Electrical and mechanical properties as a processing condition in polyvinylchloride multi walled carbon nanotube composites.
We investigated the electrical conductivity (sigma) and mechanical property of polyvinylchloride/carbon nanotube composites as a function of the CNT content and processing time during a solid-state process of high speed vibration mixing (HSVM) and high energy ball milling (HEBM). Both processes were suggested to avoid high temperatures, solvents, chemical modification of carbon nanotubes. In this study, the percolation threshold (phi(c)) for electrical conduction is about 1 wt% CNT with a sigma value of 0.21 S/m, and the electrical conductivity is higher value than that reported by other researchers from melt mixing process or obtained from the other solid-state processes. We found that the dispersion of CNTs and morphology change from CNT breaking are closely related to sigma. Especially, a large morphology change in the CNTs was occurred at the specific processing time, and a significant decrease in the electrical conductivity of polyvinylchloride/carbon nanotube composite occurred in this condition. A meaningful increase of electrical properties and mechanical property is observed in the sample with about 1-2 wt% CNT contents sintered at 200 degrees C after the milling for 20 min by HEBM process. Our study indicates the proper process condition required to improve sigma of PVC/CNT composites.
Department of Nano Fusion Technology, College of Nanoscience and Nanotechnology, Pusan National University, 50 Cheonghak-ri, Samnangjin-eup, Miryang-si, Kyongnam 627-706, Korea.
Byung Ju
BJ
Song
Jin Woo
JW
Ahn
Kwon Koo
KK
Cho
Jae Seung
JS
Roh
Dong Yun
DY
Lee
Yong Suk
YS
Yang
Jae Beom
JB
Lee
Dae Youn
DY
Hwang
Hye Sung
HS
Kim
D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D004574:Electromagnetic Fields; D006244:Hardness; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D011143:Polyvinyl Chloride / Q000737:chemistry*; D013499:Surface Properties; D013718:Tensile Strength; D014732:Vibration
D046911:Macromolecular Substances; D037742:Nanotubes, Carbon; D011143:Polyvinyl Chloride