| Summary: | 碩士 === 臺灣大學 === 高分子科學與工程學研究所 === 98 === This study was divided into two main parts. First, by using emulsion polymerization, PEDOT latex nanoparticles were synthesized. Second, the PEDOT latex obtained in first part was combined with Polyurethane ( PU ) to prepare the PEDOT/PU composite films with pH-tuning and anti-electrostatic properties.
In the first part, PEDOT latex nanoparticles were synthesized by emulsion polymerization, which both Fe(OTs)3 and H2O2 were used as mixed initiators during the polymerization. The morphology of PEDOT latex nanoparticles was observed by TEM and DLS. Results showed that the sizes of PEDOT nanoparticles were from 60 to 150 nm. The doping level of PEDOT latex was also observed via UV-visible spectrometer. In the second part, PEDOT latex nanoparticles were mixed with PU to prepare the PEDOT/PU composite films. We used unpurified PEDOT or purified PEDOT to fabricate PEDOT/PU composite films. The properties of PEDOT/PU composite films were measured by thermogravimetric analysis ( TGA ), differential scanning calorimetry ( DSC ) and tensilon to discuss the mechanical and thermal properties. The interaction and compatibility of the PEDOT/PU blends were also studied.
The conductivity of the unpurified PEDOT/PU composite films increased with the weight ratio of the PEDOT. When the weight of PEDOT reached to 2 wt%, the conductivity of PEDOT/PU composite film raised from 10-8 S/cm to 10-6 S/cm which located in the range of anti-electrostaticity. From the results of scanning electron microscopy ( SEM ), the unpurified PEDOT nanoparticles in PU films showed better dispersity and compatibility than the purified one.
The pH-tuning capacity of PEDOT latex and PEDOT/PU composite films were both tested in aqueous solution with different pH value.
The pH regulation capacities of PEDOT latex nanoparticles and PEDOT/PU composite films showed good ability in the region of pH=5-9 and weak basic region, respectively.
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