| Summary: | 碩士 === 長庚大學 === 化工與材料工程研究所 === 94 === Abstract
The purpose of this study is to modify the polyaniline (PAn) by incorporation with four compounds of normal aldehydes of different chain lengths: butyraldehyde, heptanal, octanal, and decanal. The four kinds of N-keto-alkylated polyanilines, which were poly[(N-butyl ketone)aniline], poly[(N-heptyl ketone)aniline], poly[(N-octyl ketone)aniline], and poly[(N-decyl ketone)aniline] were successfully synthesized.
By the NMR, IR, and XPS spectra, we confirmed that the derivatives have keto- and normal alkyl-groups. For UV-Vis spectra and true solution, the solubility of poly[(N-alkyl ketone)aniline]s in general organic solvents (such as tetrahydrofuran, ethanol, methanol, and acetone) increased with increasing the length of side-chain, whereas the solubility of derivatives decreased in the polar solvents (such as DMSO, NMP, DMF, and DMAc). In the XRD spectra, the structures of polyaniline derivatives were amorphous. In cyclic voltammorgram analysis, the derivatives all have two redox peaks and electrochemical activities, which were similar to that of PAn. It showed that the first and the second redox peaks shifted toward higher and lower potentials, respectively. Such potential shifting become more obviously with increasing the chain length.
With TGA analysis, the maxima decomposed temperature and the char yield at 700 ℃ of polyaniline derivatives were lower than that of PAn, and decreased with increasing of the side-chain length. The derivatives were very stable at 200 ℃. The conductivity of derivatives doped by hydrochloride and ferric chloride were in the range of 2.6×10-2 ~ 1.1×10-4 S/cm and 2.110-1 ~ 2.010-3 S/cm, respectively, which were lower than that of PAn doped by hydrochloride and ferric chloride. The derivatives doped by DBSA could be dissolved in DMSO solution.
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