Preparation and Characterization of Cetyltrimethylammonium Bromide Modified Fly Ash Floating Bead/Polyaniline Composites
Fly ash floating bead (FAFB)was modified with the cationic surfactant cetyltrimethylammonium bromide (CTAB) at different conditions.The composite (FAFB-CTAB/PAn)was obtained by emulsion polymerization with aniline (An) as the monomer,dodecylbenzene sulfonic acid (DBSA) as the emulsifier and doping agent,and ammonium persulfate (APS) as oxidant.The structure and performance of the composites were analyzed by FTIR,XRD,SEM,TGA,chemical elemental analysis and four point probe technique.The results indicated that the FAFB was modified by CTAB successfully,the concentration of CTAB was 0.20 mol/L under a nomal atmosphere for 90 min at 80 ℃,which was the best of given conditon in this test,and the FAFB-CTAB/PAn composites were obtained by in situ polymerization method.TGA revealed that the amount of PAn coat on FAFB-CTAB was 9.80％.The thermal stability of FAFB-CTAB/PAn composite was enhanced by 25 ℃ and that can be attributed to the introduction of FAFB.The four point probe technique test showed that the conductivity of FAFB-CTAB/PAn was 0.06 S/cm as the polyaniline coating,but still in the scope of the semiconductor.
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