Influence of low temperature on the free volume in polyethylene by positron annihilation

• Autorzy: Osoba W.
• Języki publikacji: EN

Abstrakty

EN

Positron lifetime measurements were performed as a function of temperature in thermo-shrunken, modified polyethylene. Mean volume of free volume cavities in the investigated polymer was estimated from the results of the measurements. This mean volume turned out to be a smooth function of temperature (from room temperature to 8.5 K). The effect of trapping of free electrons, produced during positron irradiation, was observed at lowered temperature.

Słowa kluczowe

EN

positron annihilation; polymers; free volume

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2010
• Tom: Vol. 55, No. 1
• Strony: 69--72
• Opis fizyczny: Bibliogr. 15 poz., rys.

Twórcy

autor

Osoba W.

• Institute of Physics, University of Silesia, 4 Uniwersytecka Str., 40-007 Katowice, Poland, Tel.: [phone], Fax: [phone],

Bibliografia

• 1. Balcaen N, de Baerdemaeker J, Dauwe C, Cosaert K, Goethals E, du Prez F (2000) Composition and self--irradiation effects on the positron annihilation lifetime properties of poly(ethylene-co-vinyl acetate). Radiat Phys Chem 58:497–501
• 2. Chen Z, Suzuki T, Uedono A, Tanigawa S, Ito Y (2001) Temperature and irradiation effects on positronium formation in polycarbonate. Mater Sci Forum 363/365:297–299
• 3. Danch A, Osoba W, Wawryszczuk J (2007) Comparison of the influence of low temperature and high pressure on the free volume in polymethylpentene. Radiat Phys Chem 76:150–152
• 4. Danch A, Osoba W, Wawryszczuk J (2008) Influence of temperature and pressure on the free volume in thermo--shrunken polyethylene by positron annihilation. Acta Phys Pol A 113;5:1307–1313
• 5. Eldrup M, Lightbody D, Sherwood J (1981) The temperature dependence of positron lifetimes in solid pivalic acid. Chem Phys 63:51–58
• 6. He C, Suzuki T, Ma L et al. (2002) Molecular motions at low temperature observed by positron annihilation. Phys Lett A 304:49–53
• 7. Hirade T, Maurer FHJ, Eldrup M (2000) Positronium formation at low temperature: the role of trapped electrons. Radiat Phys Chem 58:465–471
• 8. Jean Y (1990) Positron annihilation spectroscopy for chemical analysis. Microchem J 42:72–102
• 9. Keyser R, Tsuji K, Williams F (1972) Chapter 9. In: Dole M (ed) The radiation chemistry of macromolecules. Academic Press, New York
• 10. Kirkegaard P, Olsen JV, Eldrup M, Pedersen NJ (2009) PALSfit: a computer program for analysing positron lifetime spectra. Risø-R-1652(EN), pp 1–43
• 11. Mallon PE (2003) Application to polymers. In: Jean YC, Mallon PE, Schrader DM (eds) Principles and application of positron & positronium chemistry. World Scientific, New Jersey, pp 253–280
• 12. Nahid F, Beling CD, Fung S (2007) Temperature dependence study of positronium formation in high density polyethylene by positronium annihilation lifetime spectroscopy. Phys Status Solidi C 4:3751–3754
• 13. Reiter G, Kindl P (1990) Positron lifetime investigations on linear polyethylene compared to branched polyethylene. Phys Status Solidi A 118:161–168
• 14. Tao S (1972) Positronium annihilation in molecular substances. J Chem Phys 56:5499–5510
• 15. Zrubcová J, Krištiak J, Pedersen W, Pedersen N, Eldrup M (2001) Light effects on positronium formation in polymers. Mater Sci Forum 363/365:359–361