Pyrolysis - capillary gas chromatography combined with on-line alkylation for the compositional analysis of liquid crystalline aromatic polyesters

✍ Scribed by Ohtani, Hajime ;Fujii, Ryuichi ;Tsuge, Shin

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: English
• Weight: 328 KB
• Volume: 14
• Category: Article
• ISSN: 0935-6304
• DOI: 10.1002/jhrc.1240140607

✦ Synopsis

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-hydroxybenroic acid, terephthalic acid, and 4,4'-biphenol and every constituent of a sample weighing cam 50 pg was almost quantitatively recovered as its dimethyl derivative in the pyrogram obtained following pyrolysis at 400°C in the presence of 1 pl of 25 YO tetramethylammonium 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 determined by pyrolysis-methylation GC.