Re-evaporation of polymeric materials during outgassing experiments

Details Re-evaporation of polymeric materials during outgassing experiments Re-evaporation of polymeric materials during outgassing experiments

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.540..211l&link_type=abstract

In: Proceedings of the 9th International Symposium on Materials in a Space Environment, 16-20 June 2003, Noordwijk, The Netherla

Computer Science

Performance

Space Environment, Materials, Contamination

Scientific paper

Outgassing occurs when material constituents are volatilised after being placed into a vacuum environment and subjected to heat. It can lead to the degradation of surfaces by deposition of contaminants and thus to a reduction of the performance of the instrument (thermo-optical properties, ageing). High levels of deposition can also result in over-heating or electrostatic discharge. Molecular flux phenomena occur simultaneously during outgassing: when a molecule strikes a surface, it can either be accommodated by the surface or be scattered, elastically or inelastically. Standard test methods give the possibility to estimate the Total Mass Loss from the material and the amount of Collected Volatile Condensable Materials deposited on a cold surface. The purpose of this study is to evaluate the amount of materials that are re-emitted, with the help of an original set-up. Thus, two types of re-emission processes are evaluated: - a time-dependent process, that will be mentioned as "passive re-evaporation" - a temperature-dependent process, or "active re-evaporation".

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