| 초록 |
Multi-walled carbon nanotubes (MWNTs) were oxidized by concentrated HNO3 and H2SO4 to introduce carboxylic groups onto MWNT surfaces. The oxidized MWNTs (MWNT-COOH) were converted into acyl chloride functionalized MWNTs (MWNT-COCl) by reacting with neat thionyl chloride (SOCl2). MWNT-COCl was then reacted with excess ethylene glycol, producing MWNT-g-poly(urethane-urea) supported initiators (MWNT-OH). MWNT-NH2 were synthesised by Friedel-Crafts reaction. Different types of conductive fillers (MWNT-g-poly(urea-urethane), MWNT-COOH, MWNT-NH2) were blended with polyurethane dispersion (PUD) to form partially conductive polymer composites. TGA and DSC were utilized to characterize the thermal behavior of the nanocomposites compared to PUD. The chemical structure of the nanocomposites of MWNT and PUD was analyzed by FT-IR and Raman spectroscopies. The microstructure and the MWNT distribution in the nanocomposite was observed with SEM, TEM and AFM. |
