Accession Number : ADA303050

Title :   Effects of Ionizing Radiation on the Chemical Structure, Crystalline Content and Molecular Weight Distribution of Various Teflon Resins.

Descriptive Note : Doctoral thesis,

Corporate Author : RENSSELAER POLYTECHNIC INST TROY NY DEPT OF NUCLEAR ENGINEERING

Personal Author(s) : Fisher, William K.

PDF Url : ADA303050

Report Date : MAY 1981

Pagination or Media Count : 159

Abstract : Changes in the chemical composition, crystalline content and structure, flow properties and molecular weight distribution in polytetrafluoroethylene (PTFE) after exposure to ionizing radiation are described. The radiation used in this work was 0.8 MeV electrons. The effects of post-irradiation annealing on the chemical composition and crystalline content are also analyzed. Radiation-induced changes in the chemical composition and the role of oxygen and water vapor in these changes was determined by infrared spectroscopy of PTFE irradiated in ambient air, wet and dry oxygen atmosphere and under vacuum. It was found that when the irradiations are carried out in the presence of oxygen, acid fluoride endgroups are formed and that, upon exposure to water vapor, these endgroups undergo hydrolysis to form carboxylic acid endgroups. jg p14

Descriptors :   *MOLECULAR WEIGHT, *CRYSTALS, *CHEMICAL COMPOSITION, *IONIZING RADIATION, *TETRAFLUOROETHYLENE RESINS, ANNEALING, INFRARED SPECTROSCOPY, EXPOSURE(GENERAL), DISTRIBUTION, AIR, POLYMERS, VACUUM, THESES, OXYGEN, MOLECULAR STRUCTURE, FLOW, IRRADIATION, HYDROLYSIS, DRY MATERIALS, FLUORIDES, ATMOSPHERES, WATER VAPOR, CARBOXYLIC ACIDS, RADIATION EFFECTS.

Subject Categories : Plastics
      Radiation and Nuclear Chemistry
      Polymer Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE