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13 C‐NMR studies of commercial and partially self‐condensed hexakis(methoxymethyl)melamine (HMMM) resins
Author(s) -
Subrayan Ramachandran P.,
Jones Frank N.
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19961121)62:8<1237::aid-app14>3.0.co;2-4
Subject(s) - melamine , methylene , moiety , dept , melamine resin , chemistry , polymer chemistry , nuclear magnetic resonance spectroscopy , ether , cyanuric acid , carbon 13 nmr , organic chemistry , materials science , stereochemistry , coating
13 C‐nuclear magnetic resonance (NMR) spectroscopy was employed to study the linkages in three commercial fully methylocated melamine‐formaldehyde (HMMM) resins and their partially self‐condensed resins by acid catalysis, in order to probe the structures linking melamine units. Distortionless enhancement by polarization transfer (DEPT) experiments show that the partially self‐condensed resins contain both methylene ether and methylene linkages between melamine units. The extent of these linkages were estimated by quantitative 13 C‐NMR spectroscopy using inverse gated decoupling techniques. The results show that the ratios of methylene ether and methylene linkages to the triazine moiety vary from resin to resin. © 1996 John Wiley & Sons, Inc.