Effect of Carbon Nanofiber Structure on Crystallization Kinetics of Polypropylene/Carbon Nanofiber Composites
- Effect of Carbon Nanofiber Structure on Crystallization Kinetics of Polypropylene/Carbon Nanofiber Composites
- 이성호; 한재량; 구본철; 김준경
- polypropylene; carbon nanofibers; DSC; TEM; STM
- Issue Date
- Bulletin of the Korean Chemical Society
- VOL 32, NO 7, 2369-2376
- 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 °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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