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대한화학회 제105회 학술발표회 및 총회 Determination of Solubility Parameter of Carbon Nanotubes by Inverse Gas Chromatography

2010년 2월 17일 09시 56분 15초
39P199포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 <발표Ⅳ>
저자 및
임형준, 박종래
서울대학교 재료공학부, Korea
The determination of solubility parameters by inverse gas chromate graphy (IGC) for as-produced and surface functionalized Carbon Nanotubes (CNTs) is discussed. To solve the aggregation problem of CNTs, numerous modification methods have been introduced. However, there is still no systematic study about the dispersion of CNTs. Therefore, to overcome the limitations, the knowledge of the solubility parameter of carbon nanotubes for different CNTs is important for predicting the dispersion behavior of CNTs in solutions and composites. Inverse gas chromatography method is widely used for the characterization of polymers and surfactants that are capable to offer adsorption thermodynamics parameters, dispersive surface tension and solubility parameter. However there are only limited reports about CNTs, especially the surface functionalized ones, because of thermal degradation problems of functional groups in working condition of IGC or inaccurate retention parameters due to the surface characteristics of CNTs. Thus in this research, we found adequate working condition of adjusting IGC to determine the solubility parameters of CNTs. Then under this condition, the solubility parameters of CNTs were found by carrying out IGC. This study confirmed that the IGC method can be successfully applied to determine unknown solubility parameters of various CNTs. Also we found small modification of functional group can greatly affect solubility parameters of CNTs. The determined solubility parameters are well fit with the pre-reported dispersion stability of CNTs. Therefore it is expected that the results obtained in this work would assist in providing a guideline in finding the solubility of CNTs.