Study On The Dyeing And Light Stability Of Modified Polyaromatic Oxadiazoles Fibers

With the rapid development of molecule materials, the high temperature-resistantsynthetic fibers emerge endlessly, such as, polytetrafluoroethylene, polyphenylene sulfidefiber and meta-aramid. Modified aromatic oxadiazoles fiber is also one of the hightemperature-resistant fibers, which is prepared by introducing of flame retardant andfunctional regular monomer in the molecular chain of poly phenylene-1,3,4-oxadiazoles(p-POD) through wet spinning method. This fiber not only has hightemperature resistance, resistance to chemical corrosion and outstanding electricinsulativity but has the advantages of the abundant raw materials, simple synthesis method,common process and good development prospects. However, the fiber is sensitive to UVlight due to the molecular chain structure of benzene ring and oxadiazoles ring alternatingconjugate, which results in strong strength damage and serious light fading of fibers underthe daylight radiation.In this study, Disperse Blue2BLN was adopted to investigate the dyeing dynamicsand the thermodynamics of this fiber. The results showed that under the same dyeingconditions, compared with PET fibers, the dyeing dynamic performance of POD fibers wassuperior to PET fibers and the thermodynamics performance was similar to the PET. Themain parameters influencing disperse dyed POD fibers including dyeing temperature,holding time, pH value and bath ratio were investigated. The results showed that theoptimum dyeing process was that the fiber was dyed at room temperature and warmed upto120℃for30minutes under neutral condition.The effects of different structure disperse dyes on the light stability of the modifiedpolyaromatic oxadiazoles fibers were investigated. The results showed that the lightstability of disperse dyes to POD fibers was relevant to the UV-absorption/transmissioncharacteristics of disperse dyes. And diazo dyes had better UV protection effect for POD fibers than anthraquinone and mono azo dyes.Azobenzene containing structure of4,4-azo phthalate was synthesized and introduced into PODfibers through solution spinning polymerization method. The results showed that the introduction of4,4-azo phthalate effectively improved the anti-aging performance of POD fibers and extending itsapplication fields without affecting the intrinsic properties of fibers.