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PHYSICAL AND RHEOLOGICAL PROPERTIES OF FLUORONITROSO RUBBERS
MONSANTO RESEARCH CORP DAYTON OH DAYTON LAB
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Characterization of the copolymer trifluoronitrosomethane tetrafluoroethylene was completed. The CF3NOC2F4 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 CF3NOC2F4 gum and rubber occurred at CF3 approx. 260C. The initial decomposition was confirmed to be CF3NOC2F4 to COF2 CF3NCF2. 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.
APPROVED FOR PUBLIC RELEASE