Hostname: page-component-5c6d5d7d68-txr5j Total loading time: 0 Render date: 2024-08-16T18:26:59.648Z Has data issue: false hasContentIssue false
  • English
  • Français

Physical Aging and Isothermal Relaxation in Glassy Polycarbonate Measured by Positron Annihilation Lifetime Spectroscopy

Published online by Cambridge University Press:  16 February 2011

A. J. Hill  and
P. L. Jones
A. J. Hill
Affiliation:
Department of Materials Engineering, Monash University, Clayton, Victoria, 3168Australia.
P. L. Jones
Affiliation:
Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27706.
Get access

Abstract

The free volume behaviour of polycarbonates annealed above and below the glass transition temperature, Tg, is studied. The free volume behaviour as a function of temperature and as a function of time during isothermal relaxation is compared for the different heat treatments. The relaxations which occur during contraction experiments performed after cooling from the heat treatment temperature result in a decrease in free volume for both sets of samples; however, the general decrease is much greater in the polycarbonate annealed below Tg. For the polycarbonate annealed below Tg, the free volume is partially recoverable if the samples are reheated to the original annealing temperature. Differences in the free volume relaxation behaviour during contraction experiments are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 215: Symposium R2 – Structure, Relaxation and Physical Aging of Glassy Polymers , 1990 , 175
Copyright
Copyright © Materials Research Society 1991

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Struik, L.C.E., Physical Aging in Amorphous Polymers and Other Materials. (Elsevier, Amsterdam, 1978).Google Scholar
2. Golden, J.H., Hammant, B.L., and Hazell, E.A., J. Appl. Polym. Sci. 11, 1571 (1967).CrossRefGoogle Scholar
3. Goodwin, A.A. and Hay, J.N., Polym. Comm. 31, 338 (1990).Google Scholar
4. (a) Victor, J.G. and Torkelson, J.M., Macromolecules 21, 3490 (1988).CrossRefGoogle Scholar
(b) Royal, J. S. and Torkelson, J. M., this proceedings.Google Scholar
5. McGervey, J., Panigrahi, N., Simha, R., and Jamieson, A. in Positron Annihilation. edited by Jain, P.C., Singru, R.M. and Gopinathan, K.P. (World Scientific, Singapore 1985) p. 690.Google Scholar
6. Hill, A.J., Jones, P.L., Lind, J.H., and Pearsall, G.W., J. Polym. Sci, Polym. Chem. Ed. 26, 1541 (1988).Google Scholar
7. Hill, A.J., Heater, K.J., and Agrawal, C.M., J. Polym. Sci., Polym. Phys. Ed. 28, 387 (1990).Google Scholar
8. Kobayashi, Y., Zheng, W., Meyer, E.F., McGervey, J.D., Jamieson, A. M., and Simha, R., Macromolecules 22, 2303 (1989).Google Scholar
9. Sandreczki, T. C., Nakanishi, H., and Jean, Y. C. in Proc. of Int, Symp. in Positron Annihilation Studies of Fluids, edited by Sharma, S. C. (World Scientific, New York, 1988) p. 200.Google Scholar
10. Hill, A.J. and Agrawal, C. M., J. Mater. Sci., in press.Google Scholar
11. (a) Jean, Y. C., Microchem. J. 42, 72 (1990).Google Scholar
(b) Schrader, D.M. and Jean, Y. C. editors, Position and Positronium Chemistry.; Studies in Physical and Theoretical Chemistry, 57 (Elsevier, New York, 1988).Google Scholar
(c) Jean, Y.C., this proceedings.Google Scholar
12. Heater, K.J., M.S. thesis, Duke University, 1989.Google Scholar
13. Smith, T.L., Levita, G., and Moonan, W.K., J. Polym. Sci., Polym. Phys. Ed. 26, 875 (1988).Google Scholar
14. Narayanswamy, O.S., J. Amer. Ceram. Soc. 54, 491 (1971).CrossRefGoogle Scholar
15. (a) Ngai, K.L., Comments Solid State Phys. 2, 127 (1979); 2,141 (1980).Google Scholar
(b) Plazek, D.J., Ngai, K.L., and Rendell, R.W., Polym. Engr. Sci. 24, 1111 (1984).Google Scholar
(c) Rendell, R. W. and Ngai, K. L., this proceedings.Google Scholar
16. Hodge, I. M., Macromolecules 16, 898 (1983).Google Scholar