| 초록 |
It has been known that cavitation caused by strong ultrasonic wave generates microbubbles in liquids. The microbubbles continue to grow during compression/rarefaction cycles. When they reach a critical size, they collapse by giving off enormous energy, resulted from shock wave. Also it has been known that the ultrasonic cavitation causes the degradation of polymeric chains in liquids. When polymer chains experience the strong cavitation, the middle of the chains is severed with terminal radicals on polymer chain ends. With this background, multiwalled carbon nanotubes (MWCNTs) were modified with water soluble polymer, poly(vinyl alcohol, PVA). Using radical scavenging effect of MWCNT, PVA was surface-grafted onto MWCNT by simple sonication. The grafting of PVA was thoroughly investigated and the dispersion of modified MWCNT in PVA film was studied. Finally, the physical properties of modified MWCNT/PVA composites were investigated. |
