聚苯胺/黏土奈米複合材料之合成與性質研究

劉時州

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聚苯胺/黏土奈米複合材料之合成與性質研究

Preparation and Properties of Polyaniline/Clay Nanocomposite Materials

劉時州 , Masters　　Advisor：葉瑞銘　　

繁體中文

奈米複合材料. 防腐蝕性質； nanocomposites ； corrosion

Abstract │ Reference (78) │ Times Cited (15) │ Altmetrics

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Abstract

A series of nanocomposites materials that consisted of emeraldine base of polyaniline and layered montmorillonite (MMT) clay were prepared by effectively dispersing the inorganic nanolayers of MMT clay in organic polyaniline matrix via in-situ polymerization. Organic aniline monomer were first intercalated into the interlayer regions of organophilic clay hosts and followed by an one-step oxidative polymerization. The as-synthesized polyanilline-clay lameller nanocmposites materials were characterized by infrared spectroscopy, wide-angle powder X-ray diffraction, polarizing microscopy, and transmission electron microscopy. Polyaniline/clay nanocomposites in the form of coating with low clay loading (e.g., 0.75 wt %) on cold-rolled steel (CRS) were found much superior in corrosion protection over those of conventional polyaniline based on a series of electrochemical measurements of corrosion potential, polarization resistance, and corrosion current in 5 wt % aqueous NaCl electrolyte. The molecular weight of polyaniline extracted form polyaniline/clay nanocomposite materials and bulk polyaniline were determined by gel permeation chromatography (GPC), ultraviolet spectroscopy, and viscometry. Effect of the material composites on the gas barrier properity, thermal stability, and mechanical strength of polyaniline along with polyaniline/clay nanocomposites materials, in the form of both fine powder and free-standing film, were also studied by gas permeability measurements, differential scanning calorimetry, thermogravimetric analysis, and dynamic mechanical analysis. Open-circuit-potential technique was employed to monitor the oxidation polymerization process of polyaniline in the presence of clay.

Reference ( 78 ) 〈TOP〉

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8. H. Shirakawa, S. Ikeda. Polymer. 1971, 2, 231.
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