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Titration of aldehydes present in poly(ethylene terephthalate)
Author(s) -
Villain Franck,
Coudane Jean,
Vert Michel
Publication year - 1994
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1994.070520106
Subject(s) - acetaldehyde , colorimetry , derivatization , formaldehyde , gas chromatography , titration , chemistry , ethylene , chromatography , crystallinity , colorimetric analysis , organic chemistry , high performance liquid chromatography , catalysis , ethanol , crystallography
Aldehydes are known to be present in PET performs and PET bottles. However, the analysis of these aldehydes is difficult because of the high crystallinity of PET and because of its insolubility in common solvents. Titration of acetaldehyde was investigated comparatively by four different methods: by the solid/gas headspace technique (s/g HG), accepted industrially as the standard method, by colorimetry, based on complexation with pararosaniline dye, by colorimetry, based on derivatization as 2,4‐dinitrophenyhydrazones, and by headspace liquid/gas chromatography (1/g HS). Similar results were achieved by the last three methods. In contrast, the standard solid/gas headspace chromatography yielded data that was one order of magnitude smaller. The presence of formaldehyde in PET performs was detected by liquid/gas headspace Chromatography only. © 1994 John Wiley & Sons, Inc.