2019 (1) 2

https://doi.org/10.15407/polymerj.41.01.019

Effect of surface nature of nanofiller on the in situ formation and morphology of a poly(methyl methacrylate)/polyurethane blend

V.F. Shumsky, L.F. Kosyanchuk, T.D. Ignatova, I.P. Getmanchuk, O.I. Antonenko, L.O. Vorontsova, O.O. Brovko

Institute of Macromolecular Chemistry of NAS of Ukraine

48, Kharkivske shause, Kyiv, 02160, Ukraine

Polym. J., 2019, 41, no. 1: 19-25

Section: Structure and properties.

Language: Ukrainian.

Abstract:

Creation of the multicomponent systems based on the polymer mixtures, semi- and fool interpenetrating polymer networks at combining of rigid and flexible components by the method of in situ mixing is the perspective way of formation of polymer composite materials with properties changing from reinforced elastomers up to impact-resistant plastics. Introduction of fillers which are compatibilizers into such systems on the stage of forming facilitates dispersion of one phase in other and stabilizes morphology of mixture. Nature of surface of filler has considerable influence on these processes. The aim of this research was to determine an influence of surface nature of nanofiller (aerosil) on the process of formation (kinetics and rheokinetics) and morphology of a linear poly(methyl methacrylate) – cross-linked polyurethane blend. For this purpose isothermal calorimetry, rheokinetic measuring and optical microscopy were used as research methods. It was shown that the introduction of hydrophobic aerosil into the reaction mixture leads to a decrease in the rate of both urethane formation and polymerization of methyl methacrylate as compared to those using hydrophilic (unmodified) aerosil. For the mixture filled with hydrophobic aerosil, the rheokinetic curves of h(t) dependences have the traditional extreme form that is characteristic of systems in which phase separation occurs. In contrast, for the mixture filled with hydrophilic aerosil, the extremum in the h(t) dependence is absent, which may be due to the “forced” compatibility between the components of the mixture in the presence of such a nanofiller. The results obtained are consistent with the morphology of the studied systems.

Key words: nanofillers, hydrophobization, viscosity, degree of conversion, polymer blends, phase separation.

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