| Summary: | 博士 === 中原大學 === 化學研究所 === 94 === This study first prepared two kinds of polymer of waterborne polyurethane (WPU) and organo-soluble polyimide (SPI). Subsequently, a series of hybrid materials containing silica or clay were prepared by performing the sol-gel reactions involving tetraethyl orthosilicate (TEOS) and the solution dispersion technique of montmorillonite. The as-synthesized polymers and hybrid materials were then characterized by FTIR spectroscopy, transmission electron microscopy (TEM), wide-angle powder X-ray diffraction (XRD), atomic force microscopy (AFM), gel permeation chromatography (GPC), solid state 29Si NMR and 1H NMR.
The effects of material composition on the anticorrosive performance, mechanical strength, optical clarity, thermal stability, surface wettability and molecular permeability of hybrid materials was also assessed via the cyclic voltammetry (CV), dynamic mechanical analysis (DMA), UV-visible transmission spectra, thermal gravimetric analyzer (TGA), contact angle and vapour permeability analyzer (VPA), respectively.
This essay comprises four parts. In the first part, a series of PU-clay nanocomposite materials were characterized and measured, showing that the PU-Na+-montmorillonite has stronger anticorrosion properties and a larger gas barrier than PU-organophilic clay,owing to the Na+-montmorillonite being more hydrophilic than organophilic clay and Na+-montmorillonite being well dispersed in the WPU matrix.
Section two successfully prepares a series of PU-silica hybrid materials consisting of amino-terminated anionic WPU and inorganic silica particles via the sol-gel process without the external catalyst.
Section three successfully a series of polyimide-clay nanocomposite materials (PCN), comprising of synthesized SPI, via the one-step method, and dispersed nanolayers of inorganic montmorillonite, by the solution dispersion technique. Compared to neat SPI and PCN, the PCN reduced the corrosion rate more effectively than the SPI.
In the fourth parts presents as-prepared polyimide-silica-clay nanocomposites materials (PSCN), and compared the silica and clay difference in the SPI matrix. The increase in nanolayer clay content increase and/or decrease in silica content in the SPI matrix enhances the gas barrier and anticorrosion properties.
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