The effect of formaldehyde concentration in its water solution on the chemical composition of toluene-formaldehyde resins
The effect of formaldehyde concentration in its water
solution on the chemical composition of toluene-formaldehyde resins
The effect of the concentration of formaldehyde in its aqueous solution on the structure of resins prepared by its condensation with toluene in a continuous or semi-continuous process has been investigated. The structure of toluene-formaldehyde resins has been determined by the NMR method. It has been found that in the case of low concentrations of formaldehyde, when it is present in the form of methylene glycol, resins are obtained which do not contain acetal bonds. At higher concentrations, favorable to the oligomerization of glycol, acetal-type compounds prevail in the products of condensation.
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