| Summary: | 碩士 === 國立中興大學 === 化學工程學系所 === 106 === In this study, pyrrole (Py) is polymerized into conductive polymer polypyrrole (PPy) by using ferric chloride (FeCl3) as oxidant on the surface of silica (SiO2) , form a conductive polypyrrole/silica (PPy/SiO2) nanocomposites. For PPy/SiO2 characteristics, appearance and electrical conductivity, to explore the dopant sodium dodecylbenzenesulfonate (DBSNa), monomer Py, oxidant FeCl3 and pretreatment of 3-aminopropyl- triethoxysilane on SiO2 surface
The research is divided into three parts: (I) without adding SiO2, PPy polymerization, (II) without treatment of APS on the SiO2 surface of and (III) with pretreatment ofAPS on SiO2 surface, then PPy/SiO2 polymerization.
In part (I) without SiO2, PPy polymerization, the control factor is the concentration of DBSNa. Adding DBSNa as a dopant can improve the conductivity of PPy. The conductivity of PPy increases first with the increase of DBSNa, and then decreases after reaching a maximum value. The highest conductivity was 6.24 S/cm when the molar ratio of DBSNa to Py was 0.1: 1.
In part (II) without treatment of APS on the SiO2 surface, then PPy/ SiO2 polymerization. The controlling factors were the adding order of dopant and monomer, the concentration of DBSNa, the amount of Py, and the concentration of FeCl3 for PPy / SiO2 polymerization. The experiment of changing the order of addition of DBSNa and Py, the conductivity of DBSNa first (24.41 S/cm) was higher than that of Py first (8.87 S/cm). The experiment of changing DBSNa concentration showed that the conductivity increased firstly and then decreased with the increase of DBSNa concentration. The highest conductivity was 24.41 S/cm when the molar ratio of DBSNa to Py was 0.1: 1. The experiment of changing the amount of Py shows that the conductivity increases first and then decreases with the increase of the amount of Py, and the highest conductivity is 24.41 S/cm when the weight ratio of SiO2 to Py is 2：1. The experiment of changing FeCl3 concentration showed that the conductivity increased firstly and then decreased with the increase of FeCl3 concentration. The highest conductivity was 24.41 S/cm when the molar ratio of FeCl3 to Py was 2.5: 1. All control factors, the most conductive is the impact of FeCl3 concentration.
In part (III) with treatment of APS on SiO2 surface, then PPy/SiO2 polymerization, the control factor is whether the surface of SiO2 is treated with APS or not, and changing the adding order of dopant and monomer. When APS is treated on SiO2 surface and without DBSNa, the conductivity will increase. The conductivity is 11.49 S/cm (the conductivity of untreated SiO2 is 2.64 S/cm). However, APS treated SiO2 with DBSNa, the conductivity decrease. The conductivity is 10.58 S/cm (the conductivity of the untreated SiO2 is 24.41 S/cm). It is shown that when APS is treated on SiO2 surface exhibits lipophilicity and the affinity to Py of lipophilicity increases, but the affinity to DBSNa decreases, which affects the doping of DBSNa. The experiment of changing the order of addition of DBSNa and Py, the conductivity of DBSNa first(11.22 S/cm) was higher than that of Py first (6.26 S/cm).
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