Polyimide fibers
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorsTerry L. St. Clair, Catharine C. Fay, Dennis C. Working
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Abstract
A polyimide fiber having textile physical property characteristics and the process of melt extruding same from a polyimide powder. Polyimide powder formed as the reaction product of the monomers 3,4'-ODA and ODPA, and endcapped with phthalic anhydride to control the molecular weight thereof, is melt extruded in the temperature range of 340.degree. C. to 360.degree. C. and at heights of 100.5 inches, 209 inches and 364.5 inches. The fibers obtained have a diameter in the range of 0.0068 inch to 0.0147 inch; a mean tensile strength in the range of 15.6 to 23.1 ksi; a mean modulus of 406 to 465 ksi; and a mean elongation in the range of 14 to 103%.
Claims9
A polyimide fiber produced from a polyimide powder prepared from the reaction product of 3,4'-oxydianiline and 4,4'-oxydiphthalic anhydride monomers and endcapped with phthalic anhydride to control the polymer molecular weight.
A polyimide fiber having a number average molecular weight in the range of 10,000 g/mole to 20,000 g/mole.
Dependencies are inferred from the claim text.