D Lin and S J Wang 1992 J. Phys.: Condens. Matter 4 3331 doi:10.1088/0953-8984/4/12/024
D Lin and S J Wang
Show affiliationsTwo kinds of polyethylene samples, low-density polyethylene and high-density polyethylene, have been studied using positron lifetime measurements in the temperature range from 96 to 370 K. Glass transitions and other secondary transitions are observed and the glass transition temperatures are determined. It has been found that the orthopositronium lifetime and its intensity are sensitive to the transitions and the number of free-volume holes reaches a minimum near the glass transition temperature Tg. The molecular motions, the structural transitions and the crystallinity effects are discussed in terms of the properties of the free volume.
64.70.P- Glass transitions of specific systems
61.80.Fe Electron and positron radiation effects
Soft matter, liquids and polymers
Issue 12 (23 March 1992)
D Lin and S J Wang 1992 J. Phys.: Condens. Matter 4 3331
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