Nanocomposites and nanomaterials

Methods of creating of organoclay for obtaining polar polymer based exfoliated nanocomposites
Gonchar O.M.
Transfer Technology Department, Institute of Physics of the NAS of Ukraine. Kharkovskoe shosse 48, 02160, Kiev, Ukraine. 
E-mail: lexgon@ukr.net

In order to create organo-inorganic nanocomposites on the basis of polar heterochain polymers, in particular polyurethanes, methods of modification of MMT by polar reactive compounds were developed. For modification, organic ammonium cations containing both polar fragments (for the formation of physical bonds with a polymer matrix) and reactive groups were used.Modified by oligouretane compounds of MMT, in contrast to MMT-modified classical surfactants, can form strong physical and chemical bonds with a polymeric matrix [1, 2]. Modification is carried out by ion exchange of inorganic cations on the montmorillonite surface with organic.We used the natural montmorillonite of the Askania deposit (Georgia). Natural montmorillonite was transferred to the sodium form by treatment with sodium carbonate, to ensure the maximum exchange capacity of the mineral surface. The exchange capacity on the surface of montmorillonite sodium form was determined by analysis of the adsorption of the methylene blue by photocolorimetry. Intercalation of modifier into the interlayer space of MMT was confirmed by X-ray analysis. The content of organic component in the modified MMT (MMT/M) was determined by thermogravimetric analysis. The resulting organoclay is purposed for the formation of nanostructured composites based on cross-linked polyurethane acrylates, polyurethane and other polar polymers with improved physical and mechanical properties [3].

1.	Savelyev Yu., Gonchar А., Travinskaya Т. Montmorillonite Modified with Oligourethane Ammonium Chloride and Based Nanostructured Polymers // Amer. Journ. of Nanoscience and Nanotechn. – 2013. – 1(4).- P. 87–93.
2.	Savelyev Yu. V., Gonchar А.N., Travinskaya Т.V. New montmorillinite modifier for creation of polyurethane acrylate/organoclay nanocomposites by in situ polymerization // Journal of Chemical Engineering and Chemistry Research. – 2, №. 2, – P. 511–520.
3.	Gonchar O.M. Modification of the montmorillonite surface with oligourethane containing functional amino groups // Chemistry, physics and technology of surface. – 2019. – 10. – P. 87-93.