Preparation, Characterization and Applications of Polyaniline/Silica Mesocomposites and Organic Acid-Doped Polyimide Membranes
| Autor: | Chien-Hua Hsu, 徐健華 |
|---|---|
| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 This study is divided in two parts, the first part mainly investigate the preparation, identification of different proportions of polyaniline / silica mesoporous composite material, its thermal conductivity change, while the second part is based on organic sulfur acid being doped polyimide film and explores their propertys. In first part, we present the comparative studies for the effect of aniline-modified mesoporous silica (AMS), raw silica (ARS) and non-modified raw silica (NRS) particles on the physical properties of as-prepared polyaniline (PANI)-silica mesocomposite (PSM), nanocomposite (PSN) and PANI-raw silica (PRSN) membranes. First of all, the aniline-modified silica particles were synthesized by performing conventional base-catalyzed sol-gel reactions of TEOS in the presence/absence of PAPTMS molecules. The as-prepared aniline-modified silica particles were then characterized through Fourier Transform Infrared (FTIR), solid-state 13C-nuclear magnetic resonance (13C-NMR) and 29Si-NMR spectroscopy. Subsequently, the PSM and PSN materials were prepared through in-situ oxidation polymerization reactions of aniline monomers in the presence of AMS, ARS and NRS particles. The dispersion capability of silica particles in polymer matrix was further observed by transmission electron microscopy (TEM) studies. Gel permeation chromatography (GPC) was used to determine the molecular weights of as-prepared samples. Effect of material composition on the thermal, mechanical, surface and gas permeability properties of PSM and PSN membranes were investigated by thermal gravimetric analysis (TGA), transient plane source (TPS) technique, dynamic mechanical analysis (DMA), contact angle measurement and gas permeability analysis (GPA) technique, respectively. Another part, we combine the amine-capped aniline trimer (ACAT) and 4,4’-(4,4’-Isopropylidene-diphenoxy)bis(phthalic anhydride) (BSAA) to prepare the Electroactive Polyimide (EPI) by using casting method, and conventional non-electroactive Polyimide (PI) membranes were also prepared for control experiments. Initial we identify chemical structure of Electroactive Polyimide (EPI) with Fourier transform infrared spectroscopy (FT-IR), the liquid NMR spectrometer (1H-NMR) and mass spectrometry (Mass). Further explore a different chain lengths of the organic sulfonic acid doped membranes with electroactive conjugated segment ACAT in thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and permeability analysis (GPA) trend. Finaly, we use the Systematic comparison of non-electroactive Polyimide (PI) and Electroactive Polyimide (EPI) and emergent effective with the electroacitve segment of electroactive polyimide membrane. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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