Skip to main content Accessibility help
×
Home

Structural Changes in Glassy Polycarbonate Due to Cyclic Loading

  • Liang Bao Liu (a1), Albert F. Yee (a1), John C. Lewis (a1), Xiaowei Li (a1) and David W. Gidley (a2)...

Abstract

Glassy polycarbonate was subjected to cyclic stresses and the changes in its structure were studied by DSC, positronium annihilation lifetime spectroscopy (PALS), and small and medium angle X-ray scattering. Upon increased exposure to cyclic loading, the enthalpy overshoot near Tg increased in a manner similar to increasing physical aging. However, the “hole” size as revealed by PALS increased, unlike physical aging. SAXS reveals an increase in the short range order and the amplitude of density fluctuation. These results can be explained in a consistent manner. We conclude that mechanical loading does cause changes in the glassy structure.

Copyright

References

Hide All
1. Struik, L.C.E., Physical Aging in Amorphous Polymers and Other Materials. Elsevier Scientific, New York (1978).
2. Stemstein, S.S., Myers, F.A., and Cama, F.C., Ann. NY Acad. Sci., 227, 9499 (1977).
3. Struik, L.C.E., Polymer, 21, 962967(1980).
4. Smith, T.L., Ricco, T., Levita, G., and Moongan, W.K., Plast. Rub. Proc. App., 6, 8184(1985).
5. Bauwens-Crowet, C. and Bauwens, J.C., Polymer, 28, 18631868(1987).
6. McKenna, G.B. and Lee, A., Polym. Eng. and Sci., 30, 431435(1990).
7. Takemori, M. T., Adv. Polym. Sci. 91/92, 263299(1990)
8. Kobayashi, Y., Zheng, W., Meyer, E.F., McGervey, J.D., Jamieson, A.M., and Simha, R., Macromol., 22, 23022306 (1989).
9. Hill, A.J. and Agrawal, C.M., J. of Polym. Sci. Part B: Polym. Phy., 28, 387405(1990).
10. Song, H.H., PhD thesis, University of Cincinnati, 1989.
11. Liu, L.B., Yee, A.F. and Gidley, D.W., ”Effect of Cyclic Stress on Enthalpy Relaxation in Polycarbonate”, submitted to J. Polym. Sci. Polym. Phys. Ed. for publication.
12. Liu, L.B., Gidley, D.W. and Yee, A.F., ”Effect of Cyclic Stress on Structural Changes in Polycarbonate as Probed by Positronium Annihilation Lifetime Spectroscopy”, submitted to J. Polym. Sci. Polym. Phys. Ed. for publication.
13. Liu, L.B., Yee, A.F., Lewis, J.C., and Gidley, D.W., ”Structural Changes in Glassy Polycarbonate Induced by Cyclic Stresses”, manuscript accepted for publication by J. Non-Crystalline Solids.

Structural Changes in Glassy Polycarbonate Due to Cyclic Loading

  • Liang Bao Liu (a1), Albert F. Yee (a1), John C. Lewis (a1), Xiaowei Li (a1) and David W. Gidley (a2)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed