Some remarks on the relation between free-volume fractions and ortho-positronium lifetimes in amorphous polymers

Radiation Physics and Chemistry

Volumn 58, Issue 5-6, 2000, Pages 509-512

  Maurer, Frans H J ^a,b   Schmidt, Marcus ^b  

^a LUND INSTITUTE OF TECHNOLOGY   (Sweden)

^b CHALMERS UNIVERSITY OF TECHNOLOGY   (Sweden)

Author keywords

[No Author keywords available]

Indexed keywords

AMORPHOUS MATERIALS; EQUATIONS OF STATE; GLASS TRANSITION; ORGANIC POLYMERS; POLYMETHYL METHACRYLATES; PRESSURE MEASUREMENT; SPECTROSCOPY; TEMPERATURE CONTROL; TEMPERATURE MEASUREMENT; VOLUME FRACTION; VOLUME MEASUREMENT;

AMORPHOUS POLYMERS; FREE VOLUME FRACTION; ORTHOPOSITRONIUM; POSITRON ANNIHILATION LIFETIME; PRESSURE VOLUME TEMPERATURE; SIMHA-SOMCYNSKY EQUATION OF STATE;

POSITRONS;

POLY(METHYL METHACRYLATE); POLYMER; POLYSTYRENE;

CHEMICAL STRUCTURE; CONFERENCE PAPER; DESTRUCTION; LIFESPAN; PHYSICAL CHEMISTRY; POSITRON; POSITRONIUM; PRESSURE; PROBABILITY; RADIOCHEMISTRY; TECHNIQUE; TEMPERATURE;

EID: 0034212860     PISSN: 0969806X     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0969-806X(00)00208-5     Document Type: Conference Paper

References (23)

1. Eldrup M., Lightbody D., Sherwood J.N. The temperature dependence of positron lifetimes in solid pivalic acid. Chem. Phys. 63:1981;51.
2. Gregory R.B. Free-volume and pore size distributions determined by numerical Laplace inversion of positron annihilation lifetime data. J. Appl. Phys. 70:1991;4665.
3. Higuchi H., Yu Z., Jamieson A.M., Simha R., McGervey J.D. Thermal history and temperature dependence of viscoelastic properties of polymer glasses: relation to free volume quantities. J. Polym. Sci. Part B: Polym. Phys. 33:1995;2295.
4. Hirade, T., Maurer, F.H.J., Eldrup, M., 2000. Effects of visible light on positronium formation in polymers at low temperature studied by PAL and ESR. J. Chem. Phys. submitted.
5. Kindl P., Reiter G. Investigation on the low-temperature transitions and time effects of branched polythylene by the positron lifetime techinque. Phys. Status Solidi, A. 104:1987;707.
6. Kobayashi Y., Wang C.L., Hirata K.M, Zheng W., Zhang C. Effects of composition and external electric field on positronium formation in a polymer blend system. Phys. Rev. B: Condens. Matter Matr. Phys. 58:1998;5384.
7. Kobayashi Y., Zheng W., Meyer E.F., McGervey J., Jamieson A. Free volume and physical aging of poly (vinyl acetate) studied by positron annihilation. Macromolecules. 22:1989;2302.
8. Nakanishi H., Jean Y.C. Positrons and positronium in liquids. Schrader D.M., Yean Y.C. Positron and Positronium Chemistry. Vol. 57:1988;159 Elsevier, Amsterdam.
9. Okamoto K., Tanaka K., Katsube M., Kita H., Sueoka O., Ito Y. Correlation between positron annihilation and gas diffusion properties of various rubbery polymers. Polymer Journal. 25:1993;275.
10. Okamoto K., Tanaka K., Katsube M., Kita H., Ito Y. Free volume holes of rubbery polymers probed by positron annihilation. Bull. Chem. Soc. Jpn. 66:1993;61.
11. Schmidt, M., Brodin, A., Jacobsson, P., Maurer, F.H.J., 2000. Quasielastic Raman scattering and free-volume in isotropic pressure-densified atactic poly (methyl methacrylate) glasses. J. Chem. Phys. 112, 1020.
12. Schmidt, M., Maurer, F.H.J., 2000. Isotropic pressure-densified atacitc poly(methyl methacrylate) glasses: free volume properties from equation-of-state data and positron annihilation lifetime spectroscopy. Macromolecules accepted.
13. Shukla A., Peter M., Hoffmann L. Analysis of positron lifetime spectra using quantified maximum entropy and a general linear filter. Nucl. Instr. and Meth. A. 335:1993;310.
14. Simha R., Carri G. Free volume, hole theory and thermal properties. J. Polym. Sci. Part B: Polym. Phys. 32:1994;2645.
15. Simha R., Somcynsky T. On the statistical thermodynamics of spherical and chain molecule fluids. Macromolecules. 2:1969;342.
16. 2 in glassy polymers. Polymer Journal, 25:1993;577.
17. Tao S.J. Positron annihilation in molecular substances. J. Chem. Phys. 56:1972;5499.
18. Wang C.L., Hirade T., Maurer F.H.J., Eldrup M., Pedersen N.J. Free-volume distribution and positronium formation in amorphous polymers: Temperature and positron-irradiation-time dependence. J. Chem. Phys. 108:1998;1.
19. Wang C.L., Maurer F.H.J. New approach to determine ortho-positronium lifetime distributions in polymers: a comparison between maximum entropy and the numerical Laplace inversion methods. Macromolecules. 29:1996;8249.
20. Welander M., Maurer F.H.J. Decrease in o-Ps formation in polymers during positron lifetime measurements. Mater Sci. Forum. 105-110:1992;1811.
21. Wästlund C., Maurer F.H.J. Positron lifetime distribution in polymers determined with the maximum entropy method. Nucl. Instr. and Meth. B. 117:1996;467.
22. Wästlund C., Maurer F.H.J. Free-volume properties of styrene-maleic anhydride and styrene-acrylonitrile copolymers. Polymer. 39:1998;2897.
23. Yu Z., Yahsi U., McGervey J.D., Jamieson A.M., Simha R. Molecular weight-dependence of free-volume in polystyrene studied by positron annihilation measurements. J. Polym. Sci. Part B: Polym. Phys. 32:1994;2637.