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The rheological behavior of flexible-chain polymers in the region of high shear rates and stresses, the critical process of spurting, and supercritical conditions of their movement at T > Tg

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Abstract

Methods of capillary viscometry were used in studying the rheological properties and behavior of a broad range of rubbers, including polymers with narrow and wide molecular-weight-distribution as well as commercial rubber grades, at widely varying shear rates and stresses. As is shown, in full conformity with the previously conducted experiments, during transition from a fluid to highelastic (quasi-cross-linked) state, they are chracterized by spurting followed by sliding over the channel walls. This relaxation transition is characterized by a critical shear stress value invariant with respect to the molecular weight, molecularweight distribution and temperature. The parameters defining spurting of polymer flow as a function of molecular-weight characteristics, temperature, and channel geometry have been investigated in detail. It is shown for the first time that under supercritical conditions the rate of polymer flow through channels does not depend, in the first approximation, on the molecular weight of the polymer, its molecularweight distribution, temperature, and filling, but is determined only by the shear stress.

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Authors and Affiliations

  1. Institute of Petrochemical Synthesis, USSR Academy of Sciences, Leninsky Prospect 29, 117912, Moscow GSP-1, USSR

    G. V. Vinogradov, V. P. Protasov & V. E. Dreval

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  1. G. V. Vinogradov
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  2. V. P. Protasov
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  3. V. E. Dreval
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Vinogradov, G.V., Protasov, V.P. & Dreval, V.E. The rheological behavior of flexible-chain polymers in the region of high shear rates and stresses, the critical process of spurting, and supercritical conditions of their movement at T > Tg . Rheol Acta 23, 46–61 (1984). https://doi.org/10.1007/BF01333875

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  • DOI: https://doi.org/10.1007/BF01333875

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