Solvent Extraction - Nuclear Magnetic Resonance Spectroscopy NMR

16 Solvent Extraction - Nuclear Magnetic Resonance Spectroscopy (NMR) [Pg.130]

HPLC followed by NMR spectroscopy has been used to determine PS oligomers in the molecular weight range up to 4800 in PS [131] -hexane-tetrahydrofuran or -hexane-methylene dichloride were used as eluting solvents. [Pg.130]

The choice of solvent for NMR analysis is important. Carhon disnlfide and deuterated acetonitrile were nsed hy Carlson and co-workers [132]. If the acetonitrile extract contained more than one antioxidant, the improper choice of solvent may lead to selective dissolution of the antioxidants. Comparison of the unknown and reference NMR spectra should only be done if both spectra were obtained using the same solvent. The NMR spectra of antioxidants will change in different solvents. [Pg.131]

E Schabron and D.Z. Bradfield, Journal of Applied Polymer Science, 1981,26, [Pg.131]

E Zilio-Grande, G. Libralesso, A. Perazzolo, G. Sassu and G. Sveglidao, Materie Plastiche ed Elastomeri, 1964, 30, 7, 643. [Pg.131]

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