Despite the fact that pure hydrocarbon rubbers intrinsically absorb very little water (less than 1 part in 1000), most rubber vulcanizates will, in time, absorb several per cent. Also, although the diffusion coefficient of a molecule the size of water is fairly high, the time to reach an equilibrium water uptake is much greater than would be expected on this basis. Both these effects are believed to be due to the presence of small amounts of hydrophilic impurities in the rubber. To test this hypothesis, model experiments using known amounts of a hydrophilic impurity (sodium chloride) in a pure rubber were carried out and a theory developed to explain both the amount and the rate of water uptake.

Media Info

  • Features: References;
  • Pagination: 6p.

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Filing Info

  • Accession Number: 00648725
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM