ISSN:
0935-6304
Schlagwort(e):
Pyrolysis - gas chromatography
;
Liquid crystalline polyesters
;
On-line alkylation
;
Compositional analysis
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Pyrolysis-capillary gas chromatography combined with on-line alkylation has been employed for compositional analysis of liquid crystalline aromatic polyesters (LCPs) based on p- hydroxybenzoic acid. The fundamental conditions were examined using an LCP prepared from p-hydroxybenzoic acid, terephthalic acid, and 4,4′-biphenol and every constituent of a sample weighing ca. 50 μg was almost quantitatively recovered as its dimethyl derivative in the pyrogram obtained following pyrolysis at 400°C in the presence of 1 μl of 25% tetramethyl-ammonium hydroxide in methanol. The compositions of a variety of terpolyesters and LCPs containing isophthalic acid or 2-hydroxy-6-naphthoic acid units have been precisely deter-mined by pyrolysis-methylation GC.
Zusätzliches Material:
5 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/jhrc.1240140607
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