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- W2034234816 abstract "The damping characteristics of a crosslinked polymer are determined by its viscoelastic properties. Yet the loss mechanisms of networks have not been fully understood. It is shown that insight into network behavior can be gained from studies of how viscoelasticity evolves during the curing process. In addition, the peculiar viscoelasticity of the incipient gel (the polymer exactly at the gel point) is shown to offer unique damping characteristics. Experimental studies on an epoxy system show that the evolution of structure prior to the gel point follows the predictions of percolation and that the divergence of the bulk viscosity and the power law behavior of the dynamic shear moduli, G′∼G″∼ωΔ, at the gel point follow the predictions of a dynamic scaling theory. A new superposition principle (time-cure superposition) holds for the linear viscoelastic responses at different extents of reaction in the critical regime both before and after the gel point. From the master curve beyond the gel point, the divergence of the inverse equilibrium modulus and the terminal relaxation time are shown to obey the theoretical predictions as well. In addition, an intriguing relationship exists between the relaxation time spectra of a network at the gel point and in the fully cured state. Measurements of the dynamic shear moduli of several epoxy and siloxane networks, with equilibrium moduli varying by four orders of magnitude, show G″∼ωΩ at all extents of reaction past the gel point, where the network viscoelastic exponent Ω remains at the incipient gel value Δ. This surprising correspondence suggests that chemical networks possess some remnant of the fractal structure of the incipient gel. [Work supported by the U.S. DOE under Contract No. DE-AC-04-76DP00789.]" @default.
- W2034234816 created "2016-06-24" @default.
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- W2034234816 date "1992-04-01" @default.
- W2034234816 modified "2023-09-26" @default.
- W2034234816 title "Viscoelasticity of crosslinked gels." @default.
- W2034234816 doi "https://doi.org/10.1121/1.403358" @default.
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