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| Titel: |
Large Amplitude Cyclic Deformation of a Crosslinked Epoxy Resin in the Transition Zone |
| Auteur: |
Isayev, A. I. Katz, D. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 8 (1980) nr. 1 pagina's 25-43 |
| Jaar: |
1980-06-01 |
| Inhoud: |
Absolute values of complex dynamic shear modulus at different frequencies and deformation amplitudes in the transition zone from glassy state to rubbery state were measured for an epoxy resin cured with diethylenetriamine. A sharp decrease of the modulus, truncation of the glassy state region and shifting of the transition zone to lower temperatures have been observed as an effect of large amplitude deformations above certain critical values. The maximum in the modulus values decrease and the minimum of the critical amplitude both take place at glass transition temperature. The values of the maximum and the minimum, as well as the temperature when they occur, depend upon frequency. The transition temperature, determined by the point of intersection of straight lines which express the modulus temperature relation in the glassy state and in the transition zone, can be frequency independent at large deformation amplitudes, contrary to the known behavior of the polymers at small deformation amplitudes. The time required for obtaining the modulus equilibrium value at a given deformation frequency and amplitude was measured. This period decreases by more than three orders of magnitude with the increase of temperature within the transition zone. The observed modulus decrease seems to be due mainly to thixotropic nature of the investigated polymer. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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