| PC |
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Model matrix to inspect the effect of CNT introduction on the rheological behavior of polymer-based nanocomposites [45,46,47,48].
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The introduction of CNTs caused the appearance of a non-terminal behavior related to a liquid-to-solid transition due to a combined filler/filler–polymer/filler network [49].
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The utilization of low molar mass PC had a beneficial effect on the kinetics of network formation [55].
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| PE |
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A selective adsorption of the high molar mass fraction of PE chains onto the CNT surface was observed, causing a decrease in the entanglement density in the bulk material and a consequent lowering of the viscosity values in the composite systems [58,59,60].
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The Cox–Merz rule was not valid [59,61].
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In PEs with high molecular weights and broad molar mass distributions, the macromolecular architecture of the matrix was the main factor controlling the material rheological behavior, as the effects caused by the nanotube network were screened [62].
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| PP |
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Higher viscosity and modulus values as a function of CNT loading and a transition from liquid-like to solid-like behavior as the nanofiller content increases were observed [69,70,71,75,78].
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The formation of a percolative network was promoted by subjecting PP/CNT composites to a thermal treatment [72].
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PP matrices with high molar masses, able to develop high shear stresses during the flow, induced a preferential orientation of CNTs during the melt flow into a capillary, causing a decrease in the nanocomposite flow resistance and a consequent lowering of the material viscosity [74].
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| PS |
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In the case of functionalized CNTs, low amounts of nanofiller exerted a plasticizing action, reducing the matrix viscosity [85].
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In general, composites obtained through solution-mixing exhibited improved complex viscosities and lower percolation thresholds with respect to their melt-mixed counterparts, accounting for a general better dispersion of nanofillers and higher length of CNTs [89,90].
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| PA |
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A remarkable increase in complex viscosities and dynamic moduli, together with the disappearance of the terminal behavior, marking the transition from liquid-like to solid-like viscoelastic response was observed [92].
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■
The incorporation of CNTs resulted in a higher activation energy for the polymer flow process [93].
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| Biopolymers |
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A significant modification of the low-frequency relaxation of polymer chains, resulting from the interference of the CNT percolated network with the long-range motion of polymer macromolecules, was recorded [98,99,100].
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■
In the case of PCL-based nanocomposites, a remarkable influence of the processing conditions on the material rheological response was observed [101].
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