Accession Number : ADA300532

Title :   Space Environmental Effects on Polymeric Materials.

Descriptive Note : Final technical rept. 1 May 86-31 May 87,

Corporate Author : WILLYS MOTORS INC TOLEDO OH

Personal Author(s) : Kiefer, Richard L. ; Orwoll, Robert A.

PDF Url : ADA300532

Report Date : 31 MAY 1987

Pagination or Media Count : 32

Abstract : Polymeric materials that may be exposed on spacecraft to the hostile environment beyond the earth's atmosphere have been subjected to atomic oxygen, electron bombardment, and ultraviolet radiation in terrestrial experiments. Atomic Oxygen: Evidence is presented for the utility of an inexpensive asher for determining the relative susceptibility of organic polymers to atomic oxygen. Kapton, Ultem, P1700 polysulfone, and m-CBB/BIS-A (a specially formulated polymer prepared at NASA-Langley) all eroded at high rates, just as was observed in shuttle experiments. Radiation: Films of Ultem, P1700 polysulfone, and m-CBB/BIS-A were irradiated with 85-keV electrons. The UV/VIS absorbance of Ultem was found to decay with time after irradiation indicating free radical decay. The tensile properties of Ultem began to change only after it had been exposed to 100 Mrads. The effects of dose rate, temperature, and simultaneous vs. sequential electron and UV irradiation were also studied.

Descriptors :   *SPACE ENVIRONMENTS, *MATERIALS, *POLYMERS, SPACECRAFT, ENVIRONMENTS, HIGH RATE, ULTRAVIOLET RADIATION, EXPOSURE(GENERAL), TENSILE PROPERTIES, SEQUENCES, OXYGEN, POLYMERIC FILMS, SPACE SHUTTLES, ORGANIC COMPOUNDS, VISIBLE SPECTRA, IRRADIATION, ELECTRON IRRADIATION, DOSE RATE, EARTH ATMOSPHERE, POLYIMIDE RESINS, POLYSULFONES.

Subject Categories : Laminates and Composite Materials
      Astronautics
      Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE