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  • 1 Institute of Macromolecular Chemistry National Academy of Sciences of Ukraine 253160 Kiev Ukraine
  • 2 Institute of Applied Mechanics Russian Academy of Sciences 117334 Moscow Russia
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Unfilled and carbon black-filled samples of synthetic isoprene- and butadiene-methylstyrenebased rubbers were characterized by precise heat capacity measurements in the temperature interval 4.2–300 K. Both unfilled samples proved to behave in an essentially fracton-like way in the temperature interval 6–30 K. The excess thermodynamic quantities derived from the smoothed data suggested that the thermodynamic state of the elastomeric phase in the filled rubbers was intrinsically unstable.