Accession Number : ADA309444

Title :   Observations on Permeation of Polytetrafluoroethylene by Compounds of Rhenium, Molybdenum, and Tungsten.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Leibecki, Harold

PDF Url : ADA309444

Report Date : NOV 1968

Pagination or Media Count : 18

Abstract : Observations of diffusion of rhenium molybdenum, and tungsten hexafluorides into PFTE and hydrolysis of the resultant material are reported. Exposure of PTFE and hydrolysis of the resultant material are reported. Exposure to rhenium or molybdenum hexafluoride, followed by hydrolysis, results in impregnation of the plastic with a metal compound. Tungsten hexafluoride was observed to grow a fibrous product (composition unresolved) on the surface of the plastic during ambient air hydrolysis. Rhenuim hexafluoride hydrolysis yielded a mixture of rhenium oxides. The PTFE was investigated for electrical conduction and was found to be substantially more conductive than the pure plastic. The hydrolysis product of molybdenum hexafluoride impregnation was postulated to be a mixture of molybdenum oxides.

Descriptors :   *PERMEABILITY, *TUNGSTEN, *MOLYBDENUM COMPOUNDS, *RHENIUM, METALS, FIBERS, EXPOSURE(GENERAL), AIR, POLYMERS, ELECTRICAL CONDUCTIVITY, MIXTURES, SURFACES, PURITY, OXIDES, DIFFUSION, HYDROLYSIS, PLASTICS, TETRAFLUOROETHYLENE RESINS, IMPREGNATION.

Subject Categories : Polymer Chemistry
      Inorganic Chemistry
      Physical Chemistry
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE