Nuclear Magnetic Resonance Absorption of Polytetrafluoro-ethylene γ-Irradiated at High Temperatures

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概要

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• The NMR spectra of PTFE irradiated at various temperatures with a dose of 1.1×10^7 R and irradiated at 340℃ with various doses were measured over the temperature range from -50℃ to 50℃. In the case of PTFE irradiated with 1.1×10^7 R, the percent crystallinity estimated from NMR spectra increased with increasing irradiation temperature up to about 300℃, but decreased abruptly above 320℃, and increased again. In the case of PTFE irradiated at 340℃, the crystalline transition temperature was shifted to a lower temperature at 1.1×10^7 R and the NMR line shape changed into a single component at 1.1×10^8 R. The crystal imperfections due to irradiation at 340℃ were caused by high viscosity during irradiation, occlusion of low molecular degradation products, the low degree of chain fractures and probably by the structure changes such as branches, crosslinkings, etc.

• 社団法人応用物理学会の論文
• 1972-10-05

著者

• TUTIYA Mituaki

  Tokyo Metropolitan Institute for Radiological Research

関連論文

• The Effect of Post-Irradiation Heat Treatment on Polytetra-fluoroethylene
• Nuclear Magnetic Resonance Absorption of Polytetrafluoro-ethylene γ-Irradiated at High Temperatures
• NMR Measurements on ^Co γ-Ray Irradiated Polytetrafluoroethylene with High Radiation Doses
• NMR Absorption of Polytetrafluoroethylene Sintered after Irradiation
• White Residue Released from Irradiated Polytetrafluoroethylene by Heat-Treatment
• The NMR Line Width in the Irradiated Polytetrafluoroethylene

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