Highly branched melamine-phenolic novolaks

Molecular-Level Synthesis of Cobalt Phosphide Nanocrystals Confined in Highly Nitrogen-Doped Mesoporous Carbon Electrocatalyst for Highly Efficient Dye-Sensitized Solar Cells

“…In Figure S1, 13 C nuclear magnetic resonance (NMR) measurements show a signal at 164.5 ppm, indicative of the triazine rings. 45,46 The key signal of 47.8 ppm is also clearly observed, which was attributed to the co-condensation of hydroxymethyl derivatives of resorcinol and amino hydroxymethyl derivatives of melamine. 47 The co-condensation is induced by the reaction of resorcinol's methylol group with the amino hydroxymethyl.…”

“…The melamine is a hexafunctional monomer capable of adding formaldehyde at each of the amine hydrogens to form amino hydroxymethyl (−NHCH 2 OH) derivatives of melamine, and the resorcinol is a trifunctional monomer capable of adding formaldehyde in the 2-, 4-, and 6-ring positions to form the hydroxymethyl (−CH 2 OH) derivatives of resorcinol. In Figure S1, 13 C nuclear magnetic resonance (NMR) measurements show a signal at 164.5 ppm, indicative of the triazine rings. , The key signal of 47.8 ppm is also clearly observed, which was attributed to the co-condensation of hydroxymethyl derivatives of resorcinol and amino hydroxymethyl derivatives of melamine . The co-condensation is induced by the reaction of resorcinol’s methylol group with the amino hydroxymethyl.…”

Co‐polymerization analysis of thermosetting resins using 1H‐15N‐13C triple resonance NMR spectroscopy

“…Ltd. 26 The sample studied by NMR spectroscopy was taken at an intermediate stage of the resin process before any urea was added to resin to eliminate the possibility of melamine-urea co-polymers thus simplifying the NMR spectrum. 20 The other co-polymer cross-peak PMF2 (d 70.0-71.0 ppm/d 6.85-6.95 ppm) was correlated to a carbon with resonance d 43 ppm, which is indicative of a methylene link at the para position. By comparing this NMR spectrum to one obtained from MF reaction products (Figure 1), two new cross-peaks are apparent and are therefore due to co-polymers.…”

“…Figure 10 displays the 1 H-15 N NMR spectrum of the PMF sample. 20 The PMF methylene co-polymer bridges have thus been identified in a commercial PMUF resin and the chemical shifts of the methylene linkages are summarized in Figure 11. To identify the copolymer links by characteristic carbon chemical shift, the two cross-peaks labeled PMF1 and PMF2 were double selected and correlated to the adjacent carbon.…”

“…Phenol-melamine-formaldehyde (PMF) methylene co-polymer linkages were reported by Maciejewski et al 20 but the purpose of the study was to make precursors for dendritic macromolecules. In another study, the 13 C resonances of co-polymer methylene links were reported but these links were formed by reacting methylolphenols with an excess of melamine.…”