writer：Defeng Wu, Yurong Sun, Liang Wu, Ming Zhang.
keywords：carbon nanotube; polypropylene; composites; crystallization; rheology.
source：期刊
specific source：Journal of Applied Polymer Science
Issue time：2008年

Journal of Applied Polymer Science, 2008, 108, 1506-1513.

ABSTRACT:

Multi-walled carbon nanotube/polypropylene composites (PPCNs) were prepared by melt compounding. The linear viscoelastic properties, nonisothermal crystallization behavior and kinetics of PPCNs were respectively investigated by the parallel plate rheometer, differential scanning calorimeter (DSC), X-ray diffractometer (XRD) and polarized optical microscope (POM). PPCNs show the typical non-terminal viscoelastic response due to the percolation of nanotubes. The rheological percolation threshold of about 2wt% is determined using Cole-Cole method. Small addition of nanotube can highly promote crystallization of PP matrix due to the heterogeneous nucleating effect. With increasing nanotube loadings, however, the crystallization rate decreases gradually because the mobility of PP chain is restrained by the presence of nanotube, especially at high loading levels.

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http://www3.interscience.wiley.com/journal/117891817/abstract