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Journal of Polymer Research

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01-04-2013 | Original Paper

Proof of ether-bridged condensation products in UF resins by 2D NMR spectroscopy

Authors: Éléonore J. Kibrik, Oliver Steinhof, Günter Scherr, Werner R. Thiel, Hans Hasse

Published in: Journal of Polymer Research | Issue 4/2013

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Abstract

The existence of ether-bridged condensation products in urea-formaldehyde (UF) resins is still disputed in the literature as these products have never been isolated or fully characterized. Using ¹H-¹⁵N gradient heteronuclear single quantum correlation (gHSQC) experiment, ¹H-¹³C gHSQC experiment and ¹H-¹³C gradient heteronuclear multiple bond correlation (gHMBC) experiment a, methylolurea hemiformal compound (urea compound with oligomeric chains \(-\rm{CH}_{2}\;{\rm O[CH}_{2}{\rm O]}{\mathrm {n}}{\rm H}\) and \(n\geq 1\)) and a symmetrical compound, most likely an ether-bridged condensation product, in a UF resin sample were characterized. The results were confirmed by 2D NMR ¹³C-¹³C gradient correlated spectroscopy (gCOSY) experiment using ¹³C labeled ureaformaldehyde samples. Spectroscopic chemical shifts of the proposed ether-bridged condensation product in ¹⁵N, ¹³C, ¹H NMR spectroscopy were assigned. Furthermore, individual peak assignments are provided for the methylolurea hemiformal moiety.

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Title: Proof of ether-bridged condensation products in UF resins by 2D NMR spectroscopy
Authors: Éléonore J. Kibrik
Oliver Steinhof
Günter Scherr
Werner R. Thiel
Hans Hasse
Publication date: 01-04-2013
Publisher: Springer Netherlands
Published in: Journal of Polymer Research / Issue 4/2013
Print ISSN: 1022-9760
Electronic ISSN: 1572-8935
DOI: https://doi.org/10.1007/s10965-013-0079-7

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