Accession Number : ADD018377

Title :   A Wet-Spinning Fiber Process Providing Controlled Morphology of the Wet-Spun Fiber.

Descriptive Note : Patent Application, Filed 12 Mar 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Buckley, Leonard J ; Eashoo, Mark

PDF Url : ADD018377

Report Date : 12 Mar 1996

Pagination or Media Count : 13

Abstract : The present invention employs a fluorinated PI (polyimide) in a wet spinning fiber process. The fluorinated PI was chosen because of its desirable properties for electronic applications, and the present invention is not limited to this type of fiber. The solvent used for spinning of the fiber (the solvent in the Spinning dope) requires a material which can form solutions with the polyimide. Examples include ethyl acetate, methylene chloride, and dimethylacetamide (DMAc). These solvents were chosen to reflect a large range of both solubility parameters and miscibility with water. For the coagulation bath utilized in the wet spinning process of the present invention, the coagulation baths range from 100% coagulant to 40% water which is equivalent to a mole fraction range between 1.0 and 0.2-0.3, with the lower limit dependent upon the non solvent used. The coagulant chosen was ethanol or methanol. The advantage of the present invention is that the internal morphology of the wet spun fibers can be controlled by varying the rate of polymer coagulation through adjustments in non-solvent/solvent miscibility and precipitation strength of the coagulation bath.

Descriptors :   *PATENT APPLICATIONS, *SPINNING(INDUSTRIAL PROCESSES), *COAGULATION, *POLYIMIDE RESINS, ELECTRONICS, RATES, PRECIPITATION, WETTING, METHANOLS, CHLORIDES, SOLUBILITY, ACETATES, ETHANOLS, ACETAMIDES

Subject Categories : Plastics
      Solvents, Cleaners, and Abrasives
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE