Method for preparing tenacity and modulus polyacrylonitrile fibe

Details Method for preparing tenacity and modulus polyacrylonitrile fibe Method for preparing tenacity and modulus polyacrylonitrile fibe

1986-09-18

1989-11-28

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264182, 264206, 2642108, 26421115, 26421116, 2642905, D01F 618

Patent

active

048836281

ABSTRACT:
Polyacrylonitrile (PAN) fibers are prepared by forming a 2-15 weight % solution of PAN of M.sub.w at least 500,000, extruding, cooling to below the gel temperature, extracting and drying. At least one of the gel fiber, the fiber containing extraction solvent and the dried gel is stretched. The product PAN fibers have a M.sub.w at least 500,000 (e.g. 1,000,000-4,000,000 or 1,500,000-2,500,000), a tenacity at least 5 g/den (e.g., at least 7 g/den) and a secant modulus at least 100 g/den (e.g. at least 125 g/den).

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