Viscoelastic melt rheology and time-temperature superposition of polycarbonate – multi-walled carbon nanotube nanocomposites
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...
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| Format: | Article |
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Springer
2013
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| Online Access: | https://eprints.nottingham.ac.uk/2177/ |
| _version_ | 1848790726625722368 |
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| author | Choong, Gabriel Y.H. De Focatiis, Davide S.A. Hassell, David G. |
| author_facet | Choong, Gabriel Y.H. De Focatiis, Davide S.A. Hassell, David G. |
| author_sort | Choong, Gabriel Y.H. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T18:17:12Z |
| format | Article |
| id | nottingham-2177 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T18:17:12Z |
| publishDate | 2013 |
| publisher | Springer |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-21772020-05-04T16:36:49Z https://eprints.nottingham.ac.uk/2177/ 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. 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. Springer 2013-05-26 Article PeerReviewed Choong, Gabriel Y.H., De Focatiis, Davide S.A. and Hassell, David G. (2013) Viscoelastic melt rheology and time-temperature superposition of polycarbonate – multi-walled carbon nanotube nanocomposites. Rheologica Acta, 52 (8). pp. 801-814. ISSN 0035-4511 Polycarbonate Multi-walled carbon nanotubes Melt rheology Linear viscoelasticity Non-linear viscoelasticity Time–temperature superposition http://link.springer.com/article/10.1007%2Fs00397-013-0706-6 doi:10.1007/s00397-013-0706-6 doi:10.1007/s00397-013-0706-6 |
| spellingShingle | Polycarbonate Multi-walled carbon nanotubes Melt rheology Linear viscoelasticity Non-linear viscoelasticity Time–temperature superposition Choong, Gabriel Y.H. De Focatiis, Davide S.A. Hassell, David G. Viscoelastic melt rheology and time-temperature superposition of polycarbonate – multi-walled carbon nanotube nanocomposites |
| title | Viscoelastic melt rheology and time-temperature superposition of polycarbonate – multi-walled carbon nanotube nanocomposites |
| title_full | Viscoelastic melt rheology and time-temperature superposition of polycarbonate – multi-walled carbon nanotube nanocomposites |
| title_fullStr | Viscoelastic melt rheology and time-temperature superposition of polycarbonate – multi-walled carbon nanotube nanocomposites |
| title_full_unstemmed | Viscoelastic melt rheology and time-temperature superposition of polycarbonate – multi-walled carbon nanotube nanocomposites |
| title_short | Viscoelastic melt rheology and time-temperature superposition of polycarbonate – multi-walled carbon nanotube nanocomposites |
| title_sort | viscoelastic melt rheology and time-temperature superposition of polycarbonate – multi-walled carbon nanotube nanocomposites |
| topic | Polycarbonate Multi-walled carbon nanotubes Melt rheology Linear viscoelasticity Non-linear viscoelasticity Time–temperature superposition |
| url | https://eprints.nottingham.ac.uk/2177/ https://eprints.nottingham.ac.uk/2177/ https://eprints.nottingham.ac.uk/2177/ |