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    Controlled Synthesis of Methacrylic Acid-Methyl Acrylate Copolymers and Their Properties at Various Interfaces

    Year: 2019

    Journal: Russ. J. Appl. Chem., Volume 92, JUN, page 775–786

    Authors: Zamyshlyayeva, O. G.; Ionychev, B. N.; Frolova, A. I.; Baten'kin, M. A.; Simonova, M. A.; Kopylova, N. A.; Zaitsev, S. D.; Semchikov, Yu. D.

    Organizations: Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [16-3350161-mol_nr, 19-03-00843]; Ministry of Education and Science of the Russian FederationMinistry of Education and Science, Russian Federation [4.1537.2014K]

    Keywords: controlled radical polymerization; gradient copolymer; random copolymer; Langmuir monolayers; Langmuir-Blodgett films

    Conditions were found for controlled reversible addition-fragmentation chain-transfer radical polymerization to obtain narrow-dispersity gradient methacrylic acid-methyl acrylate copolymer (M-n = 1.59 x 10(4)). A copolymer of similar composition and molecular mass (M-n = 1.81 x 10(4)) with random distribution of units was obtained by radical copolymerization in the presence of dodecyl mercaptan. The behavior of the gradient and random copolymers, each containing similar to 14 mol % methacrylic acid units, was studied in solutions, Langmuir monolayers, and Langmuir-Blodgett films. Several ranges of the existence of associates and micelles, preserved upon transfer in a Langmuir-Blodgett film, were revealed for the narrow-dispersity copolymer at the water-air interface depending on pH of the subphase. Associates in the form of ribbon structures and molecular ensembles of nanometric size (network structure with loop-like fragments) are observed in the AFM images of Langmuir-Blodgett films of the gradient and random copolymers, respectively.
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