№2 (2017) 8

https://doi.org/10.15407/polymerj.39.02.122

The influence of the molecular structure of copolymers Dextran-poly-N-isopropylacrylamide on conformational transition characteristics

V.A. Chumachenko, N.V. Kutsevol, Yu.I. Harahuts, V.A. Ryzhko, N.P. Melnyk

Taras Shevchenko National University of Kyiv, Department of Chemistry

60, Volodymyrska str., Kyiv, 010601, Ukraine

Polym. J., 2017, 39, № 2: 122-128.

Section: Synthesis polymers.

Language: Ukrainian.

Abstract:

Radical copolymerization method was used for the synthesis of the star-like copolymers with dextran core of various molecular weights and with various amount of grafted poly-N-isopropylacrylamide chains (D-PNIPAM). These polymers have been characterized self-exclusion chromatography and NMR-spectroscopy. It was shown by Dynamic Light Scattering method that LCST as well as conformational transition characteristics affect the molecular structure of the branched macromolecule D-PNIPAM, namely, the distance between grafts. It was found that the inflexibility of the macromolecules of copolymers D-PNIPAM determined by the distance between grafts. By reducing the distance between the chain grafts PNIPAM change conformation from mushroomlike to wormlike. Hydrodynamic size of D-PNIPAM macromolecule deceases more significally at conformational “coil-globule” transition for copolymers with mushroom conformation of grafted chains.

Key words: copolymers, poly-N-isopropylacrylamide, dextran, LCST, mushroom conformation.

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