Abstract
Structure formation, break-down, orientation, and recovery in a multiwalled carbon nanotube (MWCNT)-polyethylene oxide nanocomposite above the percolation threshold were investigated using oscillatory and rotational rheometric studies. It was found that above the percolation threshold a percolating cluster is formed in the mixture, which is broken down upon application of a shearing force greater than a critical value. The critical value depends on both temperature and concentration of MWCNT particles in the polymer matrix. No full recovery of the structure was observed, even after 3600 s of rest time. This was attributed to a very high tendency of the MWCNT particles to reaggregate and the high strength of the primary percolating cluster formed during the recovery process. A generalized mechanism was proposed for the breakdown and recovery of the clusters of the MWCNT particles which can explain the observations for different kinds of matrices and dispersed particles.
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