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6186140 
Journal Article 
An NMR study of the synthesis of benzoguanamine-formaldehyde resins 
Alekseyeva, SG; Arshava, BM; Bashta, NI; Matvelashvili, GS; Potseluyeva, NV; Romanov, NM; Slonim, IY 
1985 
Polymer Science USSR
ISSN: 0032-3950 
27 
12 
2843-2851 
A method of determining the composition of the reaction mixture during the synthesis of benzoguanamine-formaldehyde resins by using the 1H and 13C NMR spectra has been developed. The intensity of the signals in the 13C NMR spectra were used to determine the concentration of free benzoguanamine, of all the five possible methylbenzoguanamines (mono-s-di, a-di, tri- and tetra-), of the free formaldehyde, methylol groups, hemiformal and methylene bridges at secondary and tertiary nitrogen atoms. When the reaction between benzoguanamine and formaldehyde was carried out in a homogeneous medium (in solution in a mixture of DMSO and water), the replacement of one hydrogen atom in the amino group by a methylol group did not slow down the replacement of a second hydrogen atom.