Characterisation of some melamine-formaldehyde condensates and some cured resins by1H,13C and15N n.m.r. spectroscopy
作者： John R. Ebdon , Barry J. Hunt , William T. S. O'Rourke , John Parkin
关键词: Trimer 、 Melamine 、 Magic angle 、 Chemistry 、 Ether 、 Organic chemistry 、 Formaldehyde 、 Methylene 、 Melamine resin 、 Oligomer 、 General Engineering 、 General Materials Science
摘要: Some oligomeric species (condensates) in a melamine-formaldehyde adduct mixture have been isolated by preparative high performance liquid chromatography (h.p.l.c.) and partly identified field 1H 13C nuclear magnetic resonance (n.m.r.) spectroscopy. The oligomers are shown most likely to be largely dimers, trimers tetramers contain both methylene ether linkages. cured resins solid-state cross-polarisation magic angle sample spinning (c.p./m.a.s.) 15N n.m.r. linear branched linkages but few free methylol groups. relative proportions of the various appear controlled mainly melamine: formaldehyde ratio.
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