Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Effect of Carbon Nanofiber Structure on Crystallization Kinetics of Polypropylene/Carbon Nanofiber Composites

  • Lee, Sung-Ho (Institute of Advanced Composites Materials, Korea Institute of Science and Technology) ;
  • Hahn, Jae-Ryang (Department of Chemistry and Research Institute of Physics and Chemistry, Chonbuk National University) ;
  • Ku, Bon-Cheol (Institute of Advanced Composites Materials, Korea Institute of Science and Technology) ;
  • Kim, Jun-Kyung (Institute of Advanced Composites Materials, Korea Institute of Science and Technology)
  • Received : 2011.01.17
  • Accepted : 2011.05.31
  • Published : 2011.07.20
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Abstract

Effect of heat treatment of carbon nanofibers (CNF) on electrical properties and crystallization behavior of polypropylene was reported. Two types of CNFs (untreated and heat treated at 2300 $^{\circ}C$) were incorporated into polypropylene (PP) using intensive mixing. A significant drop in volume resistivity was observed with composites containing untreated 5 wt % and heat treated 3 wt % CNF. In non-isothermal crystallization studies, both untreated and heat treated CNFs acted as nucleating agents. Composites with heat treated CNFs showed a higher crystallization temperature than composites with untreated CNFs did. TEM results of CNF revealed that an irregular structure of CNFs can be converted into the continuous graphitic structure after heat treatment. Furthermore, STM showed that the higher carbonization temperature leads to the higher graphite degree which presents the larger carbon network size, suggesting that a more graphitic structure of CNFs led to a higher crystallization temperature of PP.

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