Thermal decomposition behavior of carbon nanotube reinforced thermotropic liquid crystalline polymers

Authors

  • Sang Ho Park,

    1. Department of Fiber and Polymer Engineering, College of Engineering, Hanyang University, Sungdong-gu, Seoul 133-791, Korea
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  • Seung Goo Lee,

    1. Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, Yuseong-gu, Daejeon 305-764, Korea
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  • Seong Hun Kim

    Corresponding author
    1. Department of Fiber and Polymer Engineering, College of Engineering, Hanyang University, Sungdong-gu, Seoul 133-791, Korea
    • Department of Fiber and Polymer Engineering, College of Engineering, Hanyang University, Sungdong-gu, Seoul 133-791, Korea
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Abstract

Thermotropic liquid crystalline polymers (TLCP), 4-hydroxybenzoic acid (HBA)/6-hydroxyl-2-naphthoic acid (HNA) copolyester, and HNA/hydroxylbenzoic acid (HAA)/terephthalic acid (TA) copolyester reinforced by carbon nanotube (CNT) were prepared by melt compounding using Hakke internal mixer. The thermal behavior and degradation of CNT reinforced HBA/HNA copolyester and HNA/HAA/TA copolyester have been investigated by dynamic thermogravimetric analysis under nitrogen atmosphere in the temperature range 30 to 800°C to study the effect of CNT on the thermal decomposition behavior of the TLCP/CNT nanocomposites. The thermal decomposition temperature at the maximum rate, residual yield, integral procedural decomposition temperature, and activation energy for thermal decomposition was studied to investigate thermal stability of TLCP/CNT nanocomposites. The thermal stability of CNT reinforced HBA/HNA copolyester was increased by addition of a very small quantity of CNT and the residual weight was 42.4% and increased until 50.8% as increasing CNT contents. However, the thermal stability of CNT reinforced HNA/HAA/TA copolyester was decreased initially when a very small quantity of CNT added. The residual weight was decreased from 50.4% to 45.1%. After addition of CNTs in the TLCP matrix, the thermal stability of CNT reinforced HNA/HAA/TA copolyester increased as increasing content of CNT and the residual weight was increased until 53% as increasing CNT contents. The activation energy was calculated by multiple heating rate equations such as Friedman, Flynn-Wall-Ozawa, Kissinger, and Kim-Park methods to confirm the effect of CNT in two different TLCP matrices. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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