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Phase Transition of Multi-Walled Carbon Nanotube/Polystyrene Composites
Su-Dong Park,Younghwan Kwon,Dayong Teng,Dong-Hee Han,Gwan-Young Choi 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.3
Multi-walled carbon nanotube/polystyrene (MWCNT/PS) composites with various MWCNT compositions were prepared by using a solution process, where MWCNTs were well dispersed with an aid of surfactant. The phase transition of these nanocomposites was examined by using an oscillatory rheometer. The storage modulus, the loss modulus, and the complex viscosity increased with increasing MWCNT composition. Significant changes in the frequency-dependent moduli and complex viscosity were observed between 2 wt% and 5 wt% of MWCNTs, indicating a rheological transition from a viscous to an elastic behavior of the composites with increasing MWCNT composition. This transition at a particular MWCNT concentration could be related to a physical gel formation caused by a combination of entangled MWCNTs and by interactions between MWCNTs and PS chains. The phase transition of the gel point of MWCNT/PS composites was measured to be 3.2 wt% of MWCNTs.
Rheological properties and dispersion of multi-walled carbon nanotube (MWCNT) in polystyrene matrix
Su-Dong Park,Dong-Hee Han,Dayong Teng,Younghwan Kwon 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Rheological phase transition behavior of MWCNT/PS composites with various MWCNT contents was characterized by using a fre-quency sweep experiment with an oscillatory rheometer at 210.C. At 210.C, it revealed that the MWCNT content at the rheologicalphase transition of MWCNT/PS composites with dierent contents of dispersing agent was measured to be 3.6 wt% for MWCNT/PScomposite without dispersing agent, 3.0 wt% for the composite with 10 wt% of dispersing agent, and 3.2 wt% for the composite with20 wt% of dispersing agent. This rheological transition could be related to a physical gel formation of the composites, providing an alter-native way to determine the degree of dispersion of MWCNTs in the composites.