System

2012 ◽  
Vol 9 (1) ◽  
pp. 430-434
Author(s):  
M. Palanivelu ◽  
K. E. N. Nalla Mohamed ◽  
T. Hidayathulla Khan ◽  
M. Prem Nawaz
Keyword(s):  
Sulfuric Acid ◽  
Methyl Methacrylate ◽  
Kinetic Scheme ◽  
Redox System ◽  
Kinetics Of Polymerization ◽  
Rate Of Polymerization ◽  
Reaction Orders ◽  
Higher Temperature ◽  
Increasing Temperature ◽  
Kinetics Of

The kinetics of polymerization of methyl methacrylate initiated by Ce(IV)-Vanillin redox system was studied in aqueous solution of sulfuric acid at 40°C. The rate of polymerization (Rp) and the reaction orders with respect to monomer, initiator and ligand have been determined and found to be 1.5, 0.5 and 0.5 respectively. The effect of concentration of sulfuric acid on the polymerization was also studied. The rate of polymerization was found to increase with increasing temperature 30–60°C and decreases at higher temperature (>60°C). The overall activation energy (Ea) was found to be 36.7 kJ/mol. A suitable kinetic scheme has been proposed.

Kinetics of Polymerization of Methyl Methacrylate Initiated by the Redox System Mn3+/Crotonic Acid

1981 ◽  
Vol 15 (8) ◽  
pp. 1461-1471
Author(s):  
Rajani K. Samal ◽  
Padma L. Nayak ◽  
Mohan C. Nayak ◽  
Akshaya K. Dhal ◽  
Purendra C. Dash ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Redox System ◽  
Crotonic Acid ◽  
Kinetics Of Polymerization ◽  
Kinetics Of

Kinetics of polymerization of acrylonitrile initiated by acidic permanganate/thioacetamide redox system

1981 ◽  
Vol 19 (11) ◽  
pp. 2759-2764 ◽  
Author(s):  
Rajani K. Samal ◽  
M. C. Nayak ◽  
G. V. Suryanarayan ◽  
G. Panda ◽  
D. P. Das
Keyword(s):  
Redox System ◽  
Kinetics Of Polymerization ◽  
Kinetics Of

scholarly journals 1,4-Dioxane Degradation Using Persulfate Ion and Ag(I) Ion

2017 ◽  
Vol 57 (2) ◽  
Author(s):  
Rosa María Felix-Navarro ◽  
Wai Lin Shui ◽  
Arturo Zizumbo-López ◽  
Sergio Pérez-Sicairos ◽  
Edgar Alonso Reynoso-Soto ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Aqueous Solutions ◽  
Reaction Rate ◽  
Experimental Results ◽  
Kinetics Of Oxidation ◽  
Decay Model ◽  
Increasing Temperature ◽  
Kinetics Of

The kinetics of oxidation of 1,4-dioxane by persulfate ion with Ag+ in aqueous solutions at various temperatures and concentrations of S<sub>2</sub>O<sub>8</sub><sup>2-</sup>, Ag<sup>+</sup> and H<sub>2</sub>SO<sub>4</sub>, were investigated. Experimental results indicate that 1,4-dioxane degradation follows a pseudo-firstorder decay model and that reaction rate significantly accelerate by increasing temperature and concentration of oxidant, sulfuric acid and Ag<sup>+</sup> ions up to 0.46 mM; for the range from 0.46-0.70 mM of Ag<sup>+</sup> ions the reaction rate remains constant and at higher concentrations the reaction rate decreases. It was possible to degrade approximately 100% of 1,4-dioxane in less than one hour with the following conditions: [Ag<sup>+</sup>] = 0.46 mM, H<sub>2</sub>SO<sub>4</sub>] = 0.30 M and from a concentration of 25 mM Na<sub>2</sub>SO<sub>4</sub>.

Effect of the structure of alkyllithium on the polymerization kinetics of isoprene

1984 ◽  
Vol 49 (10) ◽  
pp. 2269-2274 ◽  
Author(s):  
U. D. N. Bajpai ◽  
Miroslav Kašpar ◽  
Jiří Trekoval
Keyword(s):  
Induction Period ◽  
Polymerization Kinetics ◽  
The Other ◽  
Kinetics Of Polymerization ◽  
Reaction Orders ◽  
Kinetics Of

The kinetics of polymerization of isoprene in benzene initiated with ethyl-, propyl-, butyl-, hexyl-, octyl-, 2-butyl-, 3-hexyl-, 2-octyl-, and 6-methylheptyllithium was investigated. With the exception of ethyllithium , a distinct initial induction period decreasing steeply with increasing concentration of the initiator was observed for all n-alkyllithium initiators. No induction period was observed with the other initiators. The reaction orders decreased at the highest concentrations for most of the initiators, sometimes even to negative values. In the case of ethyl-, 2-butyl- and octyl-lithium this phenomenon has not been observed in the range investigated.

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