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Microstructure of styrene‐methacrylic acid and styrene‐acrylic acid copolymers, 4. 1H NMR study of phenyl rings in methylated styrenemethacrylic acid and styrene‐acrylic acid copolymers

Maria S̀witała, ZBIGNIEW WOJTCZAK

Abstract

Abstract The sequence distribution in methacrylic acid‐styrene and acrylic acid‐styrene copolymers of various composition prepared in benzene and emusion were studied by using the aromatic proton region in the 1H NMR spectra of methylated copolymers. A digital computer was used to resolve overlapping peaks, and one Lorentzian and two Gaussian curves were fitted for their approximation. The study of random copolymers shows that styrene sequences as small as two and three units are contained. The run numbers and number‐average sequence lengths of styrene calculated for emulsion methacrylic acid‐styrene and acrylic acid‐styrene copolymers show that these copolymers do not have long sequences of styrene units.

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Key concepts: Styrene, Copolymer, Methacrylic acid, Acrylic acid, Polymer chemistry, Materials science, Benzene, Chemistry