The dependence of the rheological properties of synthetic 1,4-cis-polyisoprenes and their mixtures on mean molecular Weight, molecular weight distribution, filler type and filler' concentration is investigated. Particular consideration is given to the influence of the filler on the relations between the molecular and rheological properties of polyisoprene. Rheological models are suggested for calculating the viscoelastic characteristics of {soprene rubbers.
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