Thermal decomposition behavior and durability evaluation of thermotropic liquid crystalline polymers

Sang Mi Shin, Seong Hun Kim, Jun Kwang Song

Research output: Contribution to journalArticle

12 Citations (Scopus)

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 Jan 1

Fingerprint

Liquid crystal polymers
Hydroxybenzoates
Durability
Pyrolysis
Heating rate
Acids
Activation energy
Degradation
Xenon
Polyethylene Terephthalates
Polyesters
Ultraviolet radiation
Hydroxyl Radical
Surface morphology
Thermogravimetric analysis
Atmospheric humidity
Thermodynamic stability
Nitrogen
Color
Radiation

Keywords

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

Cite this

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Thermal decomposition behavior and durability evaluation of thermotropic liquid crystalline polymers. / Shin, Sang Mi; Kim, Seong Hun; Song, Jun Kwang.

In: Macromolecular Research, Vol. 17, No. 3, 01.01.2009, p. 149-155.

Research output: Contribution to journalArticle

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