Abstract
AbstractUV absorption spectra of styrene‐methacrylic acid and styrene‐acrylic acid copolymers prepared in benzene solution and in emulsion were investigated. They were compared to UV spectra of derived copolymers prepared by methylation of the carboxyl groups of the parent copolymers. In the spectra of the methylated copolymers only a hypochromic effect on all peaks was observed, whereas in the spectra of the parent acid copolymers hypochromic as well as hyperchromic effects were found. They depend on the kind of acid, its content in the copolymer and on the type of the copolymer. These differences may be explained on the basis of hydrogen bonds formed between the π‐electrons of phenyl rings and carboxyl groups. It seems that the most sensitive peak to these hydrogen bonds is that at 259 nm, while the peak at 269 nm is sensitive to electronic interactions between adjacent monomeric units.
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