In situ preparation and characterization of polyimide/silica composite hemispheres by inverse aqueous emulsion technique and sol-gel method

摘要: In this paper, micron-scale polyimide/nano-silica (PI/nano-SiO2) composite hemispheres were fabricated by employing inverse aqueous emulsion technique and sol-gel method. Homogeneous was obtained through using the precursor solution as dispersed phase which contained poly(amic acid) ammonium salt (PAAS), tetraethyl orthosilicate (TEOS) deionized water, liquid paraffin (LP) continuous phase, Span80 surfactant. The PI/SiO2 hybrid could be got adding excess dehydrating agent into emulsion. Fourier transform infrared (FT-IR) results demonstrated that PAAS had been converted to polyimide (PI) after success of reaction between TEOS molecules. research showed morphologies hemispheres, compared with pure PI still hemispherical did not change varied silica contents. surfaces these samples without clear interface SiO2 particles polymer matrix. And, SEM images hydrofluoric acid (HF) etching or high temperature calcination well in organic component, diameter nano-scale. EDX spheres some 99.98 % removed removal respectively. Furthermore, thermal gravimetric analysis (TGA) stability improved incorporating inorganic component.