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As part of our systematic study on the curing reaction of novolac resins with hexamethylenetetramine (HMTA), the reactions between 2,6-xylenol (a model phenol) and HMTA, and the thermal decomposition of their first-formed products bis- and tris(4-hydroxy-3,5-dimethylbenzyl)amines have been studied by 13 C and 15 N n.m.r. spectroscopy. The thermal decomposition of bis- and tris(4-hydroxy-3,5-dimethylbenzyl)amines...
The reactions of 2,4-xylenol and 2,6-xylenol, with bis- and tris(4-hydroxy-3,5-dimethylbenzyl)amines derived from the reaction of 2,6-xylenol with hexamethylenetetramine (HMTA) were studied as models for the curing of novolac resins. The structural changes during the process were examined by 13 C and 15 N n.m.r. spectroscopy. The results indicate that reactions between bis- and tris(4-hydroxy-3,5-dimethylbenzyl)amines...
As part of our study on the curing reactions between novolac resins and hexamethylenetetramine (HMTA), a model benzoxazine, 3-(3,5-dimethyl-2-hydroxybenzyl)-6,8-dimethyl-3,4-dihydro-(2H)-1,3-benzoxazine, was heated under carefully controlled conditions, and the structural changes were studied by 13C and 15N n.m.r. spectroscopy. The benzoxazine structure is relatively stable, and detectable decomposition...
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