Preparation and properties of hydroxyapatite/polybenzimidazole composite aerogel fibers
Hydroxyapatite nanowires/polyether polybenzimidazole(HAPNW/OPBI)composite aerogel fibers(CAFs)were prepared with OPBI as the matrix and self-made HAPNW with high aspect ratio as the inorganic filler by oxidation gel spinning and freeze drying processes.The effects of HAPNW content on the microstructure and properties of CAFs were studied.The re-sults showed that HAPNW was uniformly dispersed in CAFs and the surface and interior of CAFs both had a uniform porous struc-ture when the mass fraction of HAPNW was 5％-10％;CAFs exhibited excellent comprehensive properties and the specific sur-face area,porosity and tensile strength were increased to 155.45 m2/g,85.51％and 17.7 Mpa,respectively,when the mass fraction of HAPNW was 10％;the addition of HAPNW had no significant effect on the thermal decomposition behavior of CAFs,but made their combustion resistance and high-temperature insulation performance improved,CAFs had the thermal decomposi-tion temperature up to 575℃ under nitrogen atmosphere and did not burn in flames when the mass fraction of HAPNW was 10％,and the thermal conductivity was 53.1 W/(m·K)and the surface temperature of CAFs fabric was stable at around 159 ℃ on a 200 ℃ heating platform.
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维普
