PHYSICAL AND RHEOLOGICAL PROPERTIES OF NITROSO RUBBERS

Abstract

Characterization of a trifluoronitrosomethane/tetrafluoroethylene copolymer was continued. The molecular weight (light scattering) of a gum rubber fraction was determined to be 484,000 when examined in the perfluorocyclic ether solvent. Previous determinations on gums in perfluorotributylamine and Freon 113 indicated a molecular weight of 400,000 and 200,000, respectively. Respective intrinsic viscosities were 0.44, 0.41 and 0.18. Mold cure plus a stepped post-cure was found necessary in order to obtain adequately vulcanized samples. One part of carbon black in an amine-cured, SiO2-filled nitroso rubber increased strength and hardness to produce a rubber of 267 psi strength, 420% elongation and 47 Shore A hardness units. Dynamic modulus measurements indicate a utility for the rubber well below -75C. A white precipitate found in earlier gums was not conclusively identified except that it was shown to be chemically different from the typical nitroso gum.

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Document Details

Document Type
Technical Report
Publication Date
Oct 12, 1965
Accession Number
AD0628003

Entities

People

  • G. Iii L. Ball
  • I. O. Salyer
  • J. V. Pustinger

Organizations

  • Monsanto

Tags

DTIC Thesaurus Topics

  • Copolymers
  • Corporations
  • Elongation
  • Hardness
  • Light Scattering
  • Materials
  • Measurement
  • Mechanical Properties
  • Molecular Weight
  • Physical Properties
  • Polymers
  • Precipitates
  • Refractive Index
  • Scattering
  • Tensile Strength
  • Viscosity

Fields of Study

  • Materials science

Readers

  • Polymer Science and Engineering.
  • Software Engineering

Technology Areas

  • Microelectronics