Studies on Polyaniline-based Conductive Polymers

• Main Authors: Hsiao, Ching-Wen, 蕭景文
• Other Authors: Hsieh, Kuo-
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/79737560428707320324

碩士 === 國立臺灣大學 === 化學工程學研究所 === 89 === In this study, we tried to use polyaniline (PANI) particles as additives into polyurethane to improve the processibility of polyaniline, and so polyaniline particles must be dispersed well in the polyurethane. The experiments were divided into two parts: the first was to prepare polyaniline/polyurethane blends by mechanical blending. In this section we used two kinds of dopant of polyaniline, hydrochloric acid (HCl) and DL-10- camohorsulfonic acid (CSA). From the results, we found that owing to high interaction between CSA doped polyanline particles, the blends of polyanline-CSA/polyurethane of high polyaniline concentration would be precipitated. But the blends of HCl doped polyanline and polyurethane could have polyaniline content of 30 weight percent. The second part was to direct polymerize polyaniline in the sulfonated polyurethane aqueous solution. The polyurethane converted to sulfonated polyurethane by reaction of 1,3-propane sultone and urethane group. Both two parts, we used fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), to discuss the mechanical properties, thermal properties, interaction in the blends and compatibility of the blends. The conductivity of blends by mechanical blending is much lower than by in-situ doping polymerization of polyaniline in the sulfonated polyurethane. Thirty weight percent content of polyaniline in the blend by mechanical blending has conductivity of 7.86×10-3S/cm. But ten weight percent of that by in in-situ doping polymerization method in the sulfonated polyurethane has conductivity of 0.65 S/cm. We know from the results of scanning electron microscopy (SEM) and scanning tunneling microscopy (STM) that the interpenetrating polymer networks (IPNs) by second method have had better dispersity than first one. For electromagnetic interference (EMI) shielding effect, we found that the higher the conductivity, the better the shielding effectiveness (SE) and had nothing to do with polyaniline content. And different dopant will have different effect on EMI shielding. For microwave absorption, the sample had large polyaniline content would have good absorption effect.