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

Buckley, Leonard J.; Eashoo, Mark

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

Active / Technical Report | Accession Number: ADD018377 | Open PDF

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-solventsolvent miscibility and precipitation strength of the coagulation bath.

Author(s):

Buckley, Leonard J. ; Eashoo, Mark

Author Organization(s):

DEPARTMENT OF THE NAVY WASHINGTON DC

Descriptive Note:

Patent Application, Filed 12 Mar 96,

Pagination:

0013

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:

Approved For Public Release

RECORD

Collection: TR

Identifying Numbers

Report Number(s):

PAT-APPL-800 328

Monitor Series:

ONR

Subject Terms

Joint Capability Areas:

JCA_1_Force Support; JCA_6_Net Centric

Modernization Areas:

Microelectronics

Communities of Interest:

No COI(s) Identified

Descriptor(s):

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

Field(s)/Group(s):

Plastics, Solvents, Cleaners and Abrasives, Manufacturing and Industrial Engineering and Control of Production Systems

Keyword(s):

MISCIBILITY, COAGULATION CONTROL, WET SPUN FIBERS, ACETATE ETHYL, METHANE DICHLORO, ACETAMIDE DIMETHYL, FLUORINATED POLYIMIDE

Report Date:

1996 Mar 12

Creation Date:

1997 Apr 30