Study of the Reaction Kinetics of Aging of Natural Rubber by Means of Infrared Spectrography. III. Effect of Light and Influence of Antioxidants

1955 ◽  
Vol 28 (4) ◽  
pp. 968-988 ◽  
Author(s):  
V. Kellö ◽  
A. Tkáč
Keyword(s):  
Natural Rubber ◽  
Reaction Kinetics ◽  
Kinetics Of ◽  
Effect Of Light

The Reaction Mechanism of Thiuram Disulfide Vulcanization of Poly-1,5-Dienes, Particularly of Natural Rubber

1957 ◽  
Vol 30 (2) ◽  
pp. 393-396
Author(s):  
G. Blelstein ◽  
W. Scheele
Keyword(s):  
Reaction Mechanism ◽  
Natural Rubber ◽  
Temperature Dependence ◽  
Reaction Kinetics ◽  
Experimental Work ◽  
Complete Solution ◽  
Experimental Results ◽  
Present Treatment ◽  
Final Interpretation ◽  
Kinetics Of

Abstract In previous publications on thiuram vulcanization we confined ourselves to the presentation and discussion of our extensive experimental work. We had investigated quantitatively the conversion of thiuram disulfides and were in a position to describe the kinetics of thiuram vulcanization. Such investigations are, of course, of particular value to technology for information about the rate and temperature dependence of vulcanization reactions. Our experiments were therefore not primarily designed to determine the details of reaction mechanism, which we had hitherto treated with restraint, and experience shows that the study of reaction kinetics does not always provide the key to a complete solution. All the same, it now seems reasonable to pick out some of the results we have obtained, and so consider the question of a reaction mechanism for thiuram vulcanization. We should, however, like to state, that although the present treatment concerns matters which may include some pertinent points, it does not necessarily represent a final interpretation. It is to be stressed, that any postulated reaction mechanism must explain what we regard as a stoichiometrical, i.e., concentration and temperature independent conversion of thiuram disulfide to zinc dithiocarbamate. The following experimental results thus formed the basis of our considerations:

Impact Of Synthesis Route on the Water Oxidation Kinetics of Hematite Photoanodes

2020 ◽  
Author(s):  
Camilo A. Mesa ◽  
Ludmilla Steier ◽  
Benjamin Moss ◽  
Laia Francàs ◽  
James E. Thorne ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Reaction Kinetics ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Oxidation Reaction ◽  
Charge Accumulation ◽  
Optical Signals ◽  
Current Voltage ◽  
Voltage Performance ◽  
Kinetics Of

<p><i>Operando</i> spectroelectrochemical analysis is used to determine the water oxidation reaction kinetics for hematite photoanodes prepared using four different synthetic procedures. Whilst these photoanodes exhibit very different current / voltage performance, their underlying water oxidation kinetics are found to be almost invariant. Lower photoanode performance was found to correlate with the observation of optical signals indicative of charge accumulation in mid-gap oxygen vacancy states, indicating these states do not contribute directly to water oxidation.</p>

Chemical Analysis and Reaction Kinetics of EA-2192 in Decontamination Solution for the MMD-1 Project

2003 ◽  
Author(s):  
David J. McGarvey ◽  
H. D. Durst ◽  
William R. Creasy ◽  
Jill L. Ruth ◽  
Kevin M. Morrissey
Keyword(s):  
Chemical Analysis ◽  
Reaction Kinetics ◽  
Kinetics Of ◽  
Decontamination Solution

Kinetics of catalytic conversion of methanol at higher pressures

1980 ◽  
Vol 45 (12) ◽  
pp. 3402-3407 ◽  
Author(s):  
Jaroslav Bartoň ◽  
Vladimír Pour
Keyword(s):  
Low Temperature ◽  
Reaction Kinetics ◽  
Water Vapour ◽  
Kinetic Data ◽  
Catalytic Conversion ◽  
The Given ◽  
Kinetics Of

The course of the conversion of methanol with water vapour was followed on a low-temperature Cu-Zn-Cr-Al catalyst at pressures of 0.2 and 0.6 MPa. The kinetic data were evaluated together with those obtained at 0.1 MPa and the following equation for the reaction kinetics at the given conditions was derived: r = [p(CH3OH)p(H2O)]0.5[p(H2)]-1.3.

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