ISSN:
1436-2449
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Summary Homo- and copolyesters made up by terephtalic acid (T) on the one hand, and ethylene glycol (Et), diethylene glycol (Di), triethylene glycol (Tr), 1,4-butanediol (Bu) and 1,6-hexanediol (He), on the other hand, were investigated by means of 60, 90, 250 and 400 MHz 1H-NMR spectra or by 22.63 MHz 13C-NMR spectra. Copolyesters of ethylene, glycol and oligo(ethylene glycols) can be analyzed by means of 1H-NMR spectra because of the fact that the terephthalic acid protons are sensitive to sequence effects, while the 13C-NMR signals are insensitive. In contrast, sequences of ethylene glycol and 1,4-butanediol or 1,6-hexanediol are best analyzed by 13C-NMR spectra, while 1H-NMR spectra are rather useless in this case.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00284068
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