Hostname: page-component-cd9895bd7-gbm5v Total loading time: 0 Render date: 2024-12-27T02:11:16.605Z Has data issue: false hasContentIssue false
  • English
  • Français

The Effect of Crosslink Density and Complex Fields of Stresses on the Network Chain Mobility of Model Epoxy Resins

Published online by Cambridge University Press:  15 February 2011

Samuel Bron  and
Dov Katz
Samuel Bron
Affiliation:
Department of Chemistry, Rutgers - The State University of New Jersey, Busch Campus, Piscataway, NJ 08855-0939, USA
Dov Katz
Affiliation:
Department of Materials Engineering, Technion - Israel Institute of Technology, Technion City, Haifa 32000, Israel
Get access

Abstract

The viscoelastic properties of model epoxy resins were investigated using a tensile stress relaxation technique. Simultaneously with the applied tensile strain, the specimens were subjected to torsional oscillations in a specially designed instrument. The crosslinking density of the resins was controlled by the length of the aliphatic chain of the diamine hardener. Smooth master curves were obtained by Computed Aided Superposition (CAS) using a software written especially for this work. The shape of the master curves changed significantly as a function of the frequency of torsional oscillations. Based on previously published data, as well as on pertinent information from literature, it was concluded that the variations in the shape of the master curves reflect corresponding changes in the spectrum of relaxation times of the investigated resins. It is suggested that the observed phenomena are caused by physical processes, such as short-range orientation and physical aging, which lead to densification of the network and a corresponding increase in its stiffness.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 304: Symposium H – Polymer/Inorganic Interfaces , 1993 , 61
Copyright
Copyright © Materials Research Society 1993

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. Bron, S. and Katz, D., A morphological study of the interphase in epoxy-based adhesive joints, 16th Annual Meeting of the Adhesion Society and the International Symposium on the Interphase, February 21–26, 1993, Williamsburg, Virginia, edited by Boerio, F. J., The Adhesion Society, Inc., 1993, pp. 169.Google Scholar
2. Sottos, N. R. and Li, L., The effects of interphase properties on interfacial shear strength in polymer matrix composites, 16th Annual Meeting of the Adhesion Society and the International Symposium on the Interphase, February 21–26, 1993, Williamsburg, Virginia, edited by Boerio, F. J., The Adhesion Society, Inc., 1993, pp. 177.Google Scholar
3. Zanni-Deffarges, M. P. and Shanahan, M. E. R., Interfacial area of aged structural joints, 16th Annual Meeting of the Adhesion Society and the International Symposium on the Interphase, February 21–26, 1993, Williamsburg, Virginia, edited by Boerio, F. J., The Adhesion Society, Inc., 1993, pp. 196.Google Scholar
4. Spiegel, B. and Roy, S., Comparison of the adhesive shear modulus in bulk and bonded states, 16th Annual Meeting of the Adhesion Society and the International Symposium on the Interphase, February 21–26, 1993, Williamsburg, Virginia, edited by Boerio, F. J., The Adhesion Society, Inc., 1993, pp. 430.Google Scholar
5. Fabulyak, F. G. and Lipatov, Y. S., Polym. Sci. USSR, 12, 831 (1970).CrossRefGoogle Scholar
6. Lipatov, Y. S., Shifrin, V. V. and Fabulyak, F. G., Polymer Sci. USSR, 18, 871 (1976).Google Scholar
7. Knollman, G. C. and Hartog, J. J., J. AppI. Phys., 53, 1516 (1982).CrossRefGoogle Scholar
8. Katz, D. and Bron, S., J. Mater. Sci., 26,4733 (1991).Google Scholar
9. Bron, S. and Katz, D., Adhesion, J., in press (1993).Google Scholar
10. Bron, S. and Katz, D., Adhesion, J., submitted, (1993).Google Scholar
11. Lee, A. and McKenna, G. B., Polymer, 31,423 (1990).Google Scholar
12. Crowson, R. J. and Arridge, R. G. C., Polymer, 20,737 (1979).Google Scholar
13. Smith, T. L., J. Polym. Sci., Part C., 35, 39 (1971).Google Scholar
14. Plazek, D. J. and Choy, I.-C., J.Polym.Sci., Part B: Polym.Phys., 27, 307 (1989).CrossRefGoogle Scholar
15. Kelley, F. N., Morton, M. and Plazek, D. J., AFOSR-TR-86-0695, 1986.Google Scholar