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Korea-Australia rheology journal v.22 no.2, 2010년, pp.89 - 94   SCIE 피인용횟수: 2
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Dispersion of entangled carbon nanotube by melt extrusion

Oh, Joo-Seok    (School of Chemical and Biological Engineering, Seoul National University   ); Ahn, Kyung-Hyun    (School of Chemical and Biological Engineering, Seoul National University   ); Hong, Joung-Sook    (Department of Chemical and Environmental Engineering, Soongsil University  );
  • 초록

    This paper investigates the dispersion of carbon nanotube (CNT) in a polymer melt during iterative extrusion by measuring electrical and rheological properties. 2 wt% CNT as received was mixed with polymer (low density polyethylene) through twin screw extruder. The extrusion was iteratively performed at the same process condition. At the same time, the rheological and electrical properties were measured. We expected the mixing energy applied on entangled CNT increases with process time, which improves the CNT dispersion. The electrical property of intermediate composite was effectively improved by iterative extrusion. After the fifth extrusion, CNT/LDPE composite reached to the conductive electric level (surface resistance ${\leq}E+5\;{\Omega}/sq$ ). Also, the rheological properties of composite were increased according to CNT dispersion. Especially the rheological properties over lower frequency region were significantly increased by the dispersed nanotube. This paper suggests that the dispersion by only iterative mixing process results in a disentanglement of CNT and they forms an electrically useful structure. The rheological and electrical measurements indicate that the CNT disentangled by the iterative mixing method forms a percolation structure.


  • 주제어

    carbon nanotube .   melt extrusion .   surface resistance .   rheology .   dispersion.  

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  • 이 논문을 인용한 문헌 (2)

    1. 2012. "" Korea-Australia rheology journal, 24(3): 221~227     
    2. 2013. "" Korea-Australia rheology journal, 25(1): 1~8     

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