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- W2091229145 abstract "A polyimide (PI) composite containing SiO2 and TiO2 hybridized nanoparticles was prepared by the sol-gel process. Polyamic acid (PAA) solution, the precursor of PI, was synthesized from 2,2′-bis-(3,4-dicarboxyphenyl) hexofluoropropane dianhydride and bis [4-(3-aminophenoxy) phenyl sulfone in N-methyl-2-pyrrolidone. The SiO2–TiO2 hybrid nanoparticles were prepared by the sol-gel process in a PAA solution into which tetraethoxysilane, titanium (IV) tetrabutoxide and acetylacetone were mixed for subsequent hydrolysis and condensation reactions. After spin coating of this solution onto a glass substrate, the stepwise imidization to PI and the simultaneous gelation of the SiO2–TiO2 hybrid oxides were achieved at 100–300 °C. The complementing effects of reduced particle size and enhanced thermal stability of SiO2 and TiO2 on the resulting nanocomposite were observed. The former effect was contributed by TiO2 and the latter by SiO2. Uniform dispersion of 5- to 10-nm-diameter SiO2–TiO2 nanoparticles was obtained in the PI matrix. A 5-μm-thick film obtained from this procedure exhibited excellent optical transparency (91%, 500 nm) at 15 wt% SiO2 for a TiO2 content <5 wt%. The SiO2–TiO2 hybrid nanoparticle was prepared by the sol-gel process in polyamic acid solution for the synthesis of the polyimide (PI)/SiO2–TiO2 ternary hybrid nanocomposite. Complementing effects of SiO2 and TiO2 on the nanocomposite were observed, based on reduced particle size and enhanced thermal stability. A uniform dispersion of the SiO2–TiO2 nanoparticles in the PI matrix with particle size of 5–10 nm was obtained." @default.
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- W2091229145 date "2011-01-19" @default.
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- W2091229145 title "Complementary functionality of SiO2 and TiO2 in polyimide/silica–titania ternary hybrid nanocomposites" @default.
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- W2091229145 doi "https://doi.org/10.1038/pj.2010.117" @default.
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