Improving the UV resistance of aromatic poly(1,3,4‐oxadiazole) fiber using the disperse dye modified with octavinyl POSS. Part 2: Fixing form of dye and UV resistance ability

Abstract

Disperse Red 60 modified with octavinyl polyhedral oligomeric silsesquioxanes (POSS) was used to color poly(p-phenylene-1,3,4-oxadiazoles) (p-POD) fiber. The dyed p-POD fiber was given high UV resistance and excellent color strength (K/S value) simultaneously. And the effects of the UV irradiation time on the K/S values and the strength retention of dyed fiber were investigated. The results indicated that the modified dye (1:3) molecules can easily be adsorbed on fiber surface and diffuse into fiber, whose fixing form on the fiber surface is a semiembedded type. Meanwhile, the surface morphology, the aggregation structure, the thermal property, the color fastness, and anti-UV durability of the dyed p-POD fiber were characterized. After UV accelerated aging, the macroscopic and microscopic structures of the dyed p-POD fiber can well be maintained and the color fastness is also satisfactory. Meanwhile, this method also solves the problem of poor anti-UV durability of the modified fiber with the previous processes.