| Summary: | 碩士 === 國立臺灣大學 === 應用力學研究所 === 106 === The main goal of this thesis is to apply a fiber composite composed of electrospun poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) fibers and P(VDF-TrFE)/polystyrene (PS) fibers to aerosol filtration. The advantages of P(VDF-TrFE) are its high flexibility, good chemical resistance, high thermal stability and polarization capability. Electrospun P(VDF-TrFE) fibers with characteristics of P(VDF-TrFE) polymer and high surface-to-volume ratio may enhance the stability and efficiency of the filtration.
A series of studies are conducted to study the structure of the electrospun P(VDF-TrFE) fiber filters fabricated with different processing parameters, including solvent composition, solution feeding rate, P(VDF-TrFE) concentration, and addition of surfactant. The electrospun P(VDF-TrFE) nanofibers are developed with fiber diameter ranging from 780 nm to 180 nm. The filtration efficiency of P(VDF-TrFE) filter under different fiber diameter is quantified by challenging with sodium chloride particles. Among the measured filters of different fiber diameters, the finest fiber diameter of 183 nm has the best filtration performance. The P(VDF-TrFE) filters fabricated by different electrospinning collection time are also studied and compared. It is found that the quality factor decreased along with a longer collection time. In order to further improve the filtration efficiency of P(VDF-TrFE) filter, a P(VDF-TrFE)/PS composite filter is fabricated by a well-developed double-needle electrospinning method. P(VDF-TrFE)/PS composite filter has 92.17% filtration efficiency and 39.55 Pa pressure drop after corona charge treatment. Finally, the air filter developed in this thesis potentially can be applied for low energy consumption filtration system.
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