Preparation and properties of fibers from a crystalline polymethacrylonitrile



Fibers from a crystalline polymethacrylonitrile were prepared by dry spinning using trifluoroacetic acid as solvent. Stretchability increased when the solvent retained in the fiber was extracted with methanol. Tensile properties are well acceptable for practical use. It is notable that the stress–strain curve for the polymethacrylonitrile (PMAN) fiber shows clear yield point even under hot-wet condition (90°C in water). Thus, the PMAN fiber is expected to have improved “hot-wet properties” compared with conventional acrylic fibers. From the data in the compliance and resiliency maps, the PMAN fiber is expected to be one of the most promising fibers having wool-like properties.