Properties of Modacrylic Fibers Prepared from Poly(acrylonitrile- co -vinylchloride)—Experimental and Theoretical Studies on Coagulation and Diffusion during Wet Spinning

In this study, we investigated the changes in the morphology, crystal structure, and mechanical properties of poly(acrylonitrile- co-vinylchloride) under various spinning conditions such as distance and concentration of coagulation bath and draw ratio. In addition, the diffusion rate of the solvent from the fiber during coagulation was studied to investigate the correlation between the properties of spun fiber and coagulation conditions. The mechanical properties and the crystal orientation were improved with the draw ratio at a constant concentration of the coagulation bath. Micro voids were decreased with increased initial dimethyl sulfoxide (DMSO) concentration in the coagulation bath at a constant temperature. In addition, the correlation between the spun fiber and its spinning conditions during the coagulation process was determined, leading to optimal spinning conditions.