SELF-ORGANIZATION IN AQUEOUS SOLUTIONS OF HYDROXYPROPYLCELLULOSE AND NONIONIC SURFACTANT TWEEN 80тезисы доклада

Дата последнего поиска статьи во внешних источниках: 26 марта 2018 г.

Работа с тезисами доклада


[1] Poteshnova M. V., Zadymova N. M. Self-organization in aqueous solutions of hydroxypropylcellulose and nonionic surfactant tween 80 // VIII International Symposiun "Design and Synthesis of Supramolecular Architectires Program & Abstracts. — Kazan, 2016. — P. 190–190. SELF-ORGANIZATION IN AQUEOUS SOLUTIONS OF HYDROXYPROPYLCELLULOSE AND NONIONIC SURFACTANT TWEEN 80 Poteshnova M.V., Zadymova N.M. M.V. Lomonosov Moscow State University, Russia poteshnova@colloid.chem.msu.ru This work is devoted to studying interaction between hydroxypropylcellulose and Tween 80 in aqueous solutions. Hydroxypropylcellulose (HPC, M.w. = 80 kDa) is nonionic water soluble polymer having surface activity, aqueous thickening and stabilizing properties of dispersed systems. Polyethoxylated (20) sorbitan monooleate (Tween 80 (Tw)) is nontoxic, biodegradable, nonionic surfactant. Aqueous solutions of individual components (HPC, Tw) and their mixtures at the constant ratio Tw and HPC (one Tw molecule per one monomer unit of HPC) in wide range of molar concentration (C) were investigated by tensiometry, viscometry and dynamic light scattering at ºC. Equilibrium isotherm lnC) for mixture Tw with HPC was shifted to the range of lower concentrations in comparison with HPC. Synergistic decreasing of steady-state surface tension values were observed for the Tw-HPC mixture compared with the individual components at low concentrations of HPC. The value of intrinsic viscosity for Tw-HPC mixture was lower than for HPC that points out on more compact conformation of the macromolecules in mixture at infinity polymer dilution. Huggins coefficient characterizing pair interactions of macromolecules was higher for Tw-HPC mixture than for HPC. The particle size distributions for HPC and Tw-HPC mixture were bimodal: sizes of bigger particles were approximately the same (400 - 600 nm), but sizes of smaller particles were different (∼ 20 and ∼ 9 nm for HPC and Tw-HPC correspondingly). Decreasing of smaller particles sizes seems to be a result of changing of polymer molecules conformation due to polymer hydrophobization. Received results confirm self-organization in Tw-HPC binary aqueous solutions due to hydrogen bonding between polyoxyethylene chains of surfactant and hydroxyl groups of HPC. The work is supported by RFBR grant № 15-08-04546a.

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