Rubber Or Synthetic Rubber Compounds Coolant Resistant (55-65)

1956 ◽  
Author(s):  
Keyword(s):  
Synthetic Rubber ◽  
Rubber Compounds

High-Temperature Oven Aging of Oil-Resisting Synthetic Rubber Compounds

1945 ◽  
Vol 18 (3) ◽  
pp. 667-678
Author(s):  
G. D. McCarthy ◽  
A. E. Juve ◽  
H. Boxser ◽  
M. Sanger ◽  
S. R. Doner ◽  
...  
Keyword(s):  
High Temperature ◽  
Constant Temperature ◽  
Test Tube ◽  
Principal Factor ◽  
Synthetic Rubber ◽  
Rubber Compounds ◽  
Exposure Temperature ◽  
Hardness Change ◽  
Temperature Exposure ◽  
Good Heat

Abstract An investigation of the effect of varying conditions of high-temperature exposure has shown that, at a constant temperature, the supply of oxygen is the principal factor which causes stiffening of the vulcanizates. The loss of volatile plasticizers, when present, also contributes to the stiffening. The test-tube technique, developed in the course of this investigation, in which dumbbell samples are suspended in stoppered test-tubes (38 by 300-mm.) heated by immersion in an oil bath, appears to give results which are considerably more duplicable than those obtained by the usual aging in circulating air ovens. The test-tube technique also gives somewhat better differentiation between good-heat aging and poor-heat aging compounds. The rate of deterioration as measured by elongation change is doubled for an 18° F increase in the exposure temperature. As measured by hardness change the rate is doubled by an increase of 42° F. Tests run at 250° F by this method are no more reproducible than those run at 300° F.

Liquid guayule natural rubber, a renewable and crosslinkable processing aid in natural and synthetic rubber compounds

2020 ◽  
Vol 276 ◽  
pp. 122933
Author(s):  
Xianjie Ren ◽  
Cindy S. Barrera ◽  
Janice L. Tardiff ◽  
Andres Gil ◽  
Katrina Cornish
Keyword(s):  
Natural Rubber ◽  
Synthetic Rubber ◽  
Rubber Compounds ◽  
Natural And Synthetic

Goodyear Medalist Lecture. Goodyear Medalist Lecture Towards Understanding of the Rheology of Rubber Compounds and their Processing

2009 ◽  
Vol 82 (2) ◽  
pp. 131-148 ◽  
Author(s):  
James L. White
Keyword(s):  
Rheological Properties ◽  
Processing Technology ◽  
Early Age ◽  
Technical Literature ◽  
Technical Problems ◽  
Rubber Industry ◽  
Professional Career ◽  
Synthetic Rubber ◽  
Rubber Compounds ◽  
The Usa

Abstract The problems of the rheological properties of rubber compounds and the understanding of the processing operations that are used to produce rubber products have received relatively little study in the literature compared to thermoplastics. This seems in part due to an almost 200 year old tradition of industrial secrecy and the vertically integrated nature of the synthetic rubber producer — tire manufacturer combines in the USA. Thus while abundant information has always been available from thermoplastics suppliers on processing technology, little has been available on rubber. Because I began my professional career in the rubber industry and became from an early age concerned with its technical problems, I have not been swayed to the same extent by the thermoplastics dominated technical literature as others in the polymer community.

Stress Relaxation in Compression of Rubber and Synthetic Rubber Vulcanizates Immersed in Oil

1953 ◽  
Vol 26 (2) ◽  
pp. 336-349
Author(s):  
J. R. Beatty ◽  
A. E. Juve
Keyword(s):  
Stress Relaxation ◽  
Natural Rubber ◽  
Synthetic Rubber ◽  
Rubber Compounds ◽  
Frictional Forces ◽  
Practical Implications

Abstract The practical implications of this study are that rubber compounds which swell in the presence of oil have a property which may be utilized in some applications where it may serve a useful purpose. Examples are O-ring seals and other types of gaskets, where the rubber is used in compression. In these cases the stress decays more slowly with time, and in some cases the force would increase, and the tendency to leakage would be minimized. In these experiments the sample was relatively unconfined except for the direction of loading with only low frictional forces which tended to prevent increase in volume. It was noted (Figures 4 and 6) that, with natural rubber and GR-S at 70° C the stress reached a maximum between 1000 and 10,000 hours, which is a result of the sample reaching equilibrium with respect to swelling by the oil, and the stress then decreases, depending on the oxidative scission of bonds in the same manner as found for tests conducted in air. However, according to Scott, the attack of swelling agents accelerates oxidation; so it is possible that this oxidative scission might be in addition to that normally measured in air.

Carboxylic Rubbers. I. Synthesis and Structures

1959 ◽  
Vol 32 (1) ◽  
pp. 321-327 ◽  
Author(s):  
B. A. Dolgoplosk ◽  
E. I. Tinyakova ◽  
V. N. Reĭkh ◽  
T. G. Zhuravleva ◽  
G. P. Belonovskaya
Keyword(s):  
Polymer Chain ◽  
High Strength ◽  
Chemical Compounds ◽  
Good Resistance ◽  
Synthetic Rubber ◽  
Rubber Compounds ◽  
Work Done ◽  
Styrene Butadiene ◽  
Resistance To Heat ◽  
Butadiene Styrene

Abstract It is well known that the high strength of unfilled (pure gum) natural rubber and some synthetic rubber compounds can be explained by the homogeneity of the polymer chain which determines its ability to crystallize or to orient on stretching. The character of the vulcanization network as well as the structure of the main chain is of importance. This has been verified by the use of polyethylene polyamines and other chemical compounds as vulcanization accelerators for butadiene-styrene rubber (SKS-30A) to produce high strength (up to 200 kg/cm2) gum rubber compounds. In certain cases, only the structure of the vulcanization network obtained with carboxyl-containing rubber compounds can account for obtaining the same effects as are obtained with natural or other synthetic rubber compounds as a result of homogeneity of polymer chain. The first work done by us on carboxyl-containing (carboxylic) rubbers was done in 1954\2-1955. In this work it was shown that polymers of isoprene and of butadiene, copolymers of butadiene with styrene, butadiene with acrylonitrile, and others, which contain small quantities of methacrylic acid (1\2-2 mole %) in the chain, can be vulcanized with oxides of divalent metals to give pure gum and lightly filled compounds characterized by high strength and elasticity, good resistance to heat aging and good cut growth resistance.

Carboxylic Rubbers. II. Properties of Cured Stocks

1959 ◽  
Vol 32 (1) ◽  
pp. 328-336 ◽  
Author(s):  
B. A. Dolgoplosk ◽  
V. N. Reĭkh ◽  
E. I. Tinyakova ◽  
A. E. Kalaus ◽  
Z. A. Koryushenko ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Elastic Properties ◽  
Good Resistance ◽  
Synthetic Rubber ◽  
Rubber Compounds ◽  
Resistance To Heat

Abstract The experimental evidence shows that the mechanical and elastic properties of the carboxylic rubber compounds far exceed those of the synthetic rubber type compounds. Important qualities of gum and lightly filled carboxylic rubber compounds are: good mechanical and elastic properties, high cut growth resistance and good resistance to heat aging. The disadvantage is the tendency of the carboxylic rubber mixtures to scorch. Carboxylic rubbers are of considerable interest for the preparation of general and special purpose rubber compounds.

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