Abstract
The irradiation temperature effect on polytetrafluoroethylene (PTFE) was investigated by tensile test and thermal analysis. The behavior of mechanical properties and changes of crystallinity on irradiation indicated the network formation in PTFE molecules by radiation induced crosslinking under oxygen-free atmosphere in the molten state around 613K. The radiation resistance of PTFE was much improved by crosslinking, that is, the irradiation dose at a half value of ultimate elongation was about 1MGy for 500kGy-crosslinked PTFE, while the dose for non-crosslinked PTFE was only 3.5kGy, so it is expected that the crosslinked PTFE can be applied for the nuclear facilities with relatively high radiation environment. Also, the crosslinked PTFE had light transparency due to the decrease of crystallites, and held the electrical insulation and heat resistance. The abrasion factor in frictional test was greatly improved by crosslinking.
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