Influence of Various Factors on the Optical Absorption Coefficient of Aqueous Solutions of N-Vinylpyrrolidone and 2-Methyl-5-Vinylpyridine Copolymers

Aqueous solutions of three samples of N-vinylpyrrolidone and 2-methyl-5-vinylpyridine copolymers with different ratios of monomer units were studied by spectrophotometry. Concentration dependences of the solution optical density at 269 nm were obtained. Specific absorption coefficients of these solutions were calculated. Regions of pH and temperature with the most consistent determinations were found. The results could provide a basis for developing a quantitative determination method for N-vinylpyrrolidone and 2-methyl-5-vinylpyridine copolymers in aqueous solutions.