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Nanoindentation Measurements of Mechanical Properties of Polystyrene Thin Films

  • Min Li (a1), C. Barry Carter (a1) and William W. Gerberich (a1)


The elastic modulus and work of adhesion of thin polystyrene (PS) films have been evaluated from nanoindentation load-displacement curves. The modulus was calculated using two methods: an unloading stiffness analysis and an elastoplastic unloading analysis. Results indicate that the latter analysis gives better modulus evaluation for the polymers. Two methods were also utilized in determining the work of adhesion, one using the pull-off forces and one using the displacement difference at zero force and pull-off force. The values given by the two methods are close. The effects of surface roughness and maximum load on the adhesion measurements are discussed. Different molecular weights were also chosen to compare the characteristics of the polymers during use under the same conditions. No significant difference in either modulus or adhesion energy was shown between the PSs of very low, moderate, and high molecular weights at room temperature.



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1. Doerner, M. F. and Nix, W. D., J. Mater. Res. 1, 601 (1986).
2. Oliver, W. C. and Pharr, G. M., J. Mater. Res. 7, 1564 (1992).
3. Gerberich, W. W., Yu, W., Kramer, D., Strojny, A., Bahr, D., Lilleodden, E., and Nelson, J., J. Mater. Res. 13, 421 (1998).
4. Johnson, K. L., Kendall, K., and Roberts, A. D., Proc. R. Soc. Lond. A 324, 301 (1971).
5. Fox, T. G. and Flory, P. J., J. Appl. Phys. 21, 581 (1950).
6. Nielsen, L. E. and Landel, R. F., Mechanical Properties of Polymers and Composites (Marcel Dekker, Inc., New York, 1994), p. 18.
7. Bushan, B., Kulkarni, A. V., Bonin, W. A., and Wyrobek, T., Phil. Mag. A 74, 1117 (1996).
8. Polymer Handbook; edited by Brandrup, J. and Immergut, E. H. (Wiley-Interscience, New York, 1989), p. V/91.
9. Xia, X., Ph.D. Thesis, University of Minnesota, 2000.
10. Creton, C., Brown, H. R., and Shull, K. R., Macromolecules 27, 3174 (1994).
11. Falsafi, A., Deprez, P., Bates, F. S., and Tirrell, M., J. Rheology 41, 1349 (1998).
12. Li, J. C. M., Submitted to J. Mat. Sci. Eng. A (2000).
13. Johnson, K. L., Contact Mechanics (Cambridge University Press, Cambridge, 1987), p. 405421.
14. Luengo, G., Pan, J., Heuberger, M., and Israelachvili, J. N., Langmuir 14, 3873 (1998).
15. LeGrand, D. G. and Gaines, G. L. Jr., J. Colloid Interface Sci. 31, 162 (1969).
16. Wu, S., J. Macromol. Sci. Rev. Macromol. Chem. C10, 1 (1974).

Nanoindentation Measurements of Mechanical Properties of Polystyrene Thin Films

  • Min Li (a1), C. Barry Carter (a1) and William W. Gerberich (a1)


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