Abstract
AbstractDynamic mechanical studies of polytetrafluoroethylene, subjected to a total reactor radiation dose of about 108 rads, have shown that a decrease occurs in the height of the three damping peaks which are observed in unirradiated samples near 200, 300, and 400°K. Since the 200°K. and 400°K. peaks are associated with configurational changes in the amorphous regions of the material, the experimental observations are compatible with an increased degree of crystallinity. The effects observed in the dynamic modulus–temperature relation upon irradiation are consistent with those found in the internal friction spectrum. The changes that occur in degree of crystallinity upon irradiation have been studied by both infrared and density measurements, and an increase in crystallinity has been found. The changes in the dynamic mechanical properties in the vicinity of room temperature are not well understood, but possible reasons for the observed behavior are given.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
