Quantitative 13C n.m.r. characterization of aqueous formaldehyde resins: 2. Resorcinol-formaldehyde resins
1986; Elsevier BV; Volume: 27; Issue: 5 Linguagem: Inglês
10.1016/0032-3861(86)90136-9
ISSN1873-2291
Autores Tópico(s)Advanced NMR Techniques and Applications
Resumo13C n.m.r. chemical shift assignments of resorcinol-formaldehyde (RF) reaction products have been made to fill many of the voids in the literature, particularly for base-catalysed RF resins and the aromatic carbons in acid-catalysed RF resins. Nuclear Overhauser enhancement (NOE) factors have been determined for relevant carbons. Quantitative results using these factors appear to be very accurate. Applications of these assignments and quantitative data to the structural characterization of commercial and experimental RF resins are discussed. The results of this study allow more accurate detailed studies of the nature of various RF reactions and provide an extensive data base for future solid-state n.m.r. studies.
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