Thermal decomposition behavior and durability evaluation of thermotropic liquid crystalline polymers

Sang Mi Shin, Seong Hun Kim, Jun Kwang Song

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The thermal decomposition behavior and degradation characteristics of four different thermotropic liquid crystalline polymers (TLCPs) were studied. The thermal decomposition behavior was determined by means of thermogravimetric analysis (TGA) at different heating rates in nitrogen and air. The order of the thermal stability was as follows: multi-aromatic polyester > hydroxybenzoic acid (HBA)/hydroxynaphthoic acid (HNA) copolyester > HNA/ hydroxyl acetaniline (HAA)/terephthalic acid (TA) copolyester > HBA/Poly(ethylene terephthalate) (PET) copolyester. The activation energies of the thermal degradation were calculated by four multiple heating rate methods: Flynn-Wall, Friedman, Kissinger, and Kim-Park. The Flynn-Wall and Kim-Park methods were the most suitable methods to calculate the activation energy. Samples were exposed to an accelerated degradation test (ADT), under fixed conditions of heat (63=3 °C), humidity (30±4%) and Xenon arc radiation (1.10 W/m2), and the changes in surface morphology and color difference with time were determined. The TLCPs decomposed, discolored and cracked upon exposure to ultraviolet radiation.

Original languageEnglish
Pages (from-to)149-155
Number of pages7
JournalMacromolecular Research
Volume17
Issue number3
DOIs
StatePublished - 2009 Mar

Keywords

  • Degradation
  • Durability
  • Thermal decomposition
  • Thermogravimetric analysis (TGA)
  • Thermotropic liquid crystal polymer (TLCP)

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