PHYSICAL AND RHEOLOGICAL PROPERTIES OF FLUORONITROSO RUBBERS

Abstract

Characterization of the copolymer trifluoronitrosomethane/ tetrafluoroethylene was completed. The CF3NO/C2F4 copolymer was shown to be a low temperature rubber with probable high solvent and chemical resistance and with a reasonable thermal stability up to 250C. The gum samples consisted of 25-50% insoluble gel and approx. 3% insoluble basic magnesium carbonate trihydrate. Violent decomposition of both the CF3NO/C2F4 gum and rubber occurred at CF3 approx. 260C. The initial decomposition was confirmed to be: CF3NO/C2F4 to COF2 + CF3N=CF2. The glass transition temperature of the gums covered a range of -41 to -49C and that of the rubber was approx. -49C. Optimized cure conditions showed that lower cure temperatures and longer cure times were advisable, that MgO was valuable as a scavenger filler, and the PCR- bulk-polymerized gum provided a significantly better rubber. The best mechanical properties obtained were 387 psi tensile strength and 527% elongation. Impurities and extremely high molecular weights were detrimental to providing good mechanical properties.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1967
Accession Number
AD0672523

Entities

People

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

Organizations

  • Monsanto

Tags

DTIC Thesaurus Topics

  • Body Weight
  • Copolymers
  • Differential Thermal Analysis
  • Glass Transition Temperature
  • Light Scattering
  • Magnetic Resonance
  • Materials Processing
  • Measurement
  • Mechanical Properties
  • Molecular Weight
  • Nuclear Magnetic Resonance
  • Physical Properties
  • Refractive Index
  • Scattering
  • Thermal Analysis
  • Thermal Expansion
  • X Rays

Fields of Study

  • Materials science

Readers

  • Organic Chemistry
  • Reinforced Composite Materials
  • Systems Analysis and Design

Technology Areas

  • Microelectronics