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Sorption behaviour and swelling of polymers in a carbon dioxide atmosphere at transcritical conditions.

Author(s) : EGGERS R.

Summary

Considering the sealing of moving and unmoving components and assemblies in refrigerating plants using carbon dioxide as a refrigerant it is important to know that small carbon dioxide molecules can diffuse into polymers. The carbon dioxide accumulates in the polymer which leads to swelling. Additionally, the seals strained at supercritical pressure can be destroyed by an explosive decompression. The sorption of carbon dioxide into the seal can be superposed by a release of oligomers, binding agents or polymer plasticiser. The transport effects of carbon dioxide diffusing into polymers and the developing sorption equilibrium will be presented in this article. The experimental examination of the sorption kinetics is done at transcritical conditions in a high pressure magnetic suspension balance. The development of the swellings can be observed in a high pressure view cell. The different interactions are clarified at the example of two different polymers.

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Pages: 2006-2

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Details

  • Original title: Sorption behaviour and swelling of polymers in a carbon dioxide atmosphere at transcritical conditions.
  • Record ID : 2008-0050
  • Languages: English
  • Source: 7th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2006). Proceedings
  • Publication date: 2006/05/29

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