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標題: Preparation and Characterization of Polyaniline / Carbon Nanotubes composites
作者: Lin, Yen-Wen
關鍵字: 聚苯胺;polyaniline;奈米碳管;複合材料;carbon nanotube;composite
出版社: 材料工程學研究所
將上述改質奈米碳管與苯胺單體進行原位聚合程序,製備而成之聚苯胺/奈米碳管複合材料進行型態分析,結果發現當補強物添加至一定量時(≧ 3wt%),複合物表面形態開始觀察到針狀或松果般層狀的連續管狀或球體複合物,此為聚苯胺包覆於奈米碳管或碳黑表面所形成的“core-shell”結構。此外,當奈米碳管或碳黑未經官能基化程序,複合物易發生奈米碳管或碳黑裸露於聚苯胺結構外的現象,若碳管表面有接枝官能基團,則碳管裸露情形明顯減低。
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
Appears in Collections:材料科學與工程學系

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