Accession Number : ADA309464

Title :   Visual Appearance of Polymeric Contamination.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION GREENBELT MD GODDARD SPACE FLIG HT CENTER

Personal Author(s) : Shapiro, Harold

PDF Url : ADA309464

Report Date : JUN 1970

Pagination or Media Count : 16

Abstract : This paper presents a series of photomicrographs which shows the condensate that a selected group of polymers might have if they were present as spacecraft contaminants. Nine classes of polymeric materials were subjected to temperature and vacuum conditions, and, using microscopic techniques, the condensed effluents were observed. Outgassing data are presented for some materials in the form of weight loss. Photographic material is presented for seven classes; however, for the remaining two classes, the techniques appeared inapplicable. The concept that the appearance of condensate might be unique for each class of polymer is of limited value. The condensate pattern varied as a function of the temperature of the base material for all except one of the seven classes that were photographed. The similarity in the patterns of several classes of polymers makes identification of a particular species problematic.

Descriptors :   *POLYMERS, *CONTAMINANTS, *PLASTICS, *CONDENSATION, SPACECRAFT, POLYSTYRENE, METHACRYLATES, POLYURETHANE RESINS, EPOXY RESINS, POLYIMIDE PLASTICS, POLYETHYLENE, OUTGASSING, POLYVINYL CHLORIDE, PHOTOMICROGRAPHY, POLYETHYLENE TEREPHTHALATE.

Subject Categories : Plastics
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE