Summary
Stress-relaxation, creep and stress-strain relations are discussed in terms of pseudo cross-link concept. The decrease of cross-links by the stress or strain leads to an equation similar to the Mooney-Rivlin equation. Viscous flow is also an important factor decreasing the cross-sectional area of the specimen and the chain-extension. Viscosity much decreases with increasing rate of extension and temperature. Filler ingredient plays roles of not only enchancing the chain strain but also providing the pseudo cross-link due to adsorption of the rubber on the filler surface.
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References
Flory, P.J., “Principle of Polymer Chemistry”, Cornell University Press 1953
Rivlin, R.S., Phil. Trans. Roy, Soc. London, Ser A, 241, 379 (1948)
Furukawa, J., Okamoto, H. and Inagaki, S., Kautschuk u Gummi Kunststoffe, Heft 12, 29, 744 (1976)
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Furukawa, J. Theory of pseudo cross-link. Polymer Bulletin 10, 336–342 (1983). https://doi.org/10.1007/BF00281945
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DOI: https://doi.org/10.1007/BF00281945