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A thermoplastic, rubbery polymer. Polyisoprene (cis-1,4-polyisoprene), is the primary component in Caoutchouc that was used to make vulcanized natural rubber. Both the cis and trans forms of the polymer may be produced synthetically. The trans form resembles Gutta-percha. Both types can be vulcanized with Sulfur.



Synonyms and Related Terms

polyisoprène (Fr.); poliisopreno (Esp.); polisoprene (It.); poliisopreno (Port.); cis-1,4-polyisoprene; trans-1,4-polyisoprene;

Physical and Chemical Properties

  • Soluble in aliphatic and aromatic solvents. Insoluble in acetone, diethyl ether.
  • Burns with a dark yellow, sooty flame that smells like burnt rubber.
Composition (C5H8)n
CAS 9003-31-0


General Characteristics of Polymers

Physical Properties for Selected Thermoset Resins

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 676
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993

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