Conclusions
1. The validity of the temperature-frequency superposition in the finite relaxation region has been confirmed for a concentrated solution of PIB filled with solid dispersed particles;
2. the apparent heat of activation of the viscoelastic relaxation times increases at and above a certain filler concentration (c=15%);
3. in the case of fillers for which the apparent heat of activation of the viscoelastic relaxation times is independent of the filler concentration, the filler only shifts the frequency functions of the components of the complex shear modulus along the logarithm of the modulus axis and the relaxation time spectrum H(θ) along the log H axis. In this case G′C/G′M=G″C/G″M=ηOC/ηOM=ηrel;
4. the effective filler concentration for c<ccrit, as determined from the concentration dependence of the initial viscosity, exceeds the nominal filler concentration by a factor of 2.4 to 2.8;
5. at a filler concentration c>ccrit, the contour of the relaxation time spectrum changes on account of the formation of a secondary filler structure;
6. when the filler concentration c<ccrit, the dependencies of the viscosity on the shear rate for the composites and the matrix can be reduced with respect to two parameters;
7. possible methods for the reduction of flow curves by means of linear coordinate transformations have been systematized.
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Institute of Polymer Mechanics, Academy of Sciences of the Latvian SSR, Riga. Translated from Mekhanika Polimerov, No. 6, pp. 1075–1083, November–December, 1977.
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Faitel'son, L.A., Yakobson, É.É. Rheology of filled polymers. Steady-state shear flow and periodic deformation. 1. Relaxation time spectra, viscosity. Polymer Mechanics 13, 898–906 (1977). https://doi.org/10.1007/BF00867000
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DOI: https://doi.org/10.1007/BF00867000