| 초록 |
The influence of the shear on the percolation network of carbon nanotubes (CNTs) in CNT/polymer composites is studied using Monte Carlo (MC) simulations and a percolation theory. The percolation behavior of CNTs is crucial to electrical conductivity of CNT/polymer composites, but it has been reported that such behavior has deteriorated due to the shear. In this work, the shear, which is mimicked by implementing the biased potential, is exerted on the composite of CNT/polymer. Upon the imposition of shear, CNTs lie parallel to the shear direction and their distribution within the composite is also altered significantly. After a certain time, however, the shear leads the CNTs to get entangled forming clusters, which breaks down the percolating network of CNTs, if any, and decreases the electric conductivity of the composite. We carry out MC simulations changing the shear rate, the CNT aspect ratio, and the CNT concentration and obtain a pseudo-phase diagram for the cluster formation. |
