Morphological changes of carbon nanotubes in polyethylene matrices under oscillatory tests as determined by dielectrical measurements
Source abstract
Abstract
Abstract By combining a high sensitive dielectric sensor into a parallel plate rheometer, the time evolution of the dielectric properties of polyethylene/carbon nanotube composites was measured in the molten state under oscillatory shear. Composites with single- (SWCNT) or multiwall (MWCNT) carbon nanotubes initially decrease its conductivity proportional to the oscillatory shear-strain applied. After this initial drop, some composites increase the conductivity under these non-quiescent conditions reflecting a possible shear-induced agglomeration process. The latter based on the complex permittivity spectrum showing a shortening in the CNT–CNT distances in these composites after shear. At concentrations below the electrical percolation threshold, the presence of both SWCNTs and MWCNTs reduces the DC conductivity of the molten matrices. This result shows that carbon nanotubes can act as a scavenger for impurities or additives present in commercial polyethylenes.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Carbon Nanotubes in Composites · Dielectric materials and actuators · High voltage insulation and dielectric phenomena
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (40)
Show source-provided references
1. Carbon nanotubes: synthesis and properties, electronic devices and other emerging applications10.1179/174328004X5655 ↗
2. Thermal and mechanical properties of single-walled carbon nano tubes-polypropylene composites prepared by melt processing10.1016/j.carbon.2005.01.031 ↗
3. Surfactant-assisted processing of carbon nanotube/polymer composites10.1021/cm9906396 ↗
4. Crystallization and orientation studies in polypropylene/single wall carbon nanotube composite10.1016/S0032-3861(03)00073-9 ↗
5. Flow-induced properties of nanotube-filled polymer materials10.1038/nmat1183 ↗
6. Characterization of melt flow instabilities in polyethylene/carbon nanotube composites10.1016/j.polymer.2010.06.016 ↗
7. Thermal degradation and flammability properties of poly(propylene)/carbon nanotube composites10.1002/1521-3927(20020901)23:13<761::AID-MARC761>3.0.CO;2-K ↗
8. Low percolation threshold in single-walled carbon nanotube/high density polyethylene composites prepared by melt processing technique10.1016/j.carbon.2005.09.039 ↗
9. Shear-induced conductor-insulator transition in melt-mixed polypropylene-carbon nanotube dispersions10.1103/PhysRevB.76.195420 ↗
10. Conductivity spectroscopy on melt processed polypropylene-multiwalled carbon nanotube composites: Recovery after shear and crystallization10.1016/j.polymer.2006.12.035 ↗
11. Influence of shear deformation on carbon nanotube networks in polycarbonate melts: Interplay between build-up and destruction of agglomerates10.1016/j.polymer.2009.11.047 ↗
12. Destruction and formation of a conductive carbon nanotube network in polymer melts: in-line experiments10.1016/j.polymer.2008.01.073 ↗
13. Destruction and formation of a carbon nanotube network in polymer melts: rheology and conductivity spectroscopy10.1016/j.polymer.2008.05.037 ↗
14. Effect of nanotube alignment on percolation conductivity in carbon nanotube/polymer composites10.1103/PhysRevB.72.121404 ↗
15. Orientation of carbon nanotubes in a sheared polymer melt10.1063/1.1562161 ↗
16. Dispersion, agglomeration, and network formation of multiwalled carbon nanotubes in polycarbonate melts10.1016/j.polymer.2007.12.024 ↗
17. Shear-stimulated formation of multi-wall carbon nanotube networks in polymer melts10.1002/pssb.200982265 ↗
18. Shear-controlled electrical conductivity of carbon nanotubes networks suspended in low and high molecular weight liquids10.1016/j.polymer.2010.09.013 ↗
19. Single-wall carbon nanotubes with diameters approaching 6nm obtained by laser vaporization10.1016/S0008-6223(01)00119-1 ↗
20. Polymer motion as detected via dielectric spectra of 1,4-cis-polyisoprene under large amplitude oscillatory shear (LAOS)10.1016/j.jnnfm.2009.03.002 ↗
21. Effect of large amplitude oscillatory shear (LAOS) on the dielectric response of 1, 4-cis-polyisoprene10.1016/j.polymer.2006.03.116 ↗
22. On the determination of electrical conductivity in polyethylene10.1088/0022-3727/14/8/015 ↗
23. The extrinsic nature of electrical conductivity in polyethylene10.1002/pol.1967.110050213 ↗
24. Charge transport modeling in insulating polymers: From molecular to macroscopic scale10.1109/TDEI.2005.1522182 ↗
25. Absorption and conduction currents in polymers – a unified model10.1088/0022-3727/23/2/011 ↗
26. Space-charge-controlled conductivity in low-density polyethylene10.1063/1.1559656 ↗
27. Carbon nanotubes: synthesis, integration, and properties10.1021/ar0101640 ↗
28. Nanotube molecular wires as chemical sensors10.1126/science.287.5453.622 ↗
29. Conductivity enhancement of carbon nanotube and nanofiber-based polymer nanocomposites by melt annealing10.1016/j.polymer.2008.08.057 ↗
30. Bottom-up synthesis of PS-CNF nanocomposites10.1016/j.polymer.2004.11.091 ↗
31. Carbon black networking in elastomers monitored by dynamic mechanical and dielectric spectroscopy10.1002/mame.200700228 ↗
32. CNT based elastomer-hybrid-nanocomposites with promising mechanical and electrical properties10.1002/mame.200900131 ↗
33. Analysis of carbon black networking in elastomers by dielectric spectroscopy10.1103/PhysRevB.75.054202 ↗
34. Kramer · 2003
35. Transport properties of the composite-material carbon-poly(vinyl chloride)10.1103/PhysRevB.18.5712 ↗
36. Dielectric spectroscopy on melt processed polycarbonate—multiwalled carbon nanotube composites10.1016/S0032-3861(03)00451-8 ↗
37. Nonequilibrium phase diagram of sticky nanotube suspensions10.1103/PhysRevLett.97.036101 ↗
38. Rheology of concentrated carbon nanotube suspensions10.1063/1.2711176 ↗
39. Fourier-Transform rheology10.1002/1439-2054(20020201)287:2<83::AID-MAME83>3.0.CO;2-B ↗
40. Flocculation in simulations of sheared fiber suspensions10.1016/j.ijmultiphaseflow.2003.10.005 ↗