Determination of average molecular weights of high-boiling aromatic oil fractions by 13C and 1H nuclear magnetic resonance
✍ Scribed by Bernard Rousseau; Alain H. Fuchs
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 482 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0016-2361
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## Abstract Copolyesters with different stoichiometric compositions, obtained from 1,4‐butanediol, adipic acid, and terephthalic acid by molten‐state polycondensation, are studied by means of high resolution ^13^C NMR spectroscopy with respect to copolymer composition and block length distribution.
A detailed structural analysis of the copolyesterification in bulk without any external catalyst at 160ЊC between o-phthalic anhydride (P), oleic acid (O), and trimethylolpropane (T) with a mol ratio ([{COOH]/[{OH]) Å 0.70 has been carried out by high resolution 13 C nuclear magnetic resonance ( 13