Thermal degradation and combustion process of liquid crystalline polyesters studied by directly coupled thermal analysis-mass spectrometry

Thermal degradation and combustion processes of commercial liquid crystalline polyesters (LCPs) were studied by directly coupled thermal analysis-mass spectrometry (TA-MS) under inert and quasi-air atmosphere. The first major degradation step of LCPs was the ester linkage rupture reaction. In the ca...

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Bibliographic Details
Published inJournal of analytical and applied pyrolysis Vol. 37; no. 2; pp. 173 - 183
Main Authors Sato, Hiroaki, Kikuchi, Tadashi, Koide, Naoyuki, Furuya, Keiichi
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.1996
Subjects
Flame resistance
Liquid crystalline polyesters
Pyrolysis
Thermal analysis-mass spectrometry
Thermal degradation
Pyrolysis
Flame resistance
Liquid crystalline polyesters
Thermal analysis-mass spectrometry
Thermal degradation
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Summary:Thermal degradation and combustion processes of commercial liquid crystalline polyesters (LCPs) were studied by directly coupled thermal analysis-mass spectrometry (TA-MS) under inert and quasi-air atmosphere. The first major degradation step of LCPs was the ester linkage rupture reaction. In the case of fully aromatic LCPs, this process was little influenced by 20% oxygen atmosphere. The main evolved gaseous products at this step were CO, CO 2, H 2O and phenol for fully aromatic LCP samples, in addition, aliphatic products for a semi-aromatic LCP sample. Evolution of CO 2 was followed by that of flammable organic products for fully aromatic LCPs, while flammable organic products evolved prior to CO 2 for semi-aromatic LCP. The flame resistant and self-extinguishing mechanisms of LCPs are discussed on the basis of their thermal degradation behavior.
ISSN:0165-2370
1873-250X
DOI:10.1016/0165-2370(96)00944-8