Abstract
Abstract Several years ago the Phillips Petroleum Company initiated a study of the properties of hydrogenated synthetic elastomers. The result of this investigation has been the development of a series of thermoplastic hydrogenated polymers, Hydropols, which have certain unusual properties not found in other available plastics. Prior to this investigation, little was known about hydrogenated synthetic elastomers. The hydrogenation of natural rubber had been fairly well investigated since Berthelot heated rubber with concentrated hydriodic acid in a bomb tube and obtained a mixture of high boiling paraffins. Harries stimulated the work of Staudinger and Fritschi and Pummerer and Burkard by his statement, “It would be of great importance to be able to carry out the reduction of rubber, because hydrorubber probably distills unchanged in a high vacuum, and therefore its constitution could be determined for certain.” This hydrogenation of rubber was simultaneously accomplished in 1922 by Staudinger and Fritschi using a platinum catalyst dispersed in purified rubber at 270° C and 93 atmospheres of hydrogen pressure for 10 hours, and by Pummerer and Burkard using dilute solutions of depolymerized rubber in methylcyclohexane with a platinum catalyst at ordinary temperatures and atmospheric pressures.
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