Synthesis and Properties of Organic-Inorganic Nanocomposite Materials Prepared by Photopolymerization and Chemical Imidization

• Main Authors: Wei-I Hung, 洪偉毅
• Other Authors: Jui-Ming Yeh
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/53016018992998403628

碩士 === 中原大學 === 化學研究所 === 95 === In this thesis, we prepared two kinds of organic-inorganic hybrid materials (polymer nanocomposites) by different nano-technologies and materials. This essay is divided into two parts. In the first part, we outline a method for fabricating W/O microemulsion architectures containing different sizes of gold nanoparticles core in which surface-modified with carboxyl groups and poly(2-hydroxyethyl methacrylate-co-methyl methacrylate) (PHM) copolymer shell materials (BGN) via chemisorption followed by photopolymerization. Unlike in curing of composite components by ultraviolet radiation for most studies, we have demonstrated the amphiphilic copolymer can be used as surfactants which encapsulated gold nanoparticles without solvent and enable the formation of thicker (bulk) structures than traditionally achieved. The morphology of gold colloidal nanoparticles were invertigated by transmission electron microscopy (TEM) technique and ultraviolet-visible (UV-Vis) absorption spectroscopy. In this study, the bulk nanocomposites were then foamed by using N2 as blowing agent in a batch foaning process in order to discuss the nucleation effect of gold nanoparticles on the polyacrylate foams. The relational of compositions of bulk and foam observed by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and Hot disk. Moreover, it has been observed that the BGN materials have possess of higher compression modulus than PHM materials. The second part, a series of organic-inorganic hybrid materials have been successfully prepared by using acid-catalyzed sol-gel process that comprise organic soluble polyimide (SPI) and inorganic silica (SiO2). The as-synthesized hybrid materials were subsequently characterized by Fourier-transformation infrared (FTIR) spectroscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM) mapping technique. In this study, we are found that the hybrid materials containing 5 wt-% loading of silica exhibit an observable enhanced corrosion protection on cold-rolled steel (CRS) electrode at higher operational temperature at 60℃, which is much better than that of uncoated and similar to electrode-coated with SPI alone at room temperature at 30℃ based on the electrochemical parameter evaluations (e.g., Ecorr, Rp, Icorr, and Rcorr). Furthermore, we demonstrated that 6F-containing soluble polyimide display a good hydrophobic owing to the presence of hexafluoroisopropylidene unit by contact angle. In addition, the effects of the material composition on the gas barrier, thermal stability and mechanical properties were also evaluated by gas permeability analyzer (GPA) (e.g., O2 and N2), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA), respectively.