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FLUORINATED POLYMERS AND FLUIDS
Summary rept. 1 Dec 1965-30 Nov 1966
MONSANTO RESEARCH CORP DAYTON OH
Pagination or Media Count:
The synthesis of difluoropyromellitic dianhydride, 2-2, 5-5, 6,6- hexafluoro-3-3- dihydroxybenzidine, 2-4-5- trifluororesorcinol, perfluoro-4- hydroxyphenyldimethyl- carbinol and tetrafluorobenzene-1-3-dithiol has been investigated. These and other compounds were employed in the synthesis of fluorinated aromatic model compounds and polymers. A low molecular weight perfluoro polycarbonate, a low molecular weight fluorine-containing co- polycarbonate and a fluorine-containing aromatic polyimide had higher thermo- oxidative stability than the corresponding hydrogenic polymers. Other fluorinated polycarbonates, polyimides, and a poly1-3-4-oxadiazole had lower thermo-oxidative stabilities. A perfluoro polybibenzoxazole could not be prepared. The reaction between pentafluorobenzene sulphonyl chloride and perfluoro-aromatics suggests new routes to fluorine-containing polymers. Synthesis routes to perfluoro aralkyl compounds, with potential as thermo- oxidatively stable fluids are being investigated. Perfluoro alicyclic compounds of moderately high thermal stability have been prepared. Perfluorinated heterocyclics have been synthesised. The thermal decomposition points of two heterocyclic ethers and an ester are also reported.
APPROVED FOR PUBLIC RELEASE