Nanocomposites and nanomaterials

Aqueous Dispersible modified montmorillonite for polymer/silicate nanocomposites from aqueous dispersions of polar polymers
Gonchar O.M.
Institute of Macromolecular Chemistry, NAS of Ukraine, Kharkovskoe shosse 48, 02160, Kyiv, Ukraine. 
E-mail: lexgon@ukr.net

Surface modification of MMT nanoparticles by chemical adsorption of organic cations has opened the opportunities for compatibility of silicate nanoparticles with polymer. The role of the modifier adsorbed on the MMT surface is decisive in the processes of interphase interaction, distribution of nanoparticles in the polymer matrix, the ability to exfoliate the nanofiller. Creating polymer nanocomposites based on specific types of polymers, it is extremely important to develop ways to modify the surface of inorganic particles that will lead to the most efficient realization of the nanofiller. In this work, modified montmorillonite functionalized with hydrophilic compounds was created, which forms aqueous dispersions and can be used to obtain nanocomposites from an aqueous medium based on water-dispersible polymers, in particular ionomeric polyurethanes. To functionalize the surface of montmorillonite with carboxylate fragments, we used the previously modified montmorillonite containing amino groups on its surface [1]. Pyromellitic acid dianhydride was used as a carboxylation agent. General scheme of the process:

1.	Gonchar O. Modification of the montmorillonite surface with oligourethane containing functional amino groups // Chem., phys. and techn. of surface. - 2019. - 10. - P. 87–93.