PHYSICAL AND RHEOLOGICAL PROPERTIES OF NITROSO RUBBERS
Technical Report,25 Mar 1965,24 Jun 1965
MONSANTO RESEARCH CORP DAYTON OH DAYTON
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Characterization of a trifluoronitrosomethanetetrafluoroethylene copolymer was continued. The previously reported volatile portion of the fluoronitroso gums was identified as purely low molecular weight fractions. No other contaminants were found. Removal of this low molecular weight portion was demonstrated by solvent precipitation and vacuum drying techniques. The low molecular weight portion boils predominately in the 100C region and is present up to 200C. Except for average molecular weight no differences were noted between the present Thiokol gums and the earlier 3M gum. A usable solventnon solvent system consisting of FC-75 and benzotrifluoride was determined and the useful solvent ratios and temperatures set. The 1000 cycle per second glass transition was determined to be -18C. Amine cure of the Thiokol gum following a recommended procedure provided poor rubber specimens. Violent decomposition of the cured rubber occured at 270C as had the gum.
- Polymer Chemistry