Solution spinning of PAN-based polymers for carbon fiber precursors

Solution spinning of PAN-based polymers for carbon fiber precursors begins with a brief history, followed by methods of spinning, of which solution spinning is the focus. Following a discussion of the various solution spinning methods for PAN precursors, applicable polymer and solvent systems are discussed before proceeding into a discussion of dope preparation and rheological characterization. A discussion of the spinning process covers filtration, die swell, coagulation, washing, spin finish application, stretching, drying, collapsing and finally heat setting of the precursors. Following the spinning process, the resulting fiber properties and structure are described. Void and pore structure, fiber cross-section, fiber mechanical properties, and fiber morphology and their effect on the resulting fiber properties are discussed. Throughout, emphasis is placed on understanding the fiber formation mechanisms, particularly with regard to fiber coagulation, and its effect on the structure and properties of PAN precursor fibers.