Structure and flow behavior of dilute dispersions of carbon nanotubes in polyacrylonitrile–dimethylsulfoxide solution
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Rheological behavior of carbon nanotubes (at the concentration below the percolation threshold) finely dispersed in semidilute polyacrylonitrile–dimethylsulfoxide solution has been studied as a function of the applied pre-shear stress and discussed in view of possible structural changes induced by pre-shearing of the samples. The observed effects have been ascribed to a combination of processes involving alignment and association of the macromolecules as well as orientation and association of carbon nanotubes. The effects caused by the macromolecules alignment and association are mainly observed at low concentration of the filler and at high shear stress, whereas the processes involving carbon nanotubes reorganization are mainly observed at the higher filler content and at lower pre-shear stress. The nanotubes rearrangement under shear has been probed via hyphenated rheology–synchrotron X-ray small-angle scattering measurement.
KeywordsCarbon nanotubes Alignment Aggregation Rheology Synchrotron Small-angle scattering
We thank the ESRF (European Synchrotron Radiation Facility, Grenoble, France) for granting SAXS beam time (project SC-4167). S.F. acknowledges the Czech Science Foundation (Grant No. 15-10527 J). S.F. also acknowledges the project INGO LG13058. E.K. acknowledges partial financial support from the Russian Foundation for Basic Research (project no. 14-03-31715_mol_a). I.B. acknowledges funding from the Ministry of Education and Science of the Russian Federation (no. 14.577.21.0095 from 25th August 2014); unique identifier RFMEFI57714X0095. Dr. T. Narayanan and Dr. J. Möller are acknowledged for the kind support at the ESRF ID02 beamline.
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Conflict of interest
The authors declare that they have no conflict of interest.
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