In order to avoid the inherent photo-catalysis and aggregation of TiO2 in PPS, TiO2 nanoparticles were coated with SiO2 layers, which were chosen as the UV absorbent to improve the UV stability of polyphenylene sul fi de（PPS） fi ber. The PPS–TiO2@SiO2 nanocomposites fi bers were prepared via melt spinning, and the nanocomposites fi bers displayed different crystallization behaviors on variation of the diameters of TiO2@SiO2 nanoparticles, as con fi rmed by Differential Scanning Calorimetry（DSC）. The spinnability, breaking strength and UV-resistance properties of PPS nanocomposites fi bers, as measured by homemade melt spinning machine, Xenon-lamp Weather Resistance Test Chamber and Yarn Tensile Tester, manifested the dependence on the diameters. The addition of nanoparticles with the diameter of 25 nm improved the spinnability and the mechanical performance of PPS most, which is attributed to the heterogeneous nucleation effect of nanoparticles. The UVresistance properties of the PPS nanocomposites were improved by the addition of TiO2@SiO2 nanoparticles. After aging for 180 h, PPS nanocomposites fi ber still maintained a high strength.
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