Electrochromic Properties, Corrosion Protection and Flame-Retardance of the Electroactive Polyimide Nanocomposites

• Main Authors: Fu-Chin Lin, 林福欽
• Other Authors: Rong-Hsien Lin
• Format: Others
• Language: zh-TW
• Published: 101
• Online Access: http://ndltd.ncl.edu.tw/handle/g9azj4

碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系 === 100 === An amic acid tetramer without amine groups (－NH2) on both ends was preliminarily synthesized from N-phenyl-p-phenylenediamine and 4,4’-oxydiphthalic anhydride. Then, the synthesized amic acid trimer was reacted with different chain length of amine-capped polyaniline oligomer via oxidative coupling polymerization to produce a series of poly(amic acid)s (PAA) with different level of aniline segments on the PAA main chain. Subsequently, the corresponding electroactive polyimides (PI) were then obtained from imidization of previous PAA by a heating method. Additionally, the more different types of electroactive polyimide nanocomposites were prepared by blending PAA with different kinds of nanoparticles and subsequently by conducting imidization. Nanoparticles were prepared via a sol-gel method, and the resulting nanoparticles concluded (1) silicon dioxide containing epoxy functional groups, and (2) antimony oxide. In addition, the molecular weight of the various types of the electroactive polyamic acid were measured by GPC (gel permeation chromatography), and the resulting high molecular weight circumstantially confirmed that oxidative coupling polymerization has indeed carried out .The resulting electroactive polyimides were identified by FT-IR. The structure of nanoparticles in materials were identified by solid-state Si29 NMR or X-ray. The sizes of nanoparticles in materials were measured by SEM. The results showed that various types of electroactive polyimide and their nanocomposites had been successfully fabricated. Finally, various physical properties were also investigated. Corrosion measurement suggested that electroactive polyimide nanocomposite containing silica is the best one in anticorrosion property. TGA results indicated that electroactive polyimide nanocomposite containing antimony oxide has the best thermal stability. The flame-retardance was examined using limited oxygen index (LOI) instrument, the results show that the LOI value of the electroactive polyimide nanocomposites containing antimony oxide was up to 44. Moreover, electrochemical activity of electroactive PIs were conducted in 1.0 M H2SO4 aqueous solution by a cyclic voltammetry, and it was found the Q value of aniline-heptamer-based electroactive polyimide can reach 6.68×10-2 C. UV-Vis spectra suggested that electroactive polyamic acid was of performance in color changes.