Positron annihilation lifetime spectroscopy (PALS) was used to study the microstructure of PTFE/silica composites. The positron lifetimes (7,) and intensities (1,) of PTFE and the composites (30-62% silica) were measured at room temperature as a function of specimen thickness. Four lifetime componen
Positron annihilation lifetime study of vapor sorption in polypropylene and polytetrafluoroethylene
✍ Scribed by Victor Sánchez; Rafael López; Luz Alicia Fucugauchi; Yasuo Ito
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 753 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0021-8995
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Transition and relaxation processes of polyethylene (PE), polypropylene (PP), and polystyrene (PS) were studied by the positron annihilation technique. From measurements of lifetime spectra of positrons as a function of temperature, the lifetime of ortho-positronium, t 3 , and its intensity, I 3 , w