On the annihilation rate of thermalised free positrons in gases
β Scribed by G.R. Heyland; M. Charlton; S.A. Davies; T.C. Griffith
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 386 KB
- Volume
- 119
- Category
- Article
- ISSN
- 0375-9601
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Ah&met-The method of positron annihilation was used to study changes of free volume in polycarbonate. Annealing at 180Β°C and pressure 808 MPa causes significant changes of free volume (-23%) compared to nonannealed polycarbonate. The free volume compressibility was estimated to be -3.10-' MPa-'. The
Positron annihilation lifetime (PAL) measurements are reported on a series of chemically different cured epoxy resin systems. Analysis of PAL data yields indicates the effects of changes in the cure temperature and chemical structure on the average molecular free volume size. A comparison of PAL wit