Gabriel Y.H. Choong
Viscoelastic melt rheology and time-temperature superposition of polycarbonate – multi-walled carbon nanotube nanocomposites
Choong, Gabriel Y.H.; De Focatiis, Davide S.A.; Hassell, David G.
Abstract
This work investigates the linear and non-linear viscoelastic melt rheology of four grades of polycarbonate melt-compounded with 3 wt% Nanocyl NC7000 multi-walled carbon nanotubes and of the matching matrix polymers. Amplitude sweeps reveal an earlier onset of non-linearity and a strain overshoot in the nanocomposites. Mastercurves are constructed from isothermal frequency sweeps using vertical and horizontal shifting. Although all nanocomposites exhibit a second plateau at ~105 Pa, the relaxation times estimated from the peak in loss tangent are not statistically different from those of pure melts estimated from cross-over frequencies: all relaxation times scale with molar mass in the same way, evidence that relaxation of the polymer network is the dominant mechanism in both filled and unfilled materials. Non-linear rheology is also measured in large amplitude oscillatory shear. A comparison of the responses from frequency and amplitude sweep experiments reveals the importance of strain and temperature history on the response of such nanocomposites.
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 12, 2013 |
Online Publication Date | May 26, 2013 |
Deposit Date | Sep 4, 2017 |
Publicly Available Date | Sep 4, 2017 |
Journal | Rheologica Acta |
Print ISSN | 0035-4511 |
Electronic ISSN | 0035-4511 |
Publisher | Springer Verlag |
Peer Reviewed | Peer Reviewed |
Volume | 52 |
Issue | 8 |
DOI | https://doi.org/10.1007/s00397-013-0706-6 |
Keywords | Polycarbonate, Multi-walled carbon nanotubes, Melt rheology, Linear viscoelasticity, Non-linear viscoelasticity, Time–temperature superposition |
Public URL | https://nottingham-repository.worktribe.com/output/714973 |
Publisher URL | http://link.springer.com/article/10.1007%2Fs00397-013-0706-6 |
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Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0
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