RADICAL POLYMERIZATION OF ACRYLAMIDE IN DIMETHYL SULFOXIDE-WATER MIXTURES.

**1H and **1**3C NMR spectra have been studied for acrylamide in dimethyl sulfoxide-water mixtures of various compositions. It has been shown that, as a consequence of the formation of a complex between acrylamide and water, increased water content in the mixture leads to downfield displacement of the **1**3C chemical shifts of the CH//2 equals and C equals 0 groups. A linear dependence has been found between the chemical shifts of carbon atoms in the groups mentioned and the water content of the solvent. Comparison of the data for complex formation between acrylamide and water together with the values of the velocity constant of propagation, which have been already determined, leads to the conclusion that the conformation of a polymer coil influences the polymerization of acrylamide in solution.