Journal
POLYMERS FOR ADVANCED TECHNOLOGIES
Volume 25, Issue 1, Pages 9-15Publisher
WILEY-BLACKWELL
DOI: 10.1002/pat.3197
Keywords
PEEK; ion irradiation; cross-linking; dielectric relaxation spectroscopy; 2D correlation spectroscopy
Categories
Ask authors/readers for more resources
This paper reports the first use of temperature-temperature 2D correlation dielectric relaxation spectroscopy (2D COS-DRS) to study the molecular relaxation dynamics in ion-irradiated poly(ether ether ketone) (PEEK). With the help of the high resolution and high sensitivity of 2D COS-DRS, it was possible to locate the position of the motion of water molecules in the dielectric spectrum of PEEK. This occurred at -20 degrees C and increased in intensity on increasing water contents. On irradiation, a new relaxation was observed at -75 degrees C and -85 degrees C for proton and helium ion-irradiated samples, respectively. This increased in intensity on increasing radiation dose and was assigned to main-chain phenyl motions of the cross-linked units of the polymer. 2D COS-DRS was also successfully applied to resolve the overlap in molecular events in the region of glass transition. Three processes that change in different directions with respect to ion irradiation dose were identified. These were at 160 degrees C, 175 degrees C, and 240 degrees C and were assigned to the relaxation, second relaxation, and the onset of conductivity, respectively. In addition, hybrid 2D COS-DRS was used to investigate the effect of the so-called linear energy transfer effect, and the results showed that helium ions were more effective in cross-linking PEEK. Copyright (c) 2013 John Wiley & Sons, Ltd.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available