Abstract
The two-stage method for poly(methyl acrylate) grafting starch using triethylborane and 1,4-benzoquinone has been developed. The first stage was borylation of alcohol groups of starch. The second stage was polymerization of methyl acrylate in the inhibitor - 1,4-benzoquinone - presence accompanied by the S H 2-substitution at the boron atom. The advantages of developed method were the homogeneity of the process, the high yield of graft-copolymer, the possibility to control of chain length of synthetic polymer, and the absence of homopolymer in the final product. The molecular weight characteristics of starch-graft-poly(methyl acrylate) copolymer was determined by gel-permeation chromatography. The evidence of the graft-copolymer formation was 11B nuclear magnetic resonance data and its glass-transition temperature. The resulting graft-copolymer has an amphiphilic nature and a high thermal stability compared to the corresponding homopolymers (starch and poly(methyl acrylate)). According to the calculated values of the surface Gibbs energy the surface of starch-graft-poly(methyl acrylate) films is characterized as a high-energy surface.
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The study was financially supported by the Ministry of Education and Science of the Russian Federation (project No. 4.5706.2017/BCh).
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Ludin, D.V., Zaitsev, S.D., Kuznetsova, Y.L. et al. Starch-graft-poly(methyl acrylate) copolymer: the new approach to synthesis and copolymer characterization. J Polym Res 24, 117 (2017). https://doi.org/10.1007/s10965-017-1280-x
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DOI: https://doi.org/10.1007/s10965-017-1280-x