| Summary: | 碩士 === 國立中興大學 === 材料工程學研究所 === 92 === Abstract
Polyaniline (PANI), one of the intrinsically conducting polymers (ICPs), contains good processability, excellent environmental stability, and reversible control of conductivity both by protonation and by charge-transfer dopping.However, comparing to other ICPs, the conductivity of PANI is not obvious so that its application is limited. In order to promote the conductivity of PANI, the PANI/carbon nanotubes (CNTs) and PANI/carbon black (CB) nanocomposites was prepared by in-situ polymerization.
CNTs has high aspect radio, specific surface area, excellent thermal and electrical conductivity, so it is one of the best choice for reinforcements. However, CNTs is easily congregate and not soluble in water or organic solution.In this study, due to the presence of Van deer Waal force, surface treated CNTs by grafting carboxylic acid and thionyl chloride is prepared to improve the solubility of CNT. The treated CNT were mixed with aniline to form a charge-transfer complex at 80℃. After the mixture of aniline and CNTs was heated at reflex, the aniline and CNTs may form a charge-transfer complex.
The addition of 3wt% CNTs or CB into polyaniline, the morphology of nanocomposites look like a “core-shell ” structure. It is because PANI covers the surface of CNTs or CB. On the other hand, when CNTs or CB are not functionalization, the phenomena was not clear.
Regarding to the measure for the conductivity of nanocomposites, the curve of conductivity is very complicated as the ratio of CNTs increases. The calculated result based on the rule of mixture shows similar tendency and is related to the change of morphology.
The conductivity of nanocomposites are in the order of PCNT＜PcCNT＜PaCNT. By adding 1wt% CNTs in PfCNT, the conductivity is higher than those observed. In the meanwhile, the study has showed that adding CB also can improve the conductivity of PANI. However, the volume of CB would be several times higher than that of CNTs, due to the continues structure of CNTs.
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