Solid state two-dimensional NMR studies of polymeric diphenylmethane diisocyanate (PMDI) reaction in wood

N15-H1 heteronuclear correlation (HETCOR) NMR experiments were employed to study the products from the reaction of N15 enriched polymeric diphenylmethane diisocyanate (PMDI) with cellulose, lignin, water, and aspen and southern yellowpine wood samples. Both urea and biuret structures can be clearly...

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Veröffentlicht in:	Forest products journal 2003-06, Vol.53 (6), p.63-71
Hauptverfasser:	Bao, Shanci, Daunch, William A, Sun, Yahong, Rinaldi, Peter L, Marcinko, Joseph J, Phanopoulos, Chris
Format:	Artikel
Sprache:	eng
Schlagworte:	Adhesives Applied sciences biuret Cellulose Chemical properties Chemical reactions Evolution Exact sciences and technology Forest products industry Fourier transforms Laboratories Lignin Manufacturing Mathematical models nuclear magnetic resonance spectroscopy Polymer industry, paints, wood Polymeric composites Protons reaction wood Studies urea Wood Wood composites Wood-based materials Wood. Paper. Non wovens
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Zusammenfassung:	N15-H1 heteronuclear correlation (HETCOR) NMR experiments were employed to study the products from the reaction of N15 enriched polymeric diphenylmethane diisocyanate (PMDI) with cellulose, lignin, water, and aspen and southern yellowpine wood samples. Both urea and biuret structures can be clearly recognized in the wood/PMDI composites.Two peaks around 104 to 106 ppm result from different chemical environments of urea structures.
ISSN:	0015-7473 2376-9637