Effect of DMSO/H2O coagulation bath on the structure and property of polyacrylonitrile fibers during wet-spinning

The effect of coagulation bath condition on the structure and property of the nascent fibers and polyacrylonitrile fibers during wet-spinning is studied. The best coagulation condition to produce polyacrylonitrile fibers has been found by examination of EA, XRD, SEM, and so on. The results indicated that when the coagulation bath was DMSO/H2O system, the temperature was 60 degrees C, the concentration was 65%, the minus stretch ratio was -10%, fine crystallites and high degree of crystallization in the nascent fibers and polyacrylonitrile fibers could be achieved, and less solvents remained in the nascent fibers with circular cross section morphology. (c) 2007 Wiley Periodicals, Inc.