Nanocomposites and nanomaterials

Physicochemical properties of polymer-polymer nanocomposites based on polyaniline and water-soluble vinyl polymers
Dutka V.S., Kovalskyi Ya.P., Halechko H.M.
Ivan Franko Lviv National University, Kyrila & Mefoddia str., 6, Lviv-79005, Ukraine
e-mail: vdutka@ukr.net

Polymer-polymer composites (PPC) derivate of polyaniline and vinyl polymers have unique physical and chemical properties. Along with good forming properties these PPC have electrical conductivity which makes them perspective platforms for designing various sensors devices. In this paper, we received and studied the physicochemical properties of PPC, derived from polyvinyl alcohol (PVA) and polymethacrylic acid (PMA) and polyaniline (PANI). Composites with different content of components were obtained by mechanic-chemical method, mixing in a small amount of water PVA or PMA with PANI.
We studied the electrical conductivity of obtained PPC. Increasing the number of PANI content in the composite leads to increase of its electrical conductivity. We have studied temperature dependence of electrical conductivity, which allowed finding the activation energy of charge transfer.
The thermomechanical properties of PVA and PANI composites have been studied. The interaction between PVA and PANI macromolecules is noted. With increasing content of PANI in the composite leads to a decrease in the glass transition temperature of the composite. Thermomechanical curves of composites are much more complex than the corresponding PVA curves. Conducted radiographic studies confirm the intermolecular interaction in the obtained composites. Intermolecular hydrogen bonds are formed between PVA and PANI macromolecules.
Quantum chemical calculations of the optimal geometric structure and electronic properties of PANI and electrically conductive polymer composites made of PVA and PMA were performed. It is shown that PANI macromolecules can have different conformations. The calculation of partial charges on nitrogen atoms in the PANI macromolecule indicates the possibility of the formation of hydrogen bonds between macromolecules of different nature.