Abstract: Abstract: The development of poly(phenylene-1,3,4-oxadiazoles) (POD) fibers in home and abroad were discussed. The functional monomers containing phosphorus or halogen were copolymerized with POD for improving the cyclization degree and flammability of POD fibers, whose LOI can be up to 30. The coagulating conditions had an influence on the aggregation state, surface and mechanical properties of POD fibers. Sulphuric acid solution of 40~50% concentration is the best coagulating agent. Compared with other heat resistant fibers, POD fibers have a better thermal stability than PPS, Nomex and Tanlon. Besides, the good combination of other performance, such as mechanical properties, chemical resistance and dyeing ability, enhances the application of POD fibers in many fields.

Key words: poly (phenylene-1, 3, 4-oxadiazole) (POD) fiber , high temperature resistance , flame retardant , structure