Abstract
An investigation has been made of the laws governing the intramolecular anhydrization of an MMA-methacrylic acid copolymer under the action of acetic anhydride in a sulpholane medium in the temperature range 160–185°C. IR spectroscopy and 13C nuclear magnetic resonance have been used to study the composition and structure of the anhydride copolymer and it has been shown that cyclization of the initial copolymer leads to the formation of six-membered rings of the glutaric anhydride type in the macromolecules.
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