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Determination of the structural configuration of cresol–novolak resins by 13C NMR spectroscopy
Article first published online: 9 MAR 2003
Copyright © 1982 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 27, Issue 9, pages 3449–3454, September 1982
How to Cite
Carothers, J. A., Gipstein, E., Fleming, W. W. and Tompkins, T. (1982), Determination of the structural configuration of cresol–novolak resins by 13C NMR spectroscopy. J. Appl. Polym. Sci., 27: 3449–3454. doi: 10.1002/app.1982.070270921
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Accepted: 15 MAR 1982
- Manuscript Received: 23 DEC 1981
13C NMR spectroscopy was used to investigate the structures of a series of pure isomeric cresylic novolak resins. Chemical shifts were measured and assigned, and end groups were distinguished from the central repeat units of the chains. Based on these measurements, the number average molecular weight of the para-cresylic oligomer was determined. A comparison of the 13C decoupled and coupled spectra of the three isomeric resins indicates that the para isomer has a linear, ordered structure in which the aromatic rings are linked only by ortho–ortho′ methylene-bridging groups. The structures of the ortho and meta isomers are more complex and contain ortho–ortho′, ortho–para′, and para–para′ methylene bridges.