2019 (4) 1

The structure of hydrophobic aerosil in a hydrocarbon medium. The effect of shear field

I.P. Getmanchuk, V.V. Davidenko, V.F. Shumsky

Institute of Macromolecular Chemistry NAS of Ukraine

48, Kharkivske shose, Kyiv, 02160, Ukraine

Polym. J., 2019, 41, no. 4: 219-229.

Section: Structure and properties.

Language: Russian.

Abstract:

Based on the review of micelle formation, concepts of structure formation in deformable single-component and multicomponent polymer and colloid systems, as well as experimental data on the rheology of dispersions of hydrophobic aerosil (Am) in a low-molecular-weight hydrocarbon medium, the use of a “micellar” mechanism for the formation of a bulk structure is considered. A model of such a structure is proposed before, during and after shear deformation, which allows interpretation of experimental data on the rheology of dispersed systems.It is shown that during the reaction formation of the PMMA – PU – Am composition, the conditions of shear deformation of the system correspond to those for which self-organization and fixation of the coagulation rheopexy structure of the nanofiller in the PMMA – PU binary matrix is   possible at the moment it reaches very high viscosity diffusion processes will almost be “frozen”. Two concentration regions of aerosil Am are predicted (before and after the percolation threshold), where we can expect an increase in the mechanical characteristics of the impact-resistant PMMA.

Key words: micelle, hydrophobic aerosil, suspension, rheopexy, yield stress, percolation threshold.

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