Thermal expansion of irradiated polytetrafluoroethylene

Subrahmanyam, H. N. ; Subramanyam, S. V. (1987) Thermal expansion of irradiated polytetrafluoroethylene Journal of Polymer Science Part B: Polymer Physics, 25 (7). pp. 1549-1556. ISSN 0887-6266

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The thermal expansion coefficient of gamma-irradiated Polytetrafluoroethylene (PTFE) has been measured in the temperature range 80-340 K by using a three-terminal capacitance technique. The samples are irradiated in air at room temperature with gamma rays from a Co60 source at a dose rate of 0.26 Mrad/h. The change in crystallinity is measured by an X-ray technique. The expansion coefficient is found to increase with radiation dose below 140 K owing to the predominant effect of degradation. Above 140 K, the expansion coefficient is found to decrease with radiation dose because of the enhanced crystallinity. The temperatures of the two first-order phase transitions are also found to shift to lower temperatures owing to degradation of PTFE.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
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Deposited On:28 Jul 2011 14:37
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