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- W2003134611 abstract "4-(3,5-dioxo-1,2,4-triazolidin-4-yl) benzole (U4A) or -isophthalic acid (U35A) units randomly attached to a polybutadiene backbone form extended supramolecular hydrogen bond assemblies, which act as effective junction zones in unusual thermoreversible elastomer networks. The relaxation behavior of stress and the segmental orientation induced after a sudden strain, has been investigated by means of step-strain experiments and 2H-NMR spectroscopy. The stress relaxation behavior can be described as a two-step process in which the first step is very sensitive to the stability of the supramolecular aggregates. About 20 s after reaching the initial strain, stress is reduced to a value comparable to the yield-stress in stress-strain cycles. The long-time relaxation behavior is interpreted as a reduction of the effective cross-link density due to a gradual breakdown of the hydrogen bond clusters. The relaxation data of the functionalized polybutadienes can be superimposed to give master curves, which are characteristic for the type of junction zone. The degree of aggregate degradation is estimated as a function of the initial stress. In the same type of step-strain experiment, the 2H-NMR spectra show a decay of the line splitting as well as a change in the complete lineshape." @default.
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- W2003134611 date "1997-01-01" @default.
- W2003134611 modified "2023-10-14" @default.
- W2003134611 title "Relaxation of stress and orientation in thermo-reversible networks" @default.
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- W2003134611 doi "https://doi.org/10.1016/s0966-7822(96)00030-5" @default.
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