Evaluation of the Thermal Stress Relaxation Method for the Estimation of Polysulfidic Crosslinks in Natural Rubber Vulcanizates

1972 ◽  
Vol 45 (4) ◽  
pp. 1064-1073 ◽  
Author(s):  
J. H. Farmer ◽  
J. E. Stuckey
Keyword(s):  
Thermal Stress ◽  
Stress Relaxation ◽  
Natural Rubber ◽  
Relaxation Method ◽  
Order Rate Constant ◽  
Exchange Reactions ◽  
Fast Relaxation ◽  
Thermal Stress Relaxation ◽  
Natural Rubber Vulcanizates ◽  
Linear Manner

Abstract The variation of the polysulfidic crosslink content of a natural rubber vulcanizate during cure has been determined from thermal stress relaxation data obtained using a Monsanto Rheometer and the results have been compared with those obtained by chemical probe analysis. No correlation could be found. Attempts to isolate the relaxation due solely to polysulfide crosslink interchange gave no better agreement and it is concluded that competing maturing reactions prevent such a resolution. The first order rate constant for the fast relaxation attributed to polysulfide crosslink exchange reactions has been found to vary in a linear manner with the total crosslink density of the vulcanizates.

Aging of Natural Rubber Vulcanizates in the Presence of Dithiocarbamates

1959 ◽  
Vol 32 (3) ◽  
pp. 739-747 ◽  
Author(s):  
J. R. Dunn ◽  
J. Scanlan
Keyword(s):  
Stress Relaxation ◽  
Natural Rubber ◽  
Protective Action ◽  
Dicumyl Peroxide ◽  
Vulcanized Rubber ◽  
Aging Properties ◽  
Photochemical Aging ◽  
Natural Rubber Vulcanizates

Abstract The thermal and photochemical aging of extracted dicumyl peroxide-, TMTD (sulfurless)- and santocure-vulcanized rubber, in presence of a number of metal and alkylammonium dithiocarbamates, has been investigated by measurements of stress relaxation. The dithiocarbamates have a considerable protective action upon the degradation of peroxide- and TMTD-vulcanizates, but they accelerate stress decay in santocure-accelerated vulcanizates. The reasons for this behavior are discussed. It is suggested that the excellent aging properties of unextracted TMTD vulcanizates are due to the presence of zinc dimethyldithiocarbamate formed during vulcanization.

scholarly journals Laminated Aluminum/Graphite Composite Roll with High Thermal Conductivity and Thermal Stress Relaxation Effect

2016 ◽  
Vol 19 (6) ◽  
pp. 441-450 ◽  
Author(s):  
Yuka Yamada ◽  
Hiroshi Hohjo ◽  
Hidehiko Kimura ◽  
Atsushi Kawamoto ◽  
Tadayoshi Matsumori ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stress ◽  
Stress Relaxation ◽  
Relaxation Effect ◽  
High Thermal Conductivity ◽  
Graphite Composite ◽  
Thermal Stress Relaxation

Effect of alloying elements on thermal stress relaxation in filler metal

1985 ◽  
Vol 27 (10) ◽  
pp. 778-781
Author(s):  
A. S. Tabatchikov ◽  
A. V. Pryakhin ◽  
L. N. Barmin
Keyword(s):  
Thermal Stress ◽  
Stress Relaxation ◽  
Filler Metal ◽  
Alloying Elements ◽  
Thermal Stress Relaxation ◽  
Effect Of Alloying
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