writer：Defeng Wu, Liang Wu, Ming Zhang.
keywords：carbon nanotube; poly(butylene terephthalate); nanocomposites; rheology.
source：期刊
specific source：Journal of Polymer Science Part B: Polymer Physics
Issue time：2007年

Journal of Polymer Science Part B: Polymer Physics, 2007, 45, 2239-2251.

ABSTRACT:

Multi-walled carbon nanotube/Poly(butylene terephthalate) nanocomposites (PCTs) were prepared by melt compounding. The microstructure of PCTs was investigated using TEM and FT-IR. The linear and nonlinear as well as transient rheological properties of PCTs were characterized by the parallel plate rheometer. The results reveal that the surface modification can improve the dispersion state of nanotube in matrix. PCTs present a low percolation threshold of about 1-2wt% in contrast to that of PBT/clay nanocomposites. The network structure is very sensitive to both the quiescent and large amplitude oscillatory shear (LAOS) deformation, and is also to the temperature, which makes the principle of time-temperature superposition (TTS) be valid on PCTs only in a very restricted temperature range. The stress overshoots to the reverse flow are strongly dependent on both the rest time and shear rate but show a strain-scaling response to the startup of steady shear, indicating that the broken network can reorganize even under quiescent condition. The nanotube may experience the long-range, more or less order during annealing process.

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http://www3.interscience.wiley.com/journal/114286296/abstract