Abstract
Relaxation in largely strained permanent networks is described. With the aid of thermodynamics of irreversible processes a constitutive equation is formulated whereby the equilibrium states of references are given by the van der Waals network strain energy. A key observation is that the shape of the relaxation time spectrum does not depend on the strain, straintype, strain-rate, temperature or pressure. The WLF-regime is typified therewith. “Below” the WLF-regime deformation becomes heterogeneous. Formation of a neck is observed. This process can be described by a universal power law. When the neck is formed relaxation during the stretch shows the same symmetries as in the WLF-regime. Yet, changes of place are, in addition, elastically activated. Stress-strain cycles of poly-methyl-methacrylate (PMMA) can be described even when a neck is formed. Fundamental questions about the nature of the glass transition are discussed.
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© 1994 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG
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Kilian, H.G., Kraus, V. (1994). Relaxation in networks strained in the glass-transition regime. In: Kilian, H.G., Pietralla, M. (eds) Transitions in oligomer and polymer systems. Progress in Colloid & Polymer Science, vol 96. Steinkopff. https://doi.org/10.1007/BFb0115733
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DOI: https://doi.org/10.1007/BFb0115733
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