Polymerization and Wet-spinning of Flame Retardant Poly(acrylonitrile-co-vinylidene chloride) Copolymers: Effect of Vinylidene Chloride Content

초록

To develop flame retardant fibers, poly(acrylonitrile-co-vinylidene chloride) (PANVDC) copolymers of various compositions were polymerized by aqueous suspension polymerization using a redox initiator and their fibers were wet spun. The polymerization conversions of PANVDC copolymers were higher than 79.7% and their weight-average molecular weights were higher than 150000 g/mol. The composition analysis of the PANVDC copolymers using H-1 NMR spectroscopy and combustion ion chromatography was suggested, and the monomer composition ratio determined in the PANVDC copolymers was similar to the molar feed ratio of monomers. The PANVDC copolymers had self-extinguishing properties and therefore had better flame retardant properties than poly(acrylonitrile-co-vinyl chloride). PANVDC fibers were wet-spun using dimethyl sulfoxide (DMSO) as a spinning solvent and DMSO/water (50/50 w/w) as a coagulating solution. PANVDC (AN/VDC=7/3 mol/mol) fiber exhibited commercial grade tensile strength, but PANVDC (AN/VDC=6/4 mol/mol) and PANVDC (AN/VDC=5/5 mol/mol) fibers showed very low tensile strength due to the internal pores generated during coagulation process.

키워드