To obtain a better understanding of the breakdown of the crosslink between cotton cellulose and N-methylolethyleneurea compounds, it was desirable to identify the products of the acid hydrolysis of dimethylolethyleneurea (DMEU) and of fabric treated with DMEU. An approach to the identification of these hydrolysis products was made through a study of their nuclear magnetic resonance spectra. To interpret these spectra, an examination of spectra of some simpler urea derivatives was necessary. Evidence indicates that the products of miad acid hydrolysis of DMEU are unhydrolyzed DMEU, N-methylolethyleneurea, ethyleneurea and two polymeric forms of formaldehyde. The ethyleneurea ring was found to be stable to the hydrolysis conditions employed.
A technique for obtaining differential infrared absorption spectra of chemically modified cottons is described, and its value illustrated by selected examples. With KBr discs in a double-beam spectrophotometer, absorption bands common to unmodified and modified cottons can be reduced in intensity by placing equivalent quantities of cellulose in both beams The resulting spectrum facilitates identification of the molecular species introduced in making the derivative. The method is useful in obtaining spectra of the reaction products of cotton and intermolecular crosslinking agents at low degrees of addon Application of the method to cotton reacted with compounds of the dimethylol urea type and with other agents is described.
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