2019 (4) 2

Effect of modified aerosil on the formation process, viscoelastic and mechanical properties of polymer matrices based on PMMA/PU IPNs

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

Institute of Macromolecular Chemistry NAS of Ukraine

48, Kharkivske shose, Kyiv, 02160, Ukraine

Polym. J., 2019, 41, no. 4: 230-239.

Section: Structure and properties.

Language: Ukrainian.

Abstract:

The influence of modified hydrophobic aerosil on the formation, viscoelastic and mechanical properties of interpenetrating polymer networks (IPNs) of poly(methyl methacrylate)/polyurethane has been investigated. It was established that the introduction of a nanofiller directly into the reaction mixture and an increase in its concentration causes the slowdown of both reactions: polymerization and urethane formation. The process of phase separation that accompanies chemical reactions takes place in two stages. The nucleation mechanism is preferred at the first stage; the spinodal mechanism is preferred at the second one. The formation of the phase-separated morphology of the obtained structure is confirmed by the results of optical microscopy: at the nanofiller concentration of 1 % (by weight) interconnected periodic structures are formed, and at the concentration of 7 % (by weight) structures with non-uniform distribution of phases are formed. The established relationship between the values of impact strength and the mechanical loss modulus indicates a possible location of the nanofiller mainly in the interfacial region. It has been shown that IPN with 1 % (by weight) of hydrophobic aerosil has the best value of impact strength. It is assumed that the impact strength for the filled IPNs is determined by the coagulation structures formed by the aerosil nanoparticles.

Key words: interpenetrating polymer networks, nanofiller, hydrophobic aerosol, interfacial region, phase separation, morphology.

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