%0 Journal Article
%T Performances and structure changes of neat PPS fiber and nano Ti
%A Dandan Lian
%A Jianjun Lu
%A Jinming Dai
%A Ruiping Zhang
%J High Performance Polymers
%@ 1361-6412
%D 2018
%R 10.1177/0954008317696346
%X Neat polyphenylene sulfide (PPS) fiber and nano titanium-silicon dioxide-modified PPS fibers (A-PPS) were submitted to an over-temperature in air environment at 200, 220, and 240¡ãC for 24, 192, and 360 h, respectively. Molecular and supramolecular structures were characterized by differential scanning calorimetry, X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy (XPS). The outside color of the PPS fibers turned yellow and the mechanical properties were reduced after over-temperature, but the performances of the A-PPS fibers were better than that of the neat PPS fibers. The analyses of the molecular and supramolecular structures showed that the temperatures of 200 and 220¡ãC could not change the crystalline form but could increase the crystallinity of the PPS fibers. The crystallization temperature high-shifted and the crystallization FWHM increased after over-temperature. More significant changes at 240¡ãC could be observed such as breaking of the macromolecular chains, mutual cross-linking, and increase of the melting enthalpy to a higher value than the complete crystallization enthalpy of PPS. Cross-linking between the benzene rings and oxidation of the S atoms did not change the PPS crystalline form but decreased the lattice constant. XPS spectra showed that the cross-linking and oxidation of the S atoms of the PPS fibers mainly came from the breaking of the C¨CS¨CC bonds, while the break ratio of the C¨CS¨CC bonds was relatively smaller in the case of the A-PPS fibers
%K Neat and modified PPS fibers
%K over-temperature oxidation
%K properties
%K molecular and supramolecular structures
%U https://journals.sagepub.com/doi/full/10.1177/0954008317696346