IX.—On the oxidation of India rubber

The oxidation mechanism of rubber and gutta-percha hydrocarbons has been studied. Rubber hydrocarbon in sheet form oxidizes more slowly and less completely than precipitated gutta-percha, which is believed to be due to the smaller surface exposure of the former material. Gutta-percha hydrocarbon in finely divided form oxidizes to a fairly definite degree in oxygen at room temperature, corresponding to a weight increase of about 38 per cent. The length of the autocatalytic induction periods for rubber and gutta-percha varies over a wide range and is shortened by heating the hydrocarbon in high vacuum before•oxidation and by exposure to light.The rate of oxidation of gutta-percha in air, as compared with oxygen, is reduced in proportion to the oxygen concentration, and the induction period is correspondingly increased.Carbon dioxide, water, formic acid, and formaldehyde

Section: Previous Workmentioning

confidence: 99%

Oxidation Studies of Rubber, Gutta-Percha, and Balata Hydrocarbons¹

Kemp¹,

Bishop²,

Lasselle³

1931

“…Vulcanized rubber on standing in the air usually shows a deterioration of physical properties (57), and this is accentuated by vulcanizing beyond the point of optimum cure. The ability of rubber to resist this deterioration may be improved, however, by the use of antioxidants (36), which are apparently negative catalysts of oxidation.…”

Section: Phenomena Of Vulcanizationmentioning

confidence: 99%

IV—A Theory of Vulcanization of Rubber

Boggs¹,

Blake²

1930

“…Oxygen Aging-The test using compressed oxygen, either hot or cold, has aroused considerable interest in the last few years. The harmful action of oxygen on rubber ivas recognized as early as the middle of last century (1, 3, 4, 7, 9, 10,11,18,21,22). In an earlier series of the publications (15) the writers have shown that the changes caused by oxygen in organic substances are of two distinct kinds: one is of an ordinary chemical nature, the other, catalytic.…”

mentioning

confidence: 99%

Aging of Rubber and Its Retardation by the Surface Application of Antioxygens¹Diffusion Process

Moureu¹,

Dufraisse²,

Lotte³

1930

deterioration of rubber may be due to any one or a combination of a large number of factors, such as oxidation, depolymerization, continued vulcanization, action of heat or light, and so on. The present paper will deal with the preservative action of antioxygens (12,15) when applied on the surface of articles, and with some general remarks on the use of antioxvgens. Comparison of Accelerated Aging TestsThe only test not open to criticism is one which measures the aging of an article under actual service conditions and the writers used it in many control experiments. This test has the disadvantage of consuming an excessive amount of time and of not being suitable for a series of studies. Hence