Preparation of polyacrylonitrile and cellulose acetate blend fibers through wet-spinning

Fibers containing both polyacrylonitrile (PAN) and cellulose acetate (CA) were prepared through wet-spinning by using NN-dimethylformamide (DMF) as a solvent. Compatibility of PAN and cellulose acetate blend (PCB) fibers was investigated by means of scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and infrared (IR) spectrophotometry. The absorptive capacity and mechanical properties of the fibers were measured. It was observed that the surface and the cross section of PAN fibers were quite smooth and free from voids and microcracks, whereas cracks and voids were present on the surface and cross section of blend fibers, which increased with the incorporation of CA in the blend. Moisture regains of blend fibers were quite high while their tensile properties showed a partial decrease. (c) 2006 Wiley Periodicals, Inc.