Abstract
Creep and low-frequency dynamic viscoelastic measurements in shear have been made on two series of lightly cross-linked natural rubber samples swollen to different extents in nonvolatile solvents. The time and frequency regions corresponded to the zone of slow, secondary relaxation mechanisms in such networks. The diffusion of radioactively tagged n-hexadecane in trace amounts through these samples has also been measured, reflecting local molecular mobility. Viscoelastic data at different temperatures were combined by the method or reduced variables in the usual manner. Data at different degrees of swelling (measured by the polymer volume fraction, v2) could be approximately superposed by reduced variables with the frequency scale shifted by a factor λ2 and the compliance magnitude scale multiplied by a factor \\mathfrakA. The factor λ2 decreased with decreasing V2 much more rapidly than the ratio of diffusion constants, D0/D, in the dry and swollen rubbers; the ratio λ2/(D0/D) was approximately v23.5. The factor \\mathfrakA was proportional to a power of V2 intermediate between the values of 1/3 expected for a Gaussian cross-linked network and 2 expected for an entanglement network; this power decreased with increasing cross-link density. The data were compared with previous results on cross-linked rubbers diluted before cross-linking, and on swollen networks of poly(β-hydroxyethyl methacrylate).
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Wong, CP., L. Schrag, J. & D. Ferry, J. Molecular Mobility in Swollen Cross-linked Rubbers. Viscoelasticity and Diffusion Measurements. Polym J 2, 274–282 (1971). https://doi.org/10.1295/polymj.2.274
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DOI: https://doi.org/10.1295/polymj.2.274